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• linux thread synchronization

  - by johnnycrash

  I am new to linux and linux threads. I have spent some time googling to try to understand the differences between all the functions available for thread synchronization. I still have some questions. I have found all of these different types of synchronizations, each with a number of functions for locking, unlocking, testing the lock, etc. gcc atomic operations futexes mutexes spinlocks seqlocks rculocks conditions semaphores My current (but probably flawed) understanding is this: semaphores are process wide, involve the filesystem (virtually I assume), and are probably the slowest. Futexes might be the base locking mechanism used by mutexes, spinlocks, seqlocks, and rculocks. Futexes might be faster than the locking mechanisms that are based on them. Spinlocks dont block and thus avoid context swtiches. However they avoid the context switch at the expense of consuming all the cycles on a CPU until the lock is released (spinning). They should only should be used on multi processor systems for obvious reasons. Never sleep in a spinlock. The seq lock just tells you when you finished your work if a writer changed the data the work was based on. You have to go back and repeat the work in this case. Atomic operations are the fastest synch call, and probably are used in all the above locking mechanisms. You do not want to use atomic operations on all the fields in your shared data. You want to use a lock (mutex, futex, spin, seq, rcu) or a single atomic opertation on a lock flag when you are accessing multiple data fields. My questions go like this: Am I right so far with my assumptions? Does anyone know the cpu cycle cost of the various options? I am adding parallelism to the app so we can get better wall time response at the expense of running fewer app instances per box. Performances is the utmost consideration. I don't want to consume cpu with context switching, spinning, or lots of extra cpu cycles to read and write shared memory. I am absolutely concerned with number of cpu cycles consumed. Which (if any) of the locks prevent interruption of a thread by the scheduler or interrupt...or am I just an idiot and all synchonization mechanisms do this. What kinds of interruption are prevented? Can I block all threads or threads just on the locking thread's CPU? This question stems from my fear of interrupting a thread holding a lock for a very commonly used function. I expect that the scheduler might schedule any number of other workers who will likely run into this function and then block because it was locked. A lot of context switching would be wasted until the thread with the lock gets rescheduled and finishes. I can re-write this function to minimize lock time, but still it is so commonly called I would like to use a lock that prevents interruption...across all processors. I am writing user code...so I get software interrupts, not hardware ones...right? I should stay away from any functions (spin/seq locks) that have the word "irq" in them. Which locks are for writing kernel or driver code and which are meant for user mode? Does anyone think using an atomic operation to have multiple threads move through a linked list is nuts? I am thinking to atomicly change the current item pointer to the next item in the list. If the attempt works, then the thread can safely use the data the current item pointed to before it was moved. Other threads would now be moved along the list. futexes? Any reason to use them instead of mutexes? Is there a better way than using a condition to sleep a thread when there is no work? When using gcc atomic ops, specifically the test_and_set, can I get a performance increase by doing a non atomic test first and then using test_and_set to confirm? *I know this will be case specific, so here is the case. There is a large collection of work items, say thousands. Each work item has a flag that is initialized to 0. When a thread has exclusive access to the work item, the flag will be one. There will be lots of worker threads. Any time a thread is looking for work, they can non atomicly test for 1. If they read a 1, we know for certain that the work is unavailable. If they read a zero, they need to perform the atomic test_and_set to confirm. So if the atomic test_and_set is 500 cpu cycles because it is disabling pipelining, causes cpu's to communicate and L2 caches to flush/fill .... and a simple test is 1 cycle .... then as long as I had a better ratio of 500 to 1 when it came to stumbling upon already completed work items....this would be a win.* I hope to use mutexes or spinlocks to sparilngly protect sections of code that I want only one thread on the SYSTEM (not jsut the CPU) to access at a time. I hope to sparingly use gcc atomic ops to select work and minimize use of mutexes and spinlocks. For instance: a flag in a work item can be checked to see if a thread has worked it (0=no, 1=yes or in progress). A simple test_and_set tells the thread if it has work or needs to move on. I hope to use conditions to wake up threads when there is work. Thanks!

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• Android FTP seek Bar issue

  - by Androi Developer

  I am trying to Upload & Download file to server using FTP and Download File using HTTP i am able to do this, my problem is when i am trying to show seek bar with Upload status of file using ftp then it's not showing. In this attached image Using HTTP it's showing seekbar with Network spped like this i need to display seek bar & Network sppeed in FTP. Below code i wrote for FTP to upload file into server. Code:-- // Upload System.out.println("upload test is called"); //Toast.makeText(con, "upload FTP test is called", Toast.LENGTH_SHORT).show(); //ContextWrapper context = null; //assetManager= context.getAssets(); assetManager = getResources().getAssets(); input1 = assetManager.open("hello.txt"); final long started = System.currentTimeMillis(); int size = input1.available(); //byte[] buffer = new byte[size]; byte dataByte[] = new byte[1024]; //input1.read(buffer); //String data = "ZK DATA TESTER TEST DATA1sdfsdf"; String data = input1.toString(); System.out.println("dat value is........"+data); final int lenghtOfFile = data.getBytes().length; //final int lenghtOfFile = input1.getBytes().length; System.out.println("length of file....."+lenghtOfFile); ByteArrayInputStream in = new ByteArrayInputStream( data.getBytes()); //toast("Uploading /test.txt"); //Toast.makeText(con,"File Size : " +data.getBytes().length + " bytes",Toast.LENGTH_SHORT).show(); //byte b[] = new byte[1024]; long total = 0; long sleepingTime= 0; System.out.println("started time --"+started); updateUI(status, "Uploading"); while ((count = in.read(dataByte)) != -1) { System.out.println("read value is...."+in.read(dataByte)); while (sleep1) { Thread.sleep(1000); System.out.println("ftp upload is in sleeping mode"); sleepingTime +=1000; } System.out.println("Total count --"+count); total += count; System.out.println("Only Total --"+total); final int progress = (int) ((total * 100) / lenghtOfFile); final long speed = total; //duration = ((System.currentTimeMillis() - started)-sleepingTime) / 1000; boolean result = ObjFtpCon.storeFile("/test.txt", input1); //boolean result = ObjFtpCon.storeFile(map.get("file_address").toString()+"/test.txt", input1); duration = ((System.currentTimeMillis() - started)-sleepingTime) / 1000; /* runOnUiThread(new Runnable() { public void run() { bar.setProgress(progress); // trans.setText("" + progress); //duration = ((System.currentTimeMillis() - started)-sleepingTime) / 1000; //duration = ((System.currentTimeMillis() - started)-sleepingTime) / 1000; //real_time.setText(duration + " secs"); if (duration != 0) { test_avg.setText((((speed / duration)*1000)*0.0078125) + " kbps"); if (pk <= (speed / duration) / 1024) { pk = (speed / duration) / 1024; } if (pk <= ((speed / duration)*1000)*0.0078125) { pk = (long)(((speed / duration)*1000)*0.0078125); } //peak.setText(pk + " kbps"); } } });*/ //in.close(); if (result) { updateUI(status, "Uploaded"); // toast("Uploading succeeded"); // toast("Uploaded at /test.txt"); //duration = ((System.currentTimeMillis() - started)-sleepingTime) / 1000; System.out.println("curreent time..... "+System.currentTimeMillis()); System.out.println("started time --"+started); System.out.println("sleep tome...."+sleepingTime); System.out.println("duration is....."+duration); runOnUiThread(new Runnable() { public void run() { bar.setProgress(progress); // trans.setText("" + progress); //duration = ((System.currentTimeMillis() - started)-sleepingTime) / 1000; real_time.setText(duration + " secs"); if (duration != 0) { test_avg.setText((speed / duration) / 1024 + " kbps"); if (pk <= (speed / duration) / 1024) { pk = (speed / duration) / 1024; } peak.setText(pk + " kbps"); } } }); } /*while(!result){Thread.sleep(1000);}*/ } in.close();

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• Installing Lubuntu 14.04.1 forcepae fails

  - by Rantanplan

  I tried to install Lubuntu 14.04.1 from a CD. First, I chose Try Lubuntu without installing which gave: ERROR: PAE is disabled on this Pentium M (PAE can potentially be enabled with kernel parameter "forcepae" ... Following the description on https://help.ubuntu.com/community/PAE, I used forcepae and tried Try Lubuntu without installing again. That worked fine. dmesg | grep -i pae showed: [ 0.000000] Kernel command line: file=/cdrom/preseed/lubuntu.seed boot=casper initrd=/casper/initrd.lz quiet splash -- forcepae [ 0.008118] PAE forced! On the live-CD session, I tried installing Lubuntu double clicking on the install button on the desktop. Here, the CD starts running but then stops running and nothing happens. Next, I rebooted and tried installing Lubuntu directly from the boot menu screen using forcepae again. After a while, I receive the following error message: The installer encountered an unrecoverable error. A desktop session will now be run so that you may investigate the problem or try installing again. Hitting Enter brings me to the desktop. For what errors should I search? And how? Finally, I rebooted once more and tried Check disc for defects with forcepae option; no errors have been found. Now, I am wondering how to find the error or whether it would be better to follow advice c in https://help.ubuntu.com/community/PAE: "Move the hard disk to a computer on which the processor has PAE capability and PAE flag (that is, almost everything else than a Banias). Install the system as usual but don't add restricted drivers. After the install move the disk back." Thanks for some hints! Perhaps some of the following can help: On Lubuntu 12.04: cat /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 13 model name : Intel(R) Pentium(R) M processor 1.50GHz stepping : 6 microcode : 0x17 cpu MHz : 600.000 cache size : 2048 KB fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 2 wp : yes flags : fpu vme de pse tsc msr mce cx8 mtrr pge mca cmov clflush dts acpi mmx fxsr sse sse2 ss tm pbe up bts est tm2 bogomips : 1284.76 clflush size : 64 cache_alignment : 64 address sizes : 32 bits physical, 32 bits virtual power management: uname -a Linux humboldt 3.2.0-67-generic #101-Ubuntu SMP Tue Jul 15 17:45:51 UTC 2014 i686 i686 i386 GNU/Linux lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 12.04.5 LTS Release: 12.04 Codename: precise cpuid eax in eax ebx ecx edx 00000000 00000002 756e6547 6c65746e 49656e69 00000001 000006d6 00000816 00000180 afe9f9bf 00000002 02b3b001 000000f0 00000000 2c04307d 80000000 80000004 00000000 00000000 00000000 80000001 00000000 00000000 00000000 00000000 80000002 20202020 20202020 65746e49 2952286c 80000003 6e655020 6d756974 20295228 7270204d 80000004 7365636f 20726f73 30352e31 007a4847 Vendor ID: "GenuineIntel"; CPUID level 2 Intel-specific functions: Version 000006d6: Type 0 - Original OEM Family 6 - Pentium Pro Model 13 - Stepping 6 Reserved 0 Brand index: 22 [not in table] Extended brand string: " Intel(R) Pentium(R) M processor 1.50GHz" CLFLUSH instruction cache line size: 8 Feature flags afe9f9bf: FPU Floating Point Unit VME Virtual 8086 Mode Enhancements DE Debugging Extensions PSE Page Size Extensions TSC Time Stamp Counter MSR Model Specific Registers MCE Machine Check Exception CX8 COMPXCHG8B Instruction SEP Fast System Call MTRR Memory Type Range Registers PGE PTE Global Flag MCA Machine Check Architecture CMOV Conditional Move and Compare Instructions FGPAT Page Attribute Table CLFSH CFLUSH instruction DS Debug store ACPI Thermal Monitor and Clock Ctrl MMX MMX instruction set FXSR Fast FP/MMX Streaming SIMD Extensions save/restore SSE Streaming SIMD Extensions instruction set SSE2 SSE2 extensions SS Self Snoop TM Thermal monitor 31 reserved TLB and cache info: b0: unknown TLB/cache descriptor b3: unknown TLB/cache descriptor 02: Instruction TLB: 4MB pages, 4-way set assoc, 2 entries f0: unknown TLB/cache descriptor 7d: unknown TLB/cache descriptor 30: unknown TLB/cache descriptor 04: Data TLB: 4MB pages, 4-way set assoc, 8 entries 2c: unknown TLB/cache descriptor On Lubuntu 14.04.1 live-CD with forcepae: cat /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 13 model name : Intel(R) Pentium(R) M processor 1.50GHz stepping : 6 microcode : 0x17 cpu MHz : 600.000 cache size : 2048 KB physical id : 0 siblings : 1 core id : 0 cpu cores : 1 apicid : 0 initial apicid : 0 fdiv_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 2 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov clflush dts acpi mmx fxsr sse sse2 ss tm pbe bts est tm2 bogomips : 1284.68 clflush size : 64 cache_alignment : 64 address sizes : 36 bits physical, 32 bits virtual power management: uname -a Linux lubuntu 3.13.0-32-generic #57-Ubuntu SMP Tue Jul 15 03:51:12 UTC 2014 i686 i686 i686 GNU/Linux lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 14.04.1 LTS Release: 14.04 Codename: trusty cpuid CPU 0: vendor_id = "GenuineIntel" version information (1/eax): processor type = primary processor (0) family = Intel Pentium Pro/II/III/Celeron/Core/Core 2/Atom, AMD Athlon/Duron, Cyrix M2, VIA C3 (6) model = 0xd (13) stepping id = 0x6 (6) extended family = 0x0 (0) extended model = 0x0 (0) (simple synth) = Intel Pentium M (Dothan B1) / Celeron M (Dothan B1), 90nm miscellaneous (1/ebx): process local APIC physical ID = 0x0 (0) cpu count = 0x0 (0) CLFLUSH line size = 0x8 (8) brand index = 0x16 (22) brand id = 0x16 (22): Intel Pentium M, .13um feature information (1/edx): x87 FPU on chip = true virtual-8086 mode enhancement = true debugging extensions = true page size extensions = true time stamp counter = true RDMSR and WRMSR support = true physical address extensions = false machine check exception = true CMPXCHG8B inst. = true APIC on chip = false SYSENTER and SYSEXIT = true memory type range registers = true PTE global bit = true machine check architecture = true conditional move/compare instruction = true page attribute table = true page size extension = false processor serial number = false CLFLUSH instruction = true debug store = true thermal monitor and clock ctrl = true MMX Technology = true FXSAVE/FXRSTOR = true SSE extensions = true SSE2 extensions = true self snoop = true hyper-threading / multi-core supported = false therm. monitor = true IA64 = false pending break event = true feature information (1/ecx): PNI/SSE3: Prescott New Instructions = false PCLMULDQ instruction = false 64-bit debug store = false MONITOR/MWAIT = false CPL-qualified debug store = false VMX: virtual machine extensions = false SMX: safer mode extensions = false Enhanced Intel SpeedStep Technology = true thermal monitor 2 = true SSSE3 extensions = false context ID: adaptive or shared L1 data = false FMA instruction = false CMPXCHG16B instruction = false xTPR disable = false perfmon and debug = false process context identifiers = false direct cache access = false SSE4.1 extensions = false SSE4.2 extensions = false extended xAPIC support = false MOVBE instruction = false POPCNT instruction = false time stamp counter deadline = false AES instruction = false XSAVE/XSTOR states = false OS-enabled XSAVE/XSTOR = false AVX: advanced vector extensions = false F16C half-precision convert instruction = false RDRAND instruction = false hypervisor guest status = false cache and TLB information (2): 0xb0: instruction TLB: 4K, 4-way, 128 entries 0xb3: data TLB: 4K, 4-way, 128 entries 0x02: instruction TLB: 4M pages, 4-way, 2 entries 0xf0: 64 byte prefetching 0x7d: L2 cache: 2M, 8-way, sectored, 64 byte lines 0x30: L1 cache: 32K, 8-way, 64 byte lines 0x04: data TLB: 4M pages, 4-way, 8 entries 0x2c: L1 data cache: 32K, 8-way, 64 byte lines extended feature flags (0x80000001/edx): SYSCALL and SYSRET instructions = false execution disable = false 1-GB large page support = false RDTSCP = false 64-bit extensions technology available = false Intel feature flags (0x80000001/ecx): LAHF/SAHF supported in 64-bit mode = false LZCNT advanced bit manipulation = false 3DNow! PREFETCH/PREFETCHW instructions = false brand = " Intel(R) Pentium(R) M processor 1.50GHz" (multi-processing synth): none (multi-processing method): Intel leaf 1 (synth) = Intel Pentium M (Dothan B1), 90nm

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• usb mouse/keyboard doesn't work with 3.11.0-12-generic kernel

  - by x-yuri

  I can't use my usb keyboard/mouse after upgrade from raring to saucy. The keyboard works in grub menu and if I boot with the previous kernel version (3.8.0-31-generic). My new kernel version is 3.11.0-12-generic. I've got Mad Catz R.A.T.7 wired USB mouse, Canyon CNL-MBMSO02 wired usb mouse and Logitech diNovo Edge wireless keyboard, connected to computer through Logitech Unifying Receiver. Using PS/2 keyboard I've managed to get some information. dmesg says: [ 0.166273] ACPI: bus type USB registered [ 0.166273] usbcore: registered new interface driver usbfs [ 0.166273] usbcore: registered new interface driver hub [ 0.166273] usbcore: registered new device driver usb ... [ 3.534226] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver [ 3.534228] ehci-pci: EHCI PCI platform driver [ 3.534291] ehci-pci 0000:00:1a.7: setting latency timer to 64 [ 3.534299] ehci-pci 0000:00:1a.7: EHCI Host Controller [ 3.534304] ehci-pci 0000:00:1a.7: new USB bus registered, assigned bus number 1 [ 3.534315] ehci-pci 0000:00:1a.7: debug port 1 [ 3.538218] ehci-pci 0000:00:1a.7: cache line size of 64 is not supported [ 3.538231] ehci-pci 0000:00:1a.7: irq 18, io mem 0xd3325400 [ 3.548017] ehci-pci 0000:00:1a.7: USB 2.0 started, EHCI 1.00 [ 3.548042] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002 [ 3.548045] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1 [ 3.548048] usb usb1: Product: EHCI Host Controller [ 3.548050] usb usb1: Manufacturer: Linux 3.11.0-12-generic ehci_hcd [ 3.548053] usb usb1: SerialNumber: 0000:00:1a.7 [ 3.548155] hub 1-0:1.0: USB hub found [ 3.548159] hub 1-0:1.0: 6 ports detected [ 3.548311] ehci-pci 0000:00:1d.7: setting latency timer to 64 [ 3.548319] ehci-pci 0000:00:1d.7: EHCI Host Controller [ 3.548323] ehci-pci 0000:00:1d.7: new USB bus registered, assigned bus number 2 [ 3.548333] ehci-pci 0000:00:1d.7: debug port 1 [ 3.552228] ehci-pci 0000:00:1d.7: cache line size of 64 is not supported [ 3.552239] ehci-pci 0000:00:1d.7: irq 23, io mem 0xd3325000 [ 3.564014] ehci-pci 0000:00:1d.7: USB 2.0 started, EHCI 1.00 [ 3.564044] usb usb2: New USB device found, idVendor=1d6b, idProduct=0002 [ 3.564047] usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1 [ 3.564050] usb usb2: Product: EHCI Host Controller [ 3.564052] usb usb2: Manufacturer: Linux 3.11.0-12-generic ehci_hcd [ 3.564056] usb usb2: SerialNumber: 0000:00:1d.7 [ 3.564163] hub 2-0:1.0: USB hub found [ 3.564167] hub 2-0:1.0: 6 ports detected [ 3.564274] ehci-platform: EHCI generic platform driver [ 3.564280] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver [ 3.564281] ohci-platform: OHCI generic platform driver [ 3.564287] uhci_hcd: USB Universal Host Controller Interface driver [ 3.564345] uhci_hcd 0000:00:1a.0: setting latency timer to 64 [ 3.564347] uhci_hcd 0000:00:1a.0: UHCI Host Controller [ 3.564352] uhci_hcd 0000:00:1a.0: new USB bus registered, assigned bus number 3 [ 3.564378] uhci_hcd 0000:00:1a.0: irq 16, io base 0x0000f0c0 [ 3.564402] usb usb3: New USB device found, idVendor=1d6b, idProduct=0001 [ 3.564404] usb usb3: New USB device strings: Mfr=3, Product=2, SerialNumber=1 [ 3.564406] usb usb3: Product: UHCI Host Controller [ 3.564408] usb usb3: Manufacturer: Linux 3.11.0-12-generic uhci_hcd [ 3.564410] usb usb3: SerialNumber: 0000:00:1a.0 [ 3.564478] hub 3-0:1.0: USB hub found [ 3.564482] hub 3-0:1.0: 2 ports detected [ 3.564589] uhci_hcd 0000:00:1a.1: setting latency timer to 64 [ 3.564592] uhci_hcd 0000:00:1a.1: UHCI Host Controller [ 3.564597] uhci_hcd 0000:00:1a.1: new USB bus registered, assigned bus number 4 [ 3.564623] uhci_hcd 0000:00:1a.1: irq 21, io base 0x0000f0a0 [ 3.564647] usb usb4: New USB device found, idVendor=1d6b, idProduct=0001 [ 3.564649] usb usb4: New USB device strings: Mfr=3, Product=2, SerialNumber=1 [ 3.564651] usb usb4: Product: UHCI Host Controller [ 3.564653] usb usb4: Manufacturer: Linux 3.11.0-12-generic uhci_hcd [ 3.564654] usb usb4: SerialNumber: 0000:00:1a.1 [ 3.564727] hub 4-0:1.0: USB hub found [ 3.564730] hub 4-0:1.0: 2 ports detected [ 3.564834] uhci_hcd 0000:00:1a.2: setting latency timer to 64 [ 3.564837] uhci_hcd 0000:00:1a.2: UHCI Host Controller [ 3.564843] uhci_hcd 0000:00:1a.2: new USB bus registered, assigned bus number 5 [ 3.564863] uhci_hcd 0000:00:1a.2: irq 18, io base 0x0000f080 [ 3.564885] usb usb5: New USB device found, idVendor=1d6b, idProduct=0001 [ 3.564887] usb usb5: New USB device strings: Mfr=3, Product=2, SerialNumber=1 [ 3.564889] usb usb5: Product: UHCI Host Controller [ 3.564891] usb usb5: Manufacturer: Linux 3.11.0-12-generic uhci_hcd [ 3.564892] usb usb5: SerialNumber: 0000:00:1a.2 [ 3.564962] hub 5-0:1.0: USB hub found [ 3.564966] hub 5-0:1.0: 2 ports detected [ 3.565073] uhci_hcd 0000:00:1d.0: setting latency timer to 64 [ 3.565076] uhci_hcd 0000:00:1d.0: UHCI Host Controller [ 3.565081] uhci_hcd 0000:00:1d.0: new USB bus registered, assigned bus number 6 [ 3.565101] uhci_hcd 0000:00:1d.0: irq 23, io base 0x0000f060 [ 3.565124] usb usb6: New USB device found, idVendor=1d6b, idProduct=0001 [ 3.565127] usb usb6: New USB device strings: Mfr=3, Product=2, SerialNumber=1 [ 3.565128] usb usb6: Product: UHCI Host Controller [ 3.565130] usb usb6: Manufacturer: Linux 3.11.0-12-generic uhci_hcd [ 3.565132] usb usb6: SerialNumber: 0000:00:1d.0 [ 3.565195] hub 6-0:1.0: USB hub found [ 3.565198] hub 6-0:1.0: 2 ports detected [ 3.565303] uhci_hcd 0000:00:1d.1: setting latency timer to 64 [ 3.565306] uhci_hcd 0000:00:1d.1: UHCI Host Controller [ 3.565310] uhci_hcd 0000:00:1d.1: new USB bus registered, assigned bus number 7 [ 3.565329] uhci_hcd 0000:00:1d.1: irq 19, io base 0x0000f040 [ 3.565352] usb usb7: New USB device found, idVendor=1d6b, idProduct=0001 [ 3.565354] usb usb7: New USB device strings: Mfr=3, Product=2, SerialNumber=1 [ 3.565356] usb usb7: Product: UHCI Host Controller [ 3.565358] usb usb7: Manufacturer: Linux 3.11.0-12-generic uhci_hcd [ 3.565359] usb usb7: SerialNumber: 0000:00:1d.1 [ 3.565424] hub 7-0:1.0: USB hub found [ 3.565427] hub 7-0:1.0: 2 ports detected [ 3.565534] uhci_hcd 0000:00:1d.2: setting latency timer to 64 [ 3.565537] uhci_hcd 0000:00:1d.2: UHCI Host Controller [ 3.565541] uhci_hcd 0000:00:1d.2: new USB bus registered, assigned bus number 8 [ 3.565560] uhci_hcd 0000:00:1d.2: irq 18, io base 0x0000f020 [ 3.565584] usb usb8: New USB device found, idVendor=1d6b, idProduct=0001 [ 3.565587] usb usb8: New USB device strings: Mfr=3, Product=2, SerialNumber=1 [ 3.565588] usb usb8: Product: UHCI Host Controller [ 3.565590] usb usb8: Manufacturer: Linux 3.11.0-12-generic uhci_hcd [ 3.565592] usb usb8: SerialNumber: 0000:00:1d.2 [ 3.565658] hub 8-0:1.0: USB hub found [ 3.565661] hub 8-0:1.0: 2 ports detected ... [ 4.120014] usb 2-3: new high-speed USB device number 2 using ehci-pci ... [ 4.468908] usb 2-3: New USB device found, idVendor=046d, idProduct=0825 [ 4.468912] usb 2-3: New USB device strings: Mfr=0, Product=0, SerialNumber=2 [ 4.468914] usb 2-3: SerialNumber: AF582E10 ... [ 5.284019] usb 5-2: new full-speed USB device number 2 using uhci_hcd [ 5.465903] usb 5-2: New USB device found, idVendor=046d, idProduct=0b04 [ 5.465908] usb 5-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [ 5.465911] usb 5-2: Product: Logitech BT Mini-Receiver [ 5.465914] usb 5-2: Manufacturer: Logitech [ 5.468948] hub 5-2:1.0: USB hub found [ 5.470898] hub 5-2:1.0: 3 ports detected [ 5.476096] Switched to clocksource tsc [ 5.712099] usb 7-2: new full-speed USB device number 2 using uhci_hcd [ 5.896366] usb 7-2: New USB device found, idVendor=046d, idProduct=c52b [ 5.896370] usb 7-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [ 5.896372] usb 7-2: Product: USB Receiver [ 5.896374] usb 7-2: Manufacturer: Logitech [ 6.140016] usb 8-1: new full-speed USB device number 2 using uhci_hcd [ 6.324597] usb 8-1: New USB device found, idVendor=0738, idProduct=1708 [ 6.324603] usb 8-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [ 6.324605] usb 8-1: Product: Mad Catz R.A.T.7 Mouse [ 6.324608] usb 8-1: Manufacturer: Mad Catz [ 6.564012] usb 8-2: new low-speed USB device number 3 using uhci_hcd [ 6.746602] usb 8-2: New USB device found, idVendor=1d57, idProduct=0010 [ 6.746608] usb 8-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [ 6.746610] usb 8-2: Product: usb mouse with wheel [ 6.746613] usb 8-2: Manufacturer: HID-Compliant Mouse [ 7.337898] usb 5-2.2: new full-speed USB device number 3 using uhci_hcd [ 7.490902] usb 5-2.2: New USB device found, idVendor=046d, idProduct=c713 [ 7.490907] usb 5-2.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 7.490910] usb 5-2.2: Product: Logitech BT Mini-Receiver [ 7.490913] usb 5-2.2: Manufacturer: Logitech [ 7.490915] usb 5-2.2: SerialNumber: 001F203BD6A7 [ 7.569898] usb 5-2.3: new full-speed USB device number 4 using uhci_hcd [ 7.722901] usb 5-2.3: New USB device found, idVendor=046d, idProduct=c714 [ 7.722906] usb 5-2.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 7.722909] usb 5-2.3: Product: Logitech BT Mini-Receiver [ 7.722911] usb 5-2.3: Manufacturer: Logitech [ 7.722913] usb 5-2.3: SerialNumber: 001F203BD6A7 lsusb (more output): Bus 002 Device 002: ID 046d:0825 Logitech, Inc. Webcam C270 Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 008 Device 003: ID 1d57:0010 Xenta Bus 008 Device 002: ID 0738:1708 Mad Catz, Inc. Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 007 Device 002: ID 046d:c52b Logitech, Inc. Unifying Receiver Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 005 Device 004: ID 046d:c714 Logitech, Inc. diNovo Edge Keyboard Bus 005 Device 003: ID 046d:c713 Logitech, Inc. Bus 005 Device 002: ID 046d:0b04 Logitech, Inc. Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub More background. Before that I had a problem with logging in to GNOME. During which I upgraded all the packages at one point (apt-get upgrade) and it stopped booting at all (it didn't get to login screen). Then I fixed PATH issue and now I've got this usb-not-working issue. I tried reinstalling kernel, to no effect. Is there anything else I can do to fix or diagnose the problem?

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• OS Analytics - Deep Dive Into Your OS

  - by Eran_Steiner

  Enterprise Manager Ops Center provides a feature called "OS Analytics". This feature allows you to get a better understanding of how the Operating System is being utilized. You can research the historical usage as well as real time data. This post will show how you can benefit from OS Analytics and how it works behind the scenes. We will have a call to discuss this blog - please join us!Date: Thursday, November 1, 2012Time: 11:00 am, Eastern Daylight Time (New York, GMT-04:00)1. Go to https://oracleconferencing.webex.com/oracleconferencing/j.php?ED=209833067&UID=1512092402&PW=NY2JhMmFjMmFh&RT=MiMxMQ%3D%3D2. If requested, enter your name and email address.3. If a password is required, enter the meeting password: oracle1234. Click "Join". To join the teleconference:Call-in toll-free number:       1-866-682-4770  (US/Canada)      Other countries:                https://oracle.intercallonline.com/portlets/scheduling/viewNumbers/viewNumber.do?ownerNumber=5931260&audioType=RP&viewGa=true&ga=ONConference Code:       7629343#Security code:            7777# Here is quick summary of what you can do with OS Analytics in Ops Center: View historical charts and real time value of CPU, memory, network and disk utilization Find the top CPU and Memory processes in real time or at a certain historical day Determine proper monitoring thresholds based on historical data View Solaris services status details Drill down into a process details View the busiest zones if applicable Where to start To start with OS Analytics, choose the OS asset in the tree and click the Analytics tab. You can see the CPU utilization, Memory utilization and Network utilization, along with the current real time top 5 processes in each category (click the image to see a larger version):  In the above screen, you can click each of the top 5 processes to see a more detailed view of that process. Here is an example of one of the processes: One of the cool things is that you can see the process tree for this process along with some port binding and open file descriptors. On Solaris machines with zones, you get an extra level of tabs, allowing you to get more information on the different zones: This is a good way to see the busiest zones. For example, one zone may not take a lot of CPU but it can consume a lot of memory, or perhaps network bandwidth. To see the detailed Analytics for each of the zones, simply click each of the zones in the tree and go to its Analytics tab. Next, click the "Processes" tab to see real time information of all the processes on the machine: An interesting column is the "Target" column. If you configured Ops Center to work with Enterprise Manager Cloud Control, then the two products will talk to each other and Ops Center will display the correlated target from Cloud Control in this table. If you are only using Ops Center - this column will remain empty. Next, if you view a Solaris machine, you will have a "Services" tab: By default, all services will be displayed, but you can choose to display only certain states, for example, those in maintenance or the degraded ones. You can highlight a service and choose to view the details, where you can see the Dependencies, Dependents and also the location of the service log file (not shown in the picture as you need to scroll down to see the log file). The "Threshold" tab is particularly helpful - you can view historical trends of different monitored values and based on the graph - determine what the monitoring values should be: You can ask Ops Center to suggest monitoring levels based on the historical values or you can set your own. The different colors in the graph represent the current set levels: Red for critical, Yellow for warning and Blue for Information, allowing you to quickly see how they're positioned against real data. It's important to note that when looking at longer periods, Ops Center smooths out the data and uses averages. So when looking at values such as CPU Usage, try shorter time frames which are more detailed, such as one hour or one day. Applying new monitoring values When first applying new values to monitored attributes - a popup will come up asking if it's OK to get you out of the current Monitoring Policy. This is OK if you want to either have custom monitoring for a specific machine, or if you want to use this current machine as a "Gold image" and extract a Monitoring Policy from it. You can later apply the new Monitoring Policy to other machines and also set it as a default Monitoring Profile. Once you're done with applying the different monitoring values, you can review and change them in the "Monitoring" tab. You can also click the "Extract a Monitoring Policy" in the actions pane on the right to save all the new values to a new Monitoring Policy, which can then be found under "Plan Management" -> "Monitoring Policies". Visiting the past Under the "History" tab you can "go back in time". This is very helpful when you know that a machine was busy a few hours ago (perhaps in the middle of the night?), but you were not around to take a look at it in real time. Here's a view into yesterday's data on one of the machines: You can see an interesting CPU spike happening at around 3:30 am along with some memory use. In the bottom table you can see the top 5 CPU and Memory consumers at the requested time. Very quickly you can see that this spike is related to the Solaris 11 IPS repository synchronization process using the "pkgrecv" command. The "time machine" doesn't stop here - you can also view historical data to determine which of the zones was the busiest at a given time: Under the hood The data collected is stored on each of the agents under /var/opt/sun/xvm/analytics/historical/ An "os.zip" file exists for the main OS. Inside you will find many small text files, named after the Epoch time stamp in which they were taken If you have any zones, there will be a file called "guests.zip" containing the same small files for all the zones, as well as a folder with the name of the zone along with "os.zip" in it If this is the Enterprise Controller or the Proxy Controller, you will have folders called "proxy" and "sat" in which you will find the "os.zip" for that controller The actual script collecting the data can be viewed for debugging purposes as well: On Linux, the location is: /opt/sun/xvmoc/private/os_analytics/collect On Solaris, the location is /opt/SUNWxvmoc/private/os_analytics/collect If you would like to redirect all the standard error into a file for debugging, touch the following file and the output will go into it: # touch /tmp/.collect.stderr   The temporary data is collected under /var/opt/sun/xvm/analytics/.collectdb until it is zipped. If you would like to review the properties for the Analytics, you can view those per each agent in /opt/sun/n1gc/lib/XVM.properties. Find the section "Analytics configurable properties for OS and VSC" to view the Analytics specific values. I hope you find this helpful! Please post questions in the comments below. Eran Steiner

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• How to Identify Which Hardware Component is Failing in Your Computer

  - by Chris Hoffman

  Concluding that your computer has a hardware problem is just the first step. If you’re dealing with a hardware issue and not a software issue, the next step is determining what hardware problem you’re actually dealing with. If you purchased a laptop or pre-built desktop PC and it’s still under warranty, you don’t need to care about this. Have the manufacturer fix the PC for you — figuring it out is their problem. If you’ve built your own PC or you want to fix a computer that’s out of warranty, this is something you’ll need to do on your own. Blue Screen 101: Search for the Error Message This may seem like obvious advice, but searching for information about a blue screen’s error message can help immensely. Most blue screens of death you’ll encounter on modern versions of Windows will likely be caused by hardware failures. The blue screen of death often displays information about the driver that crashed or the type of error it encountered. For example, let’s say you encounter a blue screen that identified “NV4_disp.dll” as the driver that caused the blue screen. A quick Google search will reveal that this is the driver for NVIDIA graphics cards, so you now have somewhere to start. It’s possible that your graphics card is failing if you encounter such an error message. Check Hard Drive SMART Status Hard drives have a built in S.M.A.R.T. (Self-Monitoring, Analysis, and Reporting Technology) feature. The idea is that the hard drive monitors itself and will notice if it starts to fail, providing you with some advance notice before the drive fails completely. This isn’t perfect, so your hard drive may fail even if SMART says everything is okay. If you see any sort of “SMART error” message, your hard drive is failing. You can use SMART analysis tools to view the SMART health status information your hard drives are reporting. Test Your RAM RAM failure can result in a variety of problems. If the computer writes data to RAM and the RAM returns different data because it’s malfunctioning, you may see application crashes, blue screens, and file system corruption. To test your memory and see if it’s working properly, use Windows’ built-in Memory Diagnostic tool. The Memory Diagnostic tool will write data to every sector of your RAM and read it back afterwards, ensuring that all your RAM is working properly. Check Heat Levels How hot is is inside your computer? Overheating can rsult in blue screens, crashes, and abrupt shut downs. Your computer may be overheating because you’re in a very hot location, it’s ventilated poorly, a fan has stopped inside your computer, or it’s full of dust. Your computer monitors its own internal temperatures and you can access this information. It’s generally available in your computer’s BIOS, but you can also view it with system information utilities such as SpeedFan or Speccy. Check your computer’s recommended temperature level and ensure it’s within the appropriate range. If your computer is overheating, you may see problems only when you’re doing something demanding, such as playing a game that stresses your CPU and graphics card. Be sure to keep an eye on how hot your computer gets when it performs these demanding tasks, not only when it’s idle. Stress Test Your CPU You can use a utility like Prime95 to stress test your CPU. Such a utility will fore your computer’s CPU to perform calculations without allowing it to rest, working it hard and generating heat. If your CPU is becoming too hot, you’ll start to see errors or system crashes. Overclockers use Prime95 to stress test their overclock settings — if Prime95 experiences errors, they throttle back on their overclocks to ensure the CPU runs cooler and more stable. It’s a good way to check if your CPU is stable under load. Stress Test Your Graphics Card Your graphics card can also be stress tested. For example, if your graphics driver crashes while playing games, the games themselves crash, or you see odd graphical corruption, you can run a graphics benchmark utility like 3DMark. The benchmark will stress your graphics card and, if it’s overheating or failing under load, you’ll see graphical problems, crashes, or blue screens while running the benchmark. If the benchmark seems to work fine but you have issues playing a certain game, it may just be a problem with that game. Swap it Out Not every hardware problem is easy to diagnose. If you have a bad motherboard or power supply, their problems may only manifest through occasional odd issues with other components. It’s hard to tell if these components are causing problems unless you replace them completely. Ultimately, the best way to determine whether a component is faulty is to swap it out. For example, if you think your graphics card may be causing your computer to blue screen, pull the graphics card out of your computer and swap in a new graphics card. If everything is working well, it’s likely that your previous graphics card was bad. This isn’t easy for people who don’t have boxes of components sitting around, but it’s the ideal way to troubleshoot. Troubleshooting is all about trial and error, and swapping components out allows you to pin down which component is actually causing the problem through a process of elimination. This isn’t a complete guide to everything that could likely go wrong and how to identify it — someone could write a full textbook on identifying failing components and still not cover everything. But the tips above should give you some places to start dealing with the more common problems. Image Credit: Justin Marty on Flickr     

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• Tracking My Internet Provider Speeds

  - by Scott Weinstein

  Of late, our broadband internet has been feeling sluggish. A call to the company took way more hold-time than I wanted to spend, and it only fixed the problem for a short while. Thus a perfect opportunity to play with some new tech to solve a problem, in this case, documenting a systemic issue from a service provider. The goal – a log a internet speeds, taken say every 15 min. Recording ping time, upload speed, download speed, and local LAN usage.   The solution A WCF service to measure speeds Internet speed was measured via speedtest.net LAN usage was measured by querying my router for packets received and sent A SQL express instance to persist the data A PowerShell script to invoke the WCF service – launched by Windows’ Task Scheduler An OData WCF Data Service to allow me to read the data MS PowerPivot to show a nice viz (scratch that, the beta expired) LinqPad to get the data, export it to excel Tableau Public to show the viz     Powered by Tableau

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• Determine arc-length of a Catmull-Rom spline

  - by Wouter

  I have a path that is defined by a concatenation of Catmull-Rom splines. I use the static method Vector2.CatmullRom in XNA that allows for interpolation between points with a value going from 0 to 1. Not every spline in this path has the same length. This causes speed differences if I let the weight go at a constant speed for every spline while proceeding along the path. I can remedy this by letting the speed of the weight be dependent on the length of the spline. How can I determine the length of such a spline? Should I just approximate by cutting the spline into 10 straight lines and sum their lengths? I'm using this for dynamic texture mapping on a generated mesh defined by splines.

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• Can't recognize local webserver

  - by Syed Khalil-ur-Rehman

  My Internet Cable provider has set up a web server which hosts different entertainment material like movies, songs, tv shows and games etc. While using windows the pc recognises it as a local web server and downloads files with full LAN speed of 10 mb per second. On the contrary when using Ubuntu I am only able to download the files on my Internet speed not more than 100 kb per second. What ever I try ubuntu does not recognizes the webserver as a local area network web server but as a normal internet website. How to make Ubuntu download files from this server with full LAN speed. Please help in this regard. The url is http://dmasti.pk and yes it is a web server browsable by a web browser like firefox or ie.

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• How does one find out which application is associated with an indicator icon?

  - by Amos Annoy

  It is trivial to do this in Ubuntu 10.04. The question is specific to Ubuntu 12.04. some pertinent references (src: answer to What is the difference between indicators and a system tray?: Here is the documentation for indicators: Application indicators | Ubuntu App Developer libindicate Reference Manual libappindicator Reference Manual also DesktopExperienceTeam/ApplicationIndicators - Ubuntu Wiki ref: How can the application that makes an indicator icon be identified? bookmark: How does one find out which application is associated with an indicator icon in Ubuntu 12.04? is a serious question for reasons & problems outlined below and for which a significant investment has been made and is necessary for remedial purposes. reviewing refs. to find an orchestrated resolution ... (an indicator ap. indicator maybe needed) This has nothing to do (does it?) with right click. How can an indicator's icon in Ubuntu 12.04 be matched with the program responsible for it's manifestation on the top panel? A list of running applications can include all processes using System Monitor. How is the correct matching process found for an indicator? How are the sub-indicator applications identified? These are the aps associated with the components of an indicators drop-down menu. (This was to be a separate question and quite naturally follows up the progression. It is included here as it is obvious there is no provisioning to track down offending either sub or indicator aps. easily.) (The examination of SM points out a rather poignant factor in the faster battery depletion and shortened run time - the ambient quiescent CPU rate in 12.04 is now well over 20% when previously, in 10.04, it was well under 10%, between 5% and 7%! - the huge inordinate cpu overhead originates from Xorg and compiz - after booting the system, only SM is run and All Processes are selected, sorting on %CPU - switching between Resources and Processes profiles the execution overhead problem - running another ap like gedit "Text Editor" briefly gives it CPU priority - going back to S&M several aps. are at the top of the list in order: gnome-system-monitor as expected, then: Xorg, compiz, unity-panel-service, hud-service, with dbus-daemon and kworker/x:y's mixed in with some expected daemons and background tasks like nm-applet - not only do Xorg and compiz require excessive CPU time but their entourage has to come along too! further exacerbating the problem - our compute bound tasks no longer work effectively in the field - reduced battery life, reduced CPU time for custom ap.s etc. - and all this precipitated from an examination of what is going on with the battery ap. indicator - this was and is not a flippant, rhetorical or idle musing but has consequences for the credible deployment of 12.04 to reduce the negative impact of its overhead in a production environment) (I have a problem with the battery indicator - it sometimes has % and other times hh:mm - it is necessary to know the ap. & v. to get more info on controlling same. ditto: There are issues with other indicator aps.: NM vs. iwlist/iwconfig conflict, BT ap. vs RF switch, Battery ap. w/ no suspend/sleep for poor battery runtime, ... the list goes on) Details from: How can I find Application Indicator ID's? suggests looking at: file:///usr/share/indicator-application/ordering-override.keyfile [Ordering Index Overrides] nm-applet=1 gnome-power-manager=2 ibus=3 gst-keyboard-xkb=4 gsd-keyboard-xkb=5 which solves the battery ap. identification, and presumably nm is NetworkManager for the rf icon, but the envelope, blue tooth and speaker indicator aps. are still a mystery. (Also, the ordering is not correlated.) Mind you, it was simple in the past to simply right click to get the About option to find the ap. & v. info. browsing around and about: file:///usr/share/indicator-application/ordering-override.keyfile examined: file:///usr/share/indicators file:///usr/share/indicators/messages/applications/ ... perhaps?/presumably? the information sought may be buried in file:///usr/share/indicators A reference in the comments was given to: What is the difference between indicators and a system tray? quoting from that source ... Unfortunately desktop indicators are not well documented yet: I couldn't find any specification doc ... Well ... the actual document https://wiki.ubuntu.com/DesktopExperienceTeam/ApplicationIndicators#Summary does not help much but it's existential information provides considerable insight ...

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• OS Analytics with Oracle Enterprise Manager (by Eran Steiner)

  - by Zeynep Koch

  Oracle Enterprise Manager Ops Center provides a feature called "OS Analytics". This feature allows you to get a better understanding of how the Operating System is being utilized. You can research the historical usage as well as real time data. This post will show how you can benefit from OS Analytics and how it works behind the scenes. The recording of our call to discuss this blog is available here: https://oracleconferencing.webex.com/oracleconferencing/ldr.php?AT=pb&SP=MC&rID=71517797&rKey=4ec9d4a3508564b3Download the presentation here See also: Blog about Alert Monitoring and Problem Notification Blog about Using Operational Profiles to Install Packages and other content Here is quick summary of what you can do with OS Analytics in Ops Center: View historical charts and real time value of CPU, memory, network and disk utilization Find the top CPU and Memory processes in real time or at a certain historical day Determine proper monitoring thresholds based on historical data Drill down into a process details Where to start To start with OS Analytics, choose the OS asset in the tree and click the Analytics tab. You can see the CPU utilization, Memory utilization and Network utilization, along with the current real time top 5 processes in each category (click the image to see a larger version):  In the above screen, you can click each of the top 5 processes to see a more detailed view of that process. Here is an example of one of the processes: One of the cool things is that you can see the process tree for this process along with some port binding and open file descriptors. Next, click the "Processes" tab to see real time information of all the processes on the machine: An interesting column is the "Target" column. If you configured Ops Center to work with Enterprise Manager Cloud Control, then the two products will talk to each other and Ops Center will display the correlated target from Cloud Control in this table. If you are only using Ops Center - this column will remain empty. The "Threshold" tab is particularly helpful - you can view historical trends of different monitored values and based on the graph - determine what the monitoring values should be: You can ask Ops Center to suggest monitoring levels based on the historical values or you can set your own. The different colors in the graph represent the current set levels: Red for critical, Yellow for warning and Blue for Information, allowing you to quickly see how they're positioned against real data. It's important to note that when looking at longer periods, Ops Center smooths out the data and uses averages. So when looking at values such as CPU Usage, try shorter time frames which are more detailed, such as one hour or one day. Applying new monitoring values When first applying new values to monitored attributes - a popup will come up asking if it's OK to get you out of the current Monitoring Policy. This is OK if you want to either have custom monitoring for a specific machine, or if you want to use this current machine as a "Gold image" and extract a Monitoring Policy from it. You can later apply the new Monitoring Policy to other machines and also set it as a default Monitoring Profile. Once you're done with applying the different monitoring values, you can review and change them in the "Monitoring" tab. You can also click the "Extract a Monitoring Policy" in the actions pane on the right to save all the new values to a new Monitoring Policy, which can then be found under "Plan Management" -> "Monitoring Policies". Visiting the past Under the "History" tab you can "go back in time". This is very helpful when you know that a machine was busy a few hours ago (perhaps in the middle of the night?), but you were not around to take a look at it in real time. Here's a view into yesterday's data on one of the machines: You can see an interesting CPU spike happening at around 3:30 am along with some memory use. In the bottom table you can see the top 5 CPU and Memory consumers at the requested time. Very quickly you can see that this spike is related to the Solaris 11 IPS repository synchronization process using the "pkgrecv" command. The "time machine" doesn't stop here - you can also view historical data to determine which of the zones was the busiest at a given time: Under the hood The data collected is stored on each of the agents under /var/opt/sun/xvm/analytics/historical/ An "os.zip" file exists for the main OS. Inside you will find many small text files, named after the Epoch time stamp in which they were taken If you have any zones, there will be a file called "guests.zip" containing the same small files for all the zones, as well as a folder with the name of the zone along with "os.zip" in it If this is the Enterprise Controller or the Proxy Controller, you will have folders called "proxy" and "sat" in which you will find the "os.zip" for that controller The actual script collecting the data can be viewed for debugging purposes as well: On Linux, the location is: /opt/sun/xvmoc/private/os_analytics/collect If you would like to redirect all the standard error into a file for debugging, touch the following file and the output will go into it: # touch /tmp/.collect.stderr   The temporary data is collected under /var/opt/sun/xvm/analytics/.collectdb until it is zipped. If you would like to review the properties for the Analytics, you can view those per each agent in /opt/sun/n1gc/lib/XVM.properties. Find the section "Analytics configurable properties for OS and VSC" to view the Analytics specific values. I hope you find this helpful! Please post questions in the comments below. Eran Steiner

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• Problem with Ogmo Editor (is Tiled Editor a solution?)

  - by Mentoliptus

  I made a level editor for a puzzle game with Ogmo Editor and gave it to our designer/level designer. When he downloaded and started Ogmo, his CPU went to 100%. I looked at my CPU usage while Ogmo is running, and it goes from 20% to 30% (which is also high for an application alike Ogmo). He has a Windows 7 VM running on his Mac and I have a normal Windows PC, can this be a problem? I found a thread on FlashFunk forum that confirms that Ogmo has CPU usage issues. Has anybody maybe solved this issue? The solution seems to use Tiled Editor, but I never used it before. Is it difficult to change a level editor from Ogmo to Tiled? Can they export in the same format (XML with CSV elements for my puzzle game)?

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• What are the valid DepthBuffer Texture formats in DirectX 11? And which are also valid for a staging resource?

  - by sebf

  I am trying to read the contents of the depth buffer into main memory so that my CPU side code can do Some Stuff™ with it. I am attempting to do this by creating a staging resource which can be read by the CPU, which I will copy the contents of the depth buffer into before reading it. I keep encountering errors however, because of, I believe, incompatibilities between the resource format and the view formats. Threads like these lead me to believe it is possible in DX11 to access the depth buffer as a resource, and that I can create a resource with a typeless format and have it interpreted in the view as another, but I cannot get it to work. What are the valid formats for the resource to be used as the depth buffer? Which of these are also valid for a CPU accessible staging resource?

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• Ubuntu does not recognized local webserver

  - by Syed Khalil-ur-Rehman

  My Internet Cable provider has set up a web server which hosts different entertainment material like movies, songs, tv shows and games etc. While using windows the pc recognises it as a local web server and downloads files with full LAN speed of 10 mb per second. On the contrary when using Ubuntu I am only able to download the files on my Internet speed not more than 100 kb per second. What ever I try ubuntu does not recognizes the webserver as a local area network web server but as a normal internet website. How to make Ubuntu download files from this server with full LAN speed. Please help in this regard.

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• How can I switch memory modules to 1600 Mhz?

  - by Salvador

  Some months ago I bought 4 Memory modules of 4GB DDR3 1600 KINGSTON HYPERX. The official Kingston manual says: *This module has been tested to run at DDR3-1600 at a low latency timing of 9-9-9-27 at 1.65V.The SPD is programmed to JEDEC standard latency DDR3-1333 timing of 9-9-9. I cannot find which is the real speed of my memory modules. I normally get from several tools that the real speed is 1333 Mhz srs@ubuntu:~$ sudo dmidecode -t memory # dmidecode 2.9 SMBIOS 2.6 present. Handle 0x005D, DMI type 16, 15 bytes Physical Memory Array Location: System Board Or Motherboard Use: System Memory Error Correction Type: None Maximum Capacity: 32 GB Error Information Handle: 0x005F Number Of Devices: 4 Handle 0x005C, DMI type 17, 28 bytes Memory Device Array Handle: 0x005D Error Information Handle: 0x0060 Total Width: 64 bits Data Width: 64 bits Size: 4096 MB Form Factor: DIMM Set: None Locator: ChannelA-DIMM0 Bank Locator: BANK 0 Type: <OUT OF SPEC> Type Detail: Synchronous Speed: 1333 MHz (0.8 ns) Manufacturer: Kingston Serial Number: 07288F23 Asset Tag: 9876543210 Part Number: 9905403-439.A00LF How can I switch memory modules to 1600 Mhz?

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• Internet connection is very slow

  - by ThanujJA

  I use GSM onnection to surfe internet. Before I move to ubuntu I used windows 7 OS. It gives me good speed with GSM connection (100 kbps) But now ubuntu gives me very slow speed.(2-3 kbps) Now it make difficult to use GSM connection. In my country (Sri Lanka) mobile brodbrand servises are very expensive so I cant move to onother one. If I use GSM connection they gives me free data (Airtel connection) So it is most valuable reason for me to use GSM connection. Please anybody help me to speed up my network. Thanx

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• Effects to make a speeding spaceship look faster

  - by Badescu Alexandru

  I have a spaceship and I've created a "boost" functionality that speeds up my spaceship, what effects should I implement to create the impression of high speed? I was thinking of making everything except my spaceship blurry but I think there would be something missing. Any ideas? Btw. I am working in XNA C# but if you aren't familiar to XNA describing some effects is still useful. The Game is 3d and i've attached some printscreens of the game This is in normal mode ( none boosted ) and here is the boosted mode ( the craft speeds up forward while the camera speeds in its normal speed , the non boosted speed )

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• Samsung Series 5 overheating

  - by Sean Brad

  I bought a Samsung Series 5 Ultra 2 weeks ago and installed Ubuntu 12.04 LTS. I am experiencing problems with overheating. When streaming, watching a movie or when having several programms/actions going on at the same time the CPU temperature rises to 95 degrees and the computer freezes. This happens sometimes when the computer is on battery and always when it is recharging. When I am using the computer on battery the CPU temperature is floating from around 75-95 degrees depending what it's doing. When the battery is recharging the CPU temperature is ranging from 88-95 degrees no matter what tasks it performs. Have anyone experienced this and how may the problem be solved? Best regards

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• Cutting desktop power usage

  - by steevc

  I'm on a general energy saving mission. I've finally swapped my old CRT monitor for a LCD, so the next step it to optimise the PC power usage. It's using an AMD 64 X2 4600+ CPU which I know can trottle down, but seems to be running at a constant 2.4GHz. A while back I heard about Granola. I've installed it, but when I try to run it I get granola[10568]: Error opening scaling governor file '/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor' in read mode granola[10568]: Is cpufreq enabled in this kernel and do you have a CPU which supports DVFS? granola[10568]: Can't manage DVFS for any CPUs I'm happy to use other applications if Granola is not optimal or viable.

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• Continuous Movement of gun bullet

  - by Siddharth

  I was using box2d for the movement of the body. When I apply gravity (0,0) the bullet continuously move but when I change gravity to the earth the behavior was changed. I also try to apply continuous force to the bullet body but the behavior was not so good. So please provide any suggestion to continuously move bullet body in earth gravity. currentVelocity = bulletBody.getLinearVelocity(); if (currentVelocity.len() < speed|| currentVelocity.len() > speed + 0.25f) { velocityChange = Math.abs(speed - currentVelocity.len()); currentVelocity.set(currentVelocity.x* velocityChange, currentVelocity.y*velocityChange); bulletBody.applyLinearImpulse(currentVelocity,bulletBody.getWorldCenter()); } I apply above code for the continuous velocity of the body. And also I did not able to find any setGravityScale method in the library.

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• Changing balls direction in Pong

  - by hustlerinc

  I'm making a Pong game to get started with game-developement but I've run into a problem that i can't figure out. When trying to change the balls direction it doesn't change. This is the relevant code: function moveBall(){ this.speed = 2.5; this.direction = 2; if(this.direction == 1){ ball.X +=this.speed; } else if(this.direction == 2){ ball.X -=this.speed; } } function collision(){ if(ball.X == 500){ moveBall.direction = 2; } if(ball.X == 300){ moveBall.direction = 1; } } Why doesn't it work? I've tried many different ways, and none of them seem to work. The moveBall.direction changes though, since it alerts the new direction once it reaches the defined ball.X position. If someone could help me I would deeply appreciate it. I've included a JSFiddle link. http://jsfiddle.net/hustlerinc/y4wp3/

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• Why does my program stutter so much?

  - by user36322

  I've been very frustrated trying to solve this. I've looked it up, and all the answers are the same: set IsFixedTimeStep = false. This doesn't help me at all, the program is still jittery and stutters. I have absolutely no idea what is going on, can you guys help? Code for movement (objects is a list): speed = Math.Min(speed + (speedIncrement * gameTime.ElapsedGameTime.Milliseconds / 200), maxSpeed); for (int i = objects.Count - 1; i >= 0; i--) { objects[i].rect.Y += (int)(speed * gameTime.ElapsedGameTime.Milliseconds); //Check if the object is past the screen. If it is, remove it if (objects[i].rect.Y > screenHeight) { objects.Remove(objects[i]); } }

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• Ubuntu 13.04 is showing some error while opening my computer

  - by Singh

  Few months before when I was using Ubuntu 12.04 then I found some errors while starting my computer. Due to this problem I had given my CPU to a shop to repair it I don't know what he has done to my CPU but I only know that finally I got my CPU with Ubuntu 13.04. The technician was unable to make any partition and I also think that he had installed 13.04 over 12.04 and so now my computer is showing some error when I'm starting my computer the error is as follows: error: attempt to read or write outside of the disk 'hd0'. grub rescue _ Before showing this error, few times my computer was working very slow. So kindly someone tell me that is there any way by which I can start my computer. Please also tell me that what things I have to keep in mind while using Ubuntu so that in future I find no difficulties(errors) while using Ubuntu.

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• Component based design, but components rely on eatchother

  - by MintyAnt

  I've begun stabbing at a "Component Based" game system. Basically, each entity holds a list of components to update (and render) I inherit the "Component" class and break each game system into it. Examples: RenderComponent - Draws the entity MovementComponent - Moves the entity, deals with velocity and speed checks DamageComponent - Deals with how/if the entity gets damaged... So. My system has this: MovementComponent InputComponent Now maybe my design is off, but the InputComponent should say things like if (w key is down) add y speed to movement if (x key is down) Trigger primary attack This means that the InputComponent sort of relies on these other components. I have to do something alone the lines of: if (w key is down) { MovementComponent* entityMovement = mEntity->GetMovement(); if (entityMovement != NULL) add y speed to movement } which seems kinda crappy every update. Other options? Better design? Is this the best way? Thanks!

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• Acceleration Based Player Movement

  - by Mike Sawayda

  Ok, so I am making a first person shooter game and I am currently working on movement that looks and feels good. I want to incorporate acceleration based movement for the player so that he has to accelerate to max speed and decelerate to minimum speed. Acceleration will happen when you have the key pressed and deceleration will happen when you let go of that key. The problem is that there are some instances where you switch from moving forward to moving backward where no deceleration is needed because you could potentially be moving at double speed in the reverse if you did. Does anyone have a good implementation of how to accomplish acceleration based movement that works well?

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