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• Best idea dataserver serving small pictures 40 ko

  - by Nicolas Manzini

  I'm designing the server structure for my application in case things go well. I have one server DB connected to multiple server who process connections. All those with lots of RAM and fast processors. (still looking for a way to use the multithread because now it's dumb apache php... so loooots of ram needed). Upon an answer from those servers, the client can then connect to another server to retrieve pictures using the address he previously got from the db. Is it a good idea to have one database server with let's say nginx and ssd disk having to send all pictures to everybody? or should I have multiple server accessing to a shared ssd disk drive or multiple disk updating each other? Also should I put a lot of RAM on the database server? because probably there wont be a picture more popular than another.

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• How does a segment-based rendering engine (as in Descent) work?

  - by Calmarius

  As far as I know Descent was one of the first games that featured a fully 3D environment, and it used a segment based rendering engine. Its levels are built from cubic segments (these cubes may be deformed as long as it remains convex and sides remain roughly flat). These cubes are connected by their sides. The connected sides are traversable (maybe doors or grids can be placed on these sides), while the unconnected sides are not traversable walls. So the game is played inside of this complex. Descent was software rendered and it had to be very fast, to be playable on those 10-100MHz processors of that age. Some latter levels of the game are huge and contain thousands of segments, but these levels are still rendered reasonably fast. So I think they tried to minimize the amount of cubes rendered somehow. How to choose which cubes to render for a given location? As far as I know they used a kind of portal rendering, but I couldn't find what was the technique used in this particular kind of engine. I think the fact that the levels are built from convex quadrilateral hexahedrons can be exploited.

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• Dim (NEARLY blank) laptop screen, secondary screen works - why?

  - by LIttle Ancient Forest Kami

  My laptop screen is (almost) black while my secondary screen is fine. I believe it to be backlight / brightness related. Problem description it starts when I start the laptop system loads and works fine, just screen has problems I can see the screen though very faintly / dimly - it's hard to see anything which ain't very white e.g. starting screen has big Thinkpad logo in white, large font - I can see it, though very dimly second screen works very well Official backligtht debugging: using acpi setting as prescribed there for Thinkpads didn't help I can see an entry in /sys/class/backlight/ and it changes when I press hotkeys for brightness (current backlight power for instance goes up or down) acpi-off didn't helpm neither did acpi_backlight=vendor Hardware data Laptop is Thinkpad Edge with glossy screen. 4 processors, 2 cores, exemplary CPU data from cat /proc/cpuinfo reports Genuine Intel i5 (M 480 @ 2.67GHz). OS is Ubuntu Lucid, 10.04 LTS, 64-bit, with Linux generic kernel (2.6.32-44) and GNOME 2.32.2 (though I doubt there lies the problem). $ lspci | grep VGA 01:00.0 VGA compatible controller: ATI Technologies Inc M92 [Mobility Radeon HD 4500 Series] $ lshw -C display *-display description: VGA compatible controller product: M92 [Mobility Radeon HD 4500 Series] vendor: ATI Technologies Inc physical id: 0 bus info: pci@0000:01:00.0 version: 00 width: 32 bits clock: 33MHz capabilities: pm pciexpress msi bus_master cap_list rom configuration: driver=radeon latency=0 resources: irq:33 memory:c0000000-dfffffff(prefetchable) ioport:2000(size=256) memory:f0300000-f030ffff memory:f0320000-f033ffff(prefetchable) Driver I was NOT running any proprietary drivers, just checked with "Hardware drivers". There is one for ATI that is suggested there, though I didn't need it so far. UPDATE: changing the driver to proprietary one (ATI/AMD FGLRX) didn't help. Tried and failed Resetting / running on power or battery / charging / getting rid of static electricity / warming up *doesn't help* This is NOT a blank-screen problem, at least it isn't following official Ubuntu black-screen diagnostics - I can see my screen, though barely. What I will try next: - check last updates I've made - IIRC I am running on nomodeset already, but will verify this Any ideas how to proceed best? What is most probable cause?

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• find kernel config option in menuconfig

  - by puchu

  I've upgraded my gentoo-sources today to 3.3.8, and now I am looking at diff between old kernel's defconfig and old kernel's .config: there are about 20 changes. I want to apply this changes manually to new kernel's menuconfig. Where can I find tool like: menuconfig-find -v 3.3.8-gentoo CONFIG_KVM_AMD >> Virtualization >> -> Kernel-based Virtual Machine (KVM) support >> -> KVM for AMD processors support

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• Windows Server 2008 R2 Maximum Processor Limit Confusion

  - by Stevoni

  As I was looking through the Windows Server 2008 R2 specifications, I saw that the maximum supported processors is 64 sockets for Datacenter addition. This puts the maximum number or cores at 256 (if all sockets are quad cores), which I think it's just silly, but whatever. And now the questions: How does one set something like that up? (Obviously not for me, but humor me) Are there multiple dual socket motherboards running in a giant case with a ton of memory? How does the OS see all of the CPUs if they're on different boards? What would be a real world example of a need to have 64 sockets attached to one operating system vs 32 2 socket servers?

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• Asus A8V overcurrent

  - by user139710

  This is not as much as a question as it is a note to those out there that upgrade their motherboards with better processors and the like. Here's my story. Recently I upgraded my processor. System specifications: • Asus A8V Deluxe • 4GB RAM • ATI Radeon 3870 AGP graphics card (I believe that's it) Anyway, I decided to put a dual core Opteron 180 in this rig, but the problem was that I needed to update the BIOS to V-1017, and not knowing the consequences, I went up to the Asus site and got the newest, the latest and the greatest, 1018.002 thinking that it was the best for this board, however it wasn't. I used the Asus EXFlash, which makes life a lot easier, flashed the BIOS and all of a sudden I start getting this message: USB overcurrent protection, system shutting down in 15 seconds to protect your system. WELL SHIT... This is a new one on me... I read the blogs, all the posts on this thing, and did all that everyone else did to correct the problem, but nothing helped. So i decided to start from square one, went back to Asus and looked at the BIOS download... OMG... IT WAS A BETA. So, I downloaded the update that was suggested 1017< and installed it and wouldn't you know, it took care of the problem, no more USB overcurrent protection, no more crashing. I write this today to let you all know about this, just in case you have an issue such as this. Well there you all go. Fly safe and eat your vegetables.

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• what to use instead of laptop-mode?

  - by playcat

  hello, i have ubuntu 10.10 64bit on hp 6735s (turion processor). it overheats, and i'm forced to use turion power control in order to keep core temperature to a reasonable level. one more measure that i use is putting my processors to conservative mode. that way, i'm perfectly happy with its performance, and heat is where it should be. however, after my latest upgrade, something happened - cores are back to ondemand by default, and i'm not sure if turionpowercontrol is working any more (ps axu | grep urion shows no process). in addition, i read somewhere that laptop-mode uses hdd spindown for preserving data/energy, and that hdds have only a limited amount of those spindowns, so laptop-mode usage can actually shorten the life of my hdd. i'm wondering if there is a good way to set my cores to automatically go to conservative mode? also, what's the good way to see what is the voltage my cores use? on windows i use cpuz tools. thx and sorry for the long explanation.

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• 12.04 Taking forever for no apparent reason

  - by Sam

  First off, I'd just like to say how much I'm loving Ubuntu so far. It's one of my first steps into Linux, but so far it's blown away Windows in almost every regard. Now, onto my problem. My brothers have some old Dell Dimensions that are barely clinging to life. They were both running XP Home Premium. The 2400 installed just fine, no issues at all. Now, the other computer, the 3000 isn't clearing the screen with the Ubuntu logo and the pulsing dots. I've tried multiple discs, including the exact same one that gave me no issue in the other computer, and I'm at a loss. Does anyone have any suggestions as to where the problem might lay? They're both 32 bit Intel processors, and it's the correct version of Ubuntu. Is it a bad disc drive? Hardware incompatibility? Thanks for any assistance that can be provided. Dell Dimension 2400 Dell Dimension 3000

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• Build vs Buy Webcast: November 8, 2012

  - by TammyBednar

  Date: Thursday, November 8, 2012, 1:00 PM EST You have a choice. Do you build your own database platform or buy a pre-engineered database appliance? Building a high-availability database platform presents unique challenges. Combining servers, storage, networking, OS, firmware, and database is complicated and raises important concerns: Will coordination between multiple SME’s delay deployment? Will it be reliable? Will it scale? Will routine maintenance consume precious IT-staff time? Ultimately, will it work? Enter the Oracle Database Appliance, a complete package of software, server, storage, and networking that’s engineered for simplicity. It saves time and money by simplifying deployment, maintenance, and support of database workloads. Plus, it’s based on Intel Xeon processors to ensure a high level of performance and scalability. Attend this Webcast to hear customer stories and discover how the Oracle Database Appliance: Increases ROI by reducing capital and operational expenses Frees IT staff by reducing deployment and management time from weeks to hours Takes the worry out of supporting mission critical application workloads Register For this WebCast today!

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• Running OpenVZ virtual servers within a Xen XCP vritual server? Bad practice?

  - by Damainman

  I have a 1 server with 8GB RAM and 2xQuadcore Processors. It currently has the Xen XCP installed on it, and centos6.2 x64 running on a virtual machine. I have a server control panel software that I want to use and it allows the administration via a web interface for Openvz machines. My questions are: Would this be considered bad practice? Would there be a big performance hit? Should I avoid this all together or am I going about it all wrong? Thank you in advance.

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• Computer refuses to POST

  - by TheX

  Computer refuses to POST. What it will do is the fan spins up, and the lights come on on the motherboard, but other then that it just sits there and laughs in my face! Here is what I have done... I have tried 2 different video cards, both known to work, 4 different sticks of RAM in all four ram slots, 2 processors (known to work), and 2 power supplies (known to work). The only constant is the motherboard... The Motherboard is a Asus m3a3-mvp deluxe. Anyone have any other ideas? Also, I have bread boarded it to make sure there where no shorts (taken everything out of the case and tried again).

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• Why does Resource Monitor in windows 7 show half my memory as "Hardware Reserved"?

  - by Brandon

  Does anyone know why in Windows 7 Resource Monitor shows that I have 8 GB of RAM installed on my computer, but I only have 3.2 GB available as 4.8 GB are in "Hardware Reserve". I researched this issue and tried going into msconfig and making sure that in the boot options the number of processors and max memory options were turned off. I also opened the computer up and reseated each of the memory sticks while clearing out any dust that was in there. Some info on the system I am using: OS: Windows 7 Enterprise 64-bit Edition CPU: AMD Phenom X4 9750 Memory: 4 X 2GB DDR2 memory Motherboard: MS-7548 (Aspen) Any help would be much appreciated.

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• If I double my ram on a x86 processor, does that double the ram I can use for each individual process?

  - by Derek Reitz

  I don't understand how 32-Bit OS's use RAM on a per process basis. I've read the max RAM my x86 processor running a 32-bit OS can use is 2^32 = 4gb; but that's just for one process, right? 3DS Max keeps crashing, but it typically can never use more than 2GB of RAM before it crashes, if I increase my RAM from 4-8GB, would that double how much RAM I can use for each individual process or actually cause no change in my performance? Also would increasing my VRAM and getting a better graphics card increase the extent to which individual programs can preform? Lastly, is there any way to upgrade a 86-bit processor to be able to run a 64-bit OS? I feel like it would be ridiculous to sell modern processors that are capped at 4GB of RAM? Thanks. Quad-Core Intel i7 Q 720 @ 1.6GHz

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• Building my own computer

  - by There is nothing we can do

  I'm planning to build my own computer. I do not have enough cash to buy all components I need in one go. I want to ask, if I buy motherboard which is compatible with i7 processor (any) and compatible with graphic card Nvidia gtx 780, does it mean that this mother board will be compatible with processors (from intel) which will be released next year? Same for graphic cards? The point is that I'd like to avoid situation where I buy motherboard let's say now, and in couple of months there will be new graphic card/processor which will not be compatible with my mother board? Or maybe shall I start completely somewhere else?

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• Context switches much slower in new linux kernels

  - by Michael Goldshteyn

  We are looking to upgrade the OS on our servers from Ubuntu 10.04 LTS to Ubuntu 12.04 LTS. Unfortunately, it seems that the latency to run a thread that has become runnable has significantly increased from the 2.6 kernel to the 3.2 kernel. In fact the latency numbers we are getting are hard to believe. Let me be more specific about the test. We have a program that has two threads. The first thread gets the current time (in ticks using RDTSC) and then signals a condition variable once a second. The second thread waits on the condition variable and wakes up when it is signaled. It then gets the current time (in ticks using RDTSC). The difference between the time in the second thread and the time in the first thread is computed and displayed on the console. After this the second thread waits on the condition variable once more. So, we get a thread to thread signaling latency measurement once a second as a result. In linux 2.6.32, this latency is somewhere on the order of 2.8-3.5 us, which is reasonable. In linux 3.2.0, this latency is somewhere on the order of 40-100 us. I have excluded any differences in hardware between the two host hosts. They run on identical hardware (dual socket X5687 {Westmere-EP} processors running at 3.6 GHz with hyperthreading, speedstep and all C states turned off). We are changing the affinity to run both threads on physical cores of the same socket (i.e., the first thread is run on Core 0 and the second thread is run on Core 1), so there is no bouncing of threads on cores or bouncing/communication between sockets. The only difference between the two hosts is that one is running Ubuntu 10.04 LTS with kernel 2.6.32-28 (the fast context switch box) and the other is running the latest Ubuntu 12.04 LTS with kernel 3.2.0-23 (the slow context switch box). Have there been any changes in the kernel that could account for this ridiculous slow down in how long it takes for a thread to be scheduled to run?

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• Raspberry Pi based Hadoop cluster

  - by Dmitriy Sukharev

  Is it at least possible to build Hadoop cluster from Raspberry Pi-based nodes? Can such a cluster meet hardware requirements of Hadoop? And if so, how much Raspberry Pi nodes are required to meet requirements? I understand that a cluster from several Raspberry Pi nodes being cheap is not powerful. My purpose is to organize cluster without possibility of loosing personal data from my desktop or notebook, and to use this cluster studying Hadoop. I'd appreciate if you suggest any better ideas of organizing a cheap Hadoop cluster for studying purposes. UPD: I've seen that recommended amount of memory for Hadoop is 16-24GB, multi-core processors, and 1TB of HDD, but it doesn't look like minimal requirements.

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• Kernel compiling with -j2+ parameter ends prematurely with no error message or output bzImage

  - by Minix

  I've noticed quite a while ago that compiling a kernel with the parameter -j set to 1 or more doesn't produce a bzImage. Instead, it ends prematurely without any advice. I have reproduced the same behavior in both my netbook and home server. As far as I'm aware, the point where the compilation stops is random - Compiling twice with the same parameters will probably stop at different files. However, when I run make with no -j* parameter the compilation ends just fine and outputs a working bzImage. Both machines run Intel Atom (N270 on the netbook and 330 on the server) and I've compiled for these processors. If I recall correctly, I've tried compiling both with Atom and with generic x86_64 options. The kernel version I'm building is 2.6.34.1 I've always compiled normally with those options in my Core2Duo and Pentium Dual Core machines. Has anyone experienced this issue? Any ideas why does this happens? Is there a fix or workaround?

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• New Servers Active Directory and Exchange

  - by user3164638

  I have 3 Dell PowerEdge server, each with 2 quad-core processors. I am going to bring this office out of the stone-age network (P2P, share files on a flash drive, emails through Google, etc) and set up Active Directory and Exchange 2013. Our needs are not that great at the moment - our staff consists of approximately 40 people, and our network may eventually be managed by an external company. We need only one domain for our emails (though we may serve emails for a few other partners domains as well). I was thinking of setting something up like this: Server 1: Primary DC. Active Directory and Exchange on separate virtual machines. Server 2: Redundant of server 1. Server 3: Shared resources, storage, backups, etc. How would you utilize 3 servers for an Active Directory / Exchange setup for a small/medium office? We do have plans to grow, so my solution must be scalable, though I'm not sure that I want to split permissions, though I'd consider it if that was something that could be changed on down the road.

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• Is virtual machine slower than the underlying physical machine?

  - by Michal Illich

  This question is quite general, but most specifically I'm interested in knowing if virtual machine running Ubuntu Enterprise Cloud will be any slower than the same physical machine without any virtualization. How much (1%, 5%, 10%)? Did anyone measure performance difference of web server or db server (virtual VS physical)? If it depends on configuration, let's imagine two quad core processors, 12 GB of memory and a bunch of SSD disks, running 64-bit ubuntu enterprise server. On top of that, just 1 virtual machine allowed to use all resources available.

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• CPU Configuration Issue for 2 Servers (Server 2008 R2)

  - by Bill Moreland

  I have 2 servers running the exact same Classic ASP code with Access DBs (yes, not ideal, but it is what it is, for now). 1) Xeon 5520 @ 2.27 GHz (6 GB Memory) 2) Xeon E5-2620 @ 2.00 GHz (2 processors, 32 GB Memory) For most pages the newer E5-2620 processes the pages between 10-15% faster. On pages requiring heavy and/or multiple complicated access stored procedures (queries) the older 5520 does a much better job. I believe the servers are configured nearly identically. My question: is it possible that the newer, multi-processor server is not as good at handling Classic ASP as the older single processor? Is there a configuration difference that needs to be in place that I'm missing since I'm shooting for identical implementations?

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• Can I rent exclusive time on a powerful server running linux? [closed]

  - by Mark Borgerding

  My company is involved in a proposal that requires speed estimates of our software on a server with the latest & greatest processors. This is not the first time we've been in this situation. The servers themselves are too expensive to buy a new one every time, so we end up extrapolating from what we have. There are so many variables: processor generation & speed, memory speed, memory channels, cache configurations; it makes extrapolation difficult and error-prone. Is there a business that rents time on the newest servers? At least part of the time we'd need exclusive access to an otherwise quiescent system either via ssh shell access or unattended batch jobs. I am not looking for general cloud computing services. I don't need much time on the server, but it needs to be exclusive. And the server needs to be pretty cutting edge for a solid basis of estimate.

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• My CPU hits 100°C... Help me!

  - by JamesT

  The safe limit for processors is typically 50°C or so, but I have found that my CPU likes to do up to 100°C. I have got these readings from SpeedFan 4.42. I have a Intel Quad Core unclocked. I am using the standard intel fan with heatsink that came with the prossesor My case is a Cooler Master and I have two fans installed on the case. I took the side off to see if that helped. It lowered the temp be 3C. I don't really want to blow the processor and I don't know how to cool it down.

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• Is it possible to put an 8000 series socket-F Opteron into a dual-socket motherboard?

  - by René Kåbis

  Exactly what it says on the Tin. I have a dual-socket, socket-F motherboard in which I am looking to put two high-end quad-core Opterons, but the 2000 series are nearly double the price of the 8000 series on eBay. Can I just drop in a pair of 8000 series processors and be done with it, or are there processor-critical motherboard features that would be present on a quad(+)-socket motherboard that don’t exist on a dual-socket motherboard? Please elaborate or link to resources that can explain this further, as I am not adverse to research (and I am interested in the technical issues involved) I am probably using the wrong search terms, as Google failed to return anything within the first few dozen results.

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• Error installing SQL Server 2005 Express on AMD Turion?

  - by Angel

  Hello. Is there some compatibility problem between SQL Server 2005 Express and AMD processors? I read something along those lines on various sites, but found nothing 100% definitive. I am trying to install SQL Server 2005 Express on a computer that runs Windows Vista Home Premium, 32-bit edition, and the CPU is "AMD Turion Dual-Core RM-70". I tried both the 32-bit and 64-bit installers, just in case, and the process runs fine until the moment the service attempts to start, where it fails with the same error every time. I'm sorry I can't provide more details or the exact message, it was on a client computer to which I have no access at the moment. I hope someone could shed some light on this. Thank you.

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• Too Much Swapping, even though RAM is 2/3 Empty

  - by indyaah

  I have a VPS with 9GB RAM, 300GB HDD, 3 GB Swap, 7 Cores. The OS is CentOS 5.7 Final. I have postgres9.0 running on my machine, with proper tuning done (at least by book/wiki of PostgreSQL). What happens is most of the times when some complex query run (by complex I mean select with maximum 3 Joins), eventhough 66% of my RAM is unused there is ~99% swapping is happening. Plus it screws up my disk IO which is most of the time reaching ~100% and slows down everything else. (I tend to believe something's wrong with my disk.) I dont understand the reason of this much of swapping happening. Is it because of context switching?? Most of the time my processors are idle, while the IO wait goes upto 30% during pick times. Would appreciate if some can shed some light on it. Thanks.

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