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• Analyze Drupal and Wordpress sites CPU load in shared server

  - by Tedi

  Our hosting company is complaining that both our Drupal and Wordpress websites running in a shared server are consuming too many CPU resources. The traffic for each site is not more than 100 users per day and, at a first glance, we don't have very many plugins/add-ons. Is there any tool or resource to analyse what is causing that high CPU load? Thanks Update: We decided to suspend our accounts while the problem was being debugged but still our hosting (Site5) said that they saw unacceptable activity on our sites so we had to move to a dedicated server... asked them several times to provide us with more information and they always came back saying that we had to purchase a higher account. Finally decided to move to another hosting service.

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• Working with CPU cycles in Gameboy Advance

  - by Preston Sexton

  I am working on an GBA emulator and stuck at implementing CPU cycles. I just know the basic knowledge about it, each instruction of ARM and THUMB mode as each different set of cycles for each instructions. Currently I am simply saying every ARM instructions cost 4 cycles and THUMB instructions cost 2 cycles. But how do you implement it like the CPU documentation says? Does instruction cycles vary depending on which section of the memory it's currently accessing to? http://nocash.emubase.de/gbatek.htm#cpuinstructioncycletimes According to the above specification, it says different memory areas have different waitstates but I don't know what it exactly mean. Furthermore, what are Non-sequential cycle, Sequential cycle, Internal Cycle, Coprocessor Cycle for? I saw in some GBA source code that they are using PC to figure out how many cycles each instruction takes to complete, but how are they doing it?

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• MacBookPro 7,1 can only see one cpu

  - by gozzilli

  On a MacBookPro 7,1 running ubuntu 11.10, System monitor only sees 1 core (instead of 2). cat /proc/cpuinfo | grep 'cpu cores' also gives: cpu cores : 1 I followed this guide and added acpi_apic_instance=2 to the line with GRUB_CMDLINE_LINUX_DEFAULT, but that doesn't seem to change the situation. What can I do? I'm using rEFIt, installed under MacOS, and running in dual boot with MacOS. After the rEFIT menu, I'm still presented with the GRUB menu (I'm assuming that's normal). I saw similar posts on this matter, but could not fix my problem with what they suggested. EDIT: With the method mentioned above the computer runs sometimes with 1 core and other times with 2. Why is that? How can it be fixed?

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• ubuntu 11.10 on MacBookPro 7,1 can only see one cpu

  - by gozzilli

  On a MacBookPro 7,1 running ubuntu 11.10, System monitor only sees 1 core (instead of 2). cat /proc/cpuinfo | grep 'cpu cores' also gives: cpu cores : 1 I followed this guide and added acpi_apic_instance=2 to the line with GRUB_CMDLINE_LINUX_DEFAULT, but that doesn't seem to change the situation. What can I do? I'm using rEFIt, installed under MacOS, and running in dual boot with MacOS. After the rEFIT menu, I'm still presented with the GRUB menu (I'm assuming that's normal). I saw similar posts on this matter, but could not fix my problem with what they suggested. Any help appreciated. Thanks!

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• Is this CPU usage normal for Xorg?

  - by Samuaz

  I checked System Monitor to see if the frequency of my CPU increases without doing anything and saw that xorg is always using 10-40% of the CPU even if it's not doing much of anything on the desktop or simply surfing the Internet. Is this normal? If not, how can I fix it? I have: a Macbook white 4,1 Core2 Duo running at 2.10 GHz GPU Intel GMA X3100 4GB of RAM Ubuntu 11.04 I am running Unity and I do not have many effects enabled. I have only activated Compiz animations, scale, desktop, some shadows...

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• Second CPU missing of Dual Core

  - by Zardoz

  My Lenovo T61 has a dual core CPU. I just noticed that under Ubuntu 10.10 only one CPU is recognized. I know that once both CPUs worked. Not sure since when the second CPU is missing. Maybe since the last kernel update. Currently I am using linux-image-2.6.35-23-generic (for x86_64). What can I do to enable the second CPU again? Here the ouput of /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 23 model name : Intel(R) Core(TM)2 Duo CPU T8100 @ 2.10GHz stepping : 6 cpu MHz : 800.000 cache size : 3072 KB physical id : 0 siblings : 1 core id : 0 cpu cores : 1 apicid : 0 initial apicid : 0 fpu : yes fpu_exception : yes cpuid level : 10 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc arch_perfmon pebs bts rep_good aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm sse4_1 lahf_lm ida dts tpr_shadow vnmi flexpriority bogomips : 4189.99 clflush size : 64 cache_alignment : 64 address sizes : 36 bits physical, 48 bits virtual power management: Any help is welcome. I really need that CPU power for my work here.

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• Difference between “system-on-chip” and “CPU”

  - by Tim

  Very confused, in some websites, they have this line: iPhone 5s CPU: Apple A7 other websites saying that: iPhone 5s System-on-chip: Apple 7 CPU: 1.3 GHz 64bit dual core other sources saying that iPhone 5s System-on-chip: Apple 7 CPU: 1.3 GHz 64bit dual core Apple 7 In Wikipedia, it said: The Apple A7 is a 64-bit system on a chip (SoC) designed by Apple Inc. It first appeared in the iPhone 5S, which was introduced on September 10, 2013. Apple states that it is up to twice as fast and has up to twice the graphics power compared to its predecessor, the Apple A6. While not the first 64-bit ARM CPU, it is the first to ship in a consumer smartphone or tablet computer. There are 2 sentences: The Apple A7 is a 64-bit system on a chip (SoC) and While not the first 64-bit ARM CPU Wikipedia also said “The A7 features an Apple-designed 64-bit 1.3–1.4 GHz ARMv8-A dual-core CPU, called Cyclone”. So System on chip is also CPU? very confused

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• Huge CPU usage difference for the same .NET 4 program on different machines

  - by Kelvin Li

  I have two servers, one running core i7 920 (8 logic CPUs at 2.8Ghz), the other running Xeon X3430 (4 logic CPUs at 2.4Ghz). For the same .NET 4 application, CPU usage on the first machine is 6%; on the second machine it is 50%! I wonder what makes this huge difference. And how can I diagnose the cause of the issue?

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• Measuring CPU clocks consumed by a process

  - by hasanatkazmi

  Hi, I have written a program in C. Its a program created as result of a research. I want to compute exact CPU cycles which program consumes. Exact number of cycles. Any idea how can I find that?

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• Ubuntu One has high CPU usage but no syncing

  - by Peter

  over the weekend I updated my computer to Windows 8. So far Ubuntu One was running smoothly, but ever since the update (clean, new install) Ubuntu doesn't sync any more. In Windows 7 it would start to sync at full internet speed as soon as I drop a file. But now in Windows 8, as soon as I drop a new file into the Ubuntu One folder, CPU usage goes up to about 50 % and no network traffic occurs. This stays like that for a couple of minutes, CPU usage goes back to normal and then the client says that all is in sync - which isn't true. Is it too early for Windows 8? Do others have the same problem or is there something I can do about it? I try a couple of different things, and realized that if the file size is 20 MB the files get uploaded. The original file was 1.5 GB. I also didn't work with 200, 100 and 50 MB large files. But even with 20 MB large files, the upload is very slow and not steady. The log give plenty of this error: - twisted - ERROR - Failure: exceptions.TypeError About which I don't know the meaning. By the way, the account works just fine on the Ubuntu 12.04 partition. Any help is greatly appreciated. -Peter

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• checksum in raw sockets and pcap

  - by hero

  i am using pcap library to sniff some packets, change their tcp data , and then inject my packet on the network. my question is: if i changed in the tcp data, should i recalculate the length field in the tcp header? should i also change the checksum? i read in a page on how to create raw sockets that if you set the tcp_checksum to 0, the kernel will automatically calculate it and fill it, is this true for windows machines also?

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• How to run the CPU at something like 75%?

  - by Tobias Kienzler

  My notebook is too old for me to invest into a new fan (it will simply be replaced by a new one when the final heat death occurs), but when it runs on full speed I feel like sitting in front of a vacuum cleaner with integrated cooking... I'm currently using NHC, the Max Battery mode of which let's the CPU run at 50% (~800 MHz). That's fine for most applications, and both temperature and noise remain low. However, on some occasions I need a bit more speed, more around 75% maybe. Can I set the power saving settings somehow so that the CPU won't surpass 75% of it's capability so that an acceptable compromise between power and noise is achieved? I can't set the CPU frequency in the BIOS and since on rare occasions I'd like to be able to switch to 100% without much hassling, hardware solutions like setting jumpers are no option. This answer to a similar (linux!) question mentions NHC should be able to offer these options, but for me they are all greyed out: The notebook is an Asus Z9200K, I guess NHC doesn't support its chipset enough for these advanced options.

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• Can I make a "TCP packet modifier" using tun/tap and raw sockets?

  - by benhoyt

  I have a Linux application that talks TCP, and to help with analysis and statistics, I'd like to modify the data in some of the TCP packets that it sends out. I'd prefer to do this without hacking the Linux TCP stack. The idea I have so far is to make a bridge which acts as a "TCP packet modifier". My idea is to connect to the application via a tun/tap device on one side of the bridge, and to the network card via raw sockets on the other side of the bridge. My concern is that when you open a raw socket it still sends packets up to Linux's TCP stack, and so I couldn't modify them and send them on even if I wanted to. Is this correct? A pseudo-C-code sketch of the bridge looks like: tap_fd = open_tap_device("/dev/net/tun"); raw_fd = open_raw_socket(); for (;;) { select(fds = [tap_fd, raw_fd]); if (FD_ISSET(tap_fd, &fds)) { read_packet(tap_fd); modify_packet_if_needed(); write_packet(raw_fd); } if (FD_ISSET(raw_fd, &fds)) { read_packet(raw_fd); modify_packet_if_needed(); write_packet(tap_fd); } } Does this look possible, or are there other better ways of achieving the same thing? (TCP packet bridging and modification.)

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• Limiting max speed of sockets

  - by Lodle

  I'm using raw sockets on windows and I'm trying to find a way to limit the max connection speed over a group of sockets. For example I have 3 sockets to 3 servers and want to limit total download speed to 1mb. I googled and cant find any thing related. Any ideas?

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• questions about multi threading for sockets/tcp-connections.

  - by Fantastic Fourier

  I have a server that connects to multiple clients using TCP/IP connections, using C in Unix. Since it won't have more than 20 connections at a time, I figured I would use a thread per connection/socket. But the problem is writing to the sockets as I'll be sending user prompted msgs to clients. Once each socket is handled by a thread, how do I interact with the created thread to write to the sockets? Should each thread just read from the sockets and I'll write to sockets in the main program? Not sure if that's a good way to go about it.

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• Process to replace motherboard and keep CPU

  - by jolivier

  My motherboard has been diagnosed with the Sandy Bridge issue (http://vip.asus.com/eservice/changeSandybridge_MB.aspx?slanguage=en-us) so I am asked by my reseller to send back my motherboard to have a new one compatible with the previous one. My problem is that I have a not cheap Intel CPU currently on it, with its standard heatsink/fan. I would obviously like to keep it to plug it on the new motherboard. I am quite woried about the thermal paste. I was planning to: Remove the CPU and the HSF together (I think they are sticked to each other). Try to separate the CPU and the HSF (I'm not sure how) Clean both of the surfaces When the new motherboard is here, put the CPU back on it. Have new thermal paste to put again on the CPU, put it on the CPU Add the HSF again Do you see any problem about this process? Recommendations? Is it possible to keep the CPU and the HSF together for the whole process or is it impossible to plug the CPU back on the new motherboard in this case? Thanks in advance for your answers. Olivier

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• Monitoring CPU Usage Over the Course of a Day?

  - by bobber205

  Are there any apps I an install on client machines that will generate a report for me what app used what % of the CPU. We have some machines that are running, at times, VERY slowly. The machine will run really poorly then boom, back up to full speed. There isn't usually enough time to check Task Manager real quickly to see what is running, not to mention the majority of the time there are people using the computer that don't know what the Task Manager is. ;) It would be really nice to take a look at some logs and see if, maybe, the anti virus is randomly taking alot of CPU for stretches of time. Or another application. Thanks! EDIT: This is for Windows XP. Sorry for the oversight. :)

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• cpu usage and near to crash when i plug in the power cable

  - by mohamad

  i have had this problem since i installed ubuntu 12.4 on my laptop (on all of distro i have this problem execpt of backtrack) my problem is when i start my linux while it connect to power source there is no problem everything works fine . but when i disconnect and wants to work with battery it crash i mean everything work tooooo slowly and my cpu usage goes to 100 ... it happen too when i start my linux with battery and want to connect the power source to it .... it happens again . i updated my distro and now on i have 12.10 on my laptop but it has this problem . my lap top is hp probook 4520s my graphic card is ati radeon 530 v and i installed catalyst control center on my lap top and it works fine but the only problem is that what i said ...is it relate to my graphic card ???

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• How can I lower the CPU temperature?

  - by nmc

  I have installed Ubuntu 12.04 on my EeePC 1015PX and I've noticed that the CPU temperature does not go below 60ºC (70 is usual). Looking at powertop it seems the 2 cores (Atom N570) are idle most of the time. I've installed jupiter (w/ jupiter-eee-support) but it did not help. Edit: Meanwhile I've found out that echo 2 > /sys/devices/platform/eeepc-wmi/cpufv is supposed to turn on Super Hybrid Engine. Though it seems to help a bit (temperature goes down 2-3ºC), the temperatures are still in the 60-70ºc range.

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• Very High CPU usage (100%) from just browsing the Web

  - by cole

  I tested on Firefox and Chromioum. Im at 100% while loading pages which causes them to load slow and when I dont have a application running Im at 40% CPU (At least) Everything is slow basically. Im also already on Ubuntu Classic so im not using Unity. Should I go to 10.04? is that more stable? On windows this wasnt an issue. I have a Dual Boot with XP and a 2.4Ghz Intel Celeron with 768MB RAM and an Nvidia 6200 Graphics card. I heard 10.04 was the most stable. any suggestions?

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• Reading cpu temperature Intel Celeron (R) with lm-sensors

  - by tim_a

  I know there are already a lot of questions like this, but non of the answers provided there could fix my problem. I try to read out my cpu temperature with lm-sensors on my ubuntu 10.04 LTS installation but I can't get to work. I did try the command sensors-detect several times but still nothing. My computer is an old PC with an Intel Celeron (R) @ 2.60 GHz. The odd thing is that the hdd temp is shown in the applet but when I type in the terminal sensors I get the error: "No sensors found! Make sure you loaded all the kernel drivers you need." I'm not really interested in the hdd temperature but I think it is strange that these sensors do work in the applet and not in the terminal. This is the output that sensors-detect gives: http://pastebin.com/F4hVKaLU Any suggestions?

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• Ubuntu Gnome 14.04 - 100% CPU usage alternating between cores

  - by AwDeOh

  I've noticed my Ubuntu Gnome 14.04 has been getting a bit sluggish lately - things like Gnome Shell overview animation are jerky where they were lightning fast, Elder Scrolls Online is stuttering and dropping to low FPS where I previously had a solid 50-60 fps. Out of interest I looked at the CPU History, and when running nothing but the system monitor, I was getting this: That was 15 minutes ago. The 100% load seemed to be alternating between the cores. PC specs: i3 2130 processor. 8gb DDR3 RAM. ASUS P8-Z77M motherboard. Samsung 128gb SSD I've been trying to reproduce the problem, and while I'm not getting the 100% any more at idle, the system monitor is showing an average load of about 20-30%, that's with just Chrome and the System Monitor open. Oddly, if I touch nothing, it'll average out to about 20% - if I start moving the mouse around and do some typing, it's closer to 40%. Is this normal? Any help appreciated, I wouldn't even know where to start here..

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• How do i fix the slow scroll in browsers and high XOrg cpu usage

  - by Virgil

  I am facing an issue while scrolling in browsers(firefox, chrome, and opera) , scroll is jagged and slow. Also when scrolling the cpu usage spikes. I am currently running ubuntu natty(beta 1), switched from ubuntu 10.10 where the problem was worse. I am using the nvidia beta driver, which ubuntu installed automatically. My graphic card is nvidia Quadro NVS 150M. I tried running ubuntu without the effects on , but when using multiple applications at the same time xorg usage spikes again. Additional info: 2GB of RAM and an intel core 2 duo processor. Any help would be greatly appreciated. Thanks in advance!

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• cpu temperature imrpoves very fast

  - by myildirim

  Last few days i found out that when i click google chrome and the open it my laptop starts being angry.That's fans are working hardly and i can not touch the mousepad because of heating.I use Ubuntu 11.10 on my Toshiba A350-22z laptop and monitor cpu and harddrive temperature.Both cores reached 104 Celcius and i read somewhere "if your processor reaches 105Celcius it harms itself".I cleaned inside of laptop a year ago but there is a point : until wheather becomes about 20Celcius there was no problem.I know hardware cleaning is the best solution but how can i solve with another way ? I think problem is about outside's hot wheather.Is there anybody that has the same problem.In addition to Google Chrome i realized that when i open online video the processor temperature increas very fast.

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• CPU spikes to 100% when trying to watch video

  - by mark

  I just installed Ubuntu 12.04 and now CPU spikes to 100% when trying to watch a video. I don't want to hear that this is a problem with Flash or whatever... Playing video on my machine with Ubuntu 11 was just fine. In fact I have another machine still with Ubuntu 11 and it continues to play video just fine. Now I'm stuck with this 12.04 version and want to know how to downgrade back to version 11 as that version isn't buggy. (hence a downgrade).

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