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• will mmap use user cpu instead of whole sys cpu? (solaris)

  - by Daniel

  when use mmap to allocate some anonymous mem, we often set the start address as 0/null so mmap will figure out the starting address by itself. And to get the start address, it will work thought the whole virtual memory space to find a hole which could put the chuck of mem to be allocated. I guess this is calculated as user cpu instead of sys cpu. If the virtual memory is fragmented, then the time to find the starting address will use more user cpu, is my understanding correct

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• How to get total cpu usage in Linux (c++)

  - by cz-david

  I am trying to get total cpu usage in %. First I should start by saying that "top" will simply not do, as there is a delay between cpu dumps, it requires 2 dumps and several seconds, which hangs my program (I do not want to give it its own thread) next thing what I tried is "ps" which is instant but always gives very high number in total (20+) and when I actually got my cpu to do something it stayed at about 20... Is there any other way that I could get total cpu usage? It does not matter if it is over one second or longer periods of time... Longer periods would be more useful, though.

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• Can C++ memory leaks negatively affect CPU usage?

  - by Dan

  Hi all, I have a C++ program that has a pretty terrible memory leak, about 4MB / second. I know where it's coming from and can fix it, but that's not my main problem. My program is taking up a very large amount of CPU usage and it isn't running as fast as I want it to. I have two different threads in the program. One by itself takes ~50% CPU, which is fine, and the other by itself takes ~15% CPU, which is fine. Together however CPU usage is 100% and the program cannot run as fast as it needs to. Can a memory leak by itself cause a problem like this? I know the program will eventually crash due to the leaked memory, but does a memory leak immediately lead to a slower program? By immediately I mean the program is too slow at the very start, not just when the memory footprint is huge. Thanks!

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• What does CPU Time consist of? [closed]

  - by Sid

  What does CPU time exactly consist of? For instance, is the time taken to access a page from the RAM (at which point, the CPU is most likely idling) part of the CPU time? I'm not talking about fetching the page from the disk here, just fetching it from the RAM. Thanks

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• Gateway SX2300-01u CPU/PSU issues

  - by Vlad

  I have a 2-yr-old Gateway SX2300-01u with an AMD Phenom X3 8550 that I feel has about a year or so of life left, but I am having a couple of hardware issues that I have not been able to resolve. First, the power supply fan sounds like much louder than before and the PSU itself is really hot. The PSU model (Liteon PS 5221-06) is not available at a reasonable price; are there any good alternatives? Could I replace just the PSU fan? Also, the CPU fan failed sometime back, but my replacement, which supposedly fits the MB (Socket AM2+) doesn't actually fit properly. Any idea why?

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• High CPU usage when running a CentOS guest in VirtualBox

  - by sagi

  I am running CentOS 5.3 as a VirtualBox 3.0.0 guest running on Windows XP. The Windows host CPU usage is constantly at 50% although the CentOS guest is completely idle (i.e. 0.00 load average). I know this is a common problem related to the 1000Hz frequency that the CentOS kernel runs at, and previously a special kernel-vm packages were released to resolve the issue. However, these packages are out of date and the README says that they are not not necessary as of CentOS 5.3. I found out that there is supposedly a kernel parameter divider=10 that reduces the frequency to 100Hz with the standard kernel but it doesn't seem to have any effect when running inside VirtualBox. Is there any way to resolve the issue without resorting to a custom kernel?

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• What is the meaning of the sentence "we wanted it to be compiled so it’s not burning CPU doing the wrong stuff."

  - by user2434

  I was reading this article. It has the following paragraph. And did Scala turn out to be fast? Well, what’s your definition of fast? About as fast as Java. It doesn’t have to be as fast as C or Assembly. Python is not significantly faster than Ruby. We wanted to do more with fewer machines, taking better advantage of concurrency; we wanted it to be compiled so it’s not burning CPU doing the wrong stuff. I am looking for the meaning of the last sentence. How will interpreted language make the CPU do "wrong" stuff ?

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• CPU Cooling with Heatsinks

  - by Jason Tzen

  I've constructed a server that uses 2 Xeon E5-2620 CPUs and per Intel's recommendation I'm in the process of ordering heatsinks for each and I'm slightly concerned about thermal management. The case I'm using is well ventilated (the Coolermaster Cosmos II) but I have a few concerns regarding the adequacy of the heatsinks recommended by the MB manufacturer (Supermicro CPU HeatSink SNK-P0048PS). As you can see these heatsinks come without a fan and I'm wondering if they can keep the Xeons within their normal temperature range... Due to the low volume of literature on the topic I wasn't able to find anything conclusive.

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• Intel mobile CPU power consumption at idle levels?

  - by Ivan Petrushev

  I was wondering if someone has observations (or specifications) of different mobile processors power consumption levels when idle? Let's define 'idle' with 'browsing web sites trough wifi, no flash, no multitasking'. There are different series processors, recognizable by their first letter. The letter tells about the maximum TDP. For example: T - 30-39W P - max 25W L - 12-19W U - <12W However this is about maximum consumptions during load. Is there any difference in power levels when the CPU is idling?

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• Virtualized CPU cores vs. threads

  - by nedm

  We've got a KVM host system on Ubuntu 9.10 with a newer Quad-core Xeon CPU with hyperthreading. As detailed on Intel's product page, the processor has 4 cores but 8 threads. /proc/cpuinfo and htop both list 8 processors, though each one states 4 cores in cpuinfo. KVM/QEMU also reports 8 VCPUs available to assign to guests. My question is when I'm allocating VCPUs to VM guests, should I allocate per-core or per-thread? Since KVM/QEMU reports the server has 8 VCPUs to allocate, should I go ahead and set a guest to use 4 CPUs where I previously would have set it to use 2 (assuming 4 total VCPUs available)? I'd like to get the most possible out of the host hardware without over-allocating.

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• Nginx reverse proxy apache2 High CPU load

  - by chillah

  my server: 2x Intel Xeon 5506 2.13GHz 24 GB DDR3 RAM Debian 5.0.8 64-bit My server CPU is aroung 90% at 600 users and around 6 page views per second. There are 2 Sites on the server. One Forum with low visitors and a Wordpress page. My Apache configurations: MaxKeepAliveRequests 100 KeepAliveTimeout 15 ServerLimit 500 <IfModule mpm_prefork_module> StartServers 5 MinSpareServers 5 MaxSpareServers 10 MaxClients 250 MaxRequestsPerChild 1000 </IfModule> <IfModule mpm_worker_module> StartServers 2 MaxClients 250 MinSpareThreads 25 MaxSpareThreads 150 ThreadsPerChild 25 MaxRequestsPerChild 0 </IfModule> <IfModule mpm_worker_module> StartServers 2 MaxClients 250 MinSpareThreads 25 MaxSpareThreads 150 ThreadsPerChild 25 MaxRequestsPerChild 0 </IfModule> <IfModule mpm_event_module> StartServers 2 MaxClients 150 MinSpareThreads 25 MaxSpareThreads 75 ThreadLimit 64 ThreadsPerChild 25 MaxRequestsPerChild 0 </IfModule>

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• Intel mobile CPU consumption at idle levels?

  - by Ivan Petrushev

  Hello, I was wondering if someone has observations (or specifications) of different mobile processors power consumption levels when idle? Let's define 'idle' with 'browsing web sites trough wifi, no flash, no multitasking'. There are different series processors, recognizable by their first letter. The letter tells about the maximum TDP. For example: T - 30-39W P - max 25W L - 12-19W U - <12W source However this is about maximum consumptions during load. Is there any difference in power levels when the CPU is idling?

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• CPU I/O communication part 2

  - by b-gen-jack-o-neill

  Hi, I was suggested when I have some further questions on my older ones, to create newer Question and reffer to old one. So, this is the original question: CPU I/O communication OK, I have just 2 more questions. 1, How is MMIO set? I mean, lets say I have developed some extension card with PCI interface. How do you say to memory controller to redirect desired memory space to my card´s RAM? I mean, I think standart text-mode VGA MMIO adress is 0x8000. Is this HW set (every motherboard automatically redirects 0x8000 adress to PCI-E) or its just standart and can be changed (VGA says to motherboard: give me memory mapped IO at 0x8000) 2, Can one expansion card have more MMIO connections? I mean, lets say I have card with 10 Bytes of RAM. Can Bytes 0-4 be mapped to 0x0 and bytes 5-9 to 0x5000? Please, if you know about some good article about this, please post link. Thanks.

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• ngen.exe is constantly using CPU

  - by teedyay

  I recently installed Windows 7. This was a clean install (i.e. not an upgrade from another version of Windows), but I did install a bunch of other programs. All mainstream applications - nothing wacky. Since then, my CPU usage has been constantly at around 50%. Task Manager shows me that ngen.exe is the culprit. It's not a long-running task: I can see that it gets a new PID at least once a second, so I guess something is constantly triggering it. It does it all the time, even when I have no applications running. Has anyone else seen this? How do I find out what's causing this?

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• CPU spikes on small site- possibly apache or php config related

  - by Mike

  Hello, I hope you can help me. I have a site that I'm moving to a new datacenter. The server is pretty much vanilla, no control panel, and also no optimizations. When I hit a page, the site takes an extremely long time to load, despite it being relatively light weight. I ran top to see what was happening, and the cpu jumps to 75%, and drops back down to about 20% while the rest of the page is loading. Someone suggested that I ran lsof -p on the offending processes, but I'm not sure what I'm looking at. I ran through my httpd.conf file and commented out a bunch of loaded modules that didn't seem necessary, but that didn't help either. Anyone have any ideas? Output of the lsof http://pastebin.com/mfa113f

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• Can anyone explain these cpu specs?

  - by Kevin

  Intel® Core™ i7-640M (2.8~3.46GHz, 35W) w/4MB Cache - 2 Cores, 4 Threads - 2.5 GT/s SO i'm buying a new laptop, which i have not done in 6 years. So i am not familiar with any of these cpu specs. It was the highest option for intel for this laptop. So i am assuming it is somewhat fast. But i'd like to learn what these specs mean. Any help would be greatly appreciated. i am not really a computer guy but would love to learn about what I am buying. Thanks!

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• wmpnetwork.exe service clogs CPU usage

  - by Brenton Taylor

  We have remote locations each with 2 ASUS media extenders that stream from a computer with a shared Media Player library. Lately, several of these locations experience the "wmpnetwork.exe" service throttling the CPU to 100% usage. Killing the service only results in it starting back up, and so far the only temporary solution is to uninstall Media Player. A lot of these computers are also about 3-5 years old. Could it just be a case of outdated hardware not being able to do everything we ask them to do? Edit: all running Windows XP and Windows Media Player 11

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• VirtualBox CPU usage 100% on host

  - by Sarveshwar

  I have installed VirtualBox 3.1.2 (latest) on my Windows 7 (x64). In the VirtualBox I've installed Windows 7 (x64). I have 4 GB RAM installed. The guest has been assigned a 1536 MB RAM. Sometimes the CPU usage on the host goes 100%. It happens everytime, in a few minutes, after starting the guest. Then it stops responding. Then I have to "power off the machine" from the menu without doing a proper shutdown. It happens with Windows XP as guest too (even when the RAM amount assigned to it was the same). What is the problem?

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• Why is a single thread spread across CPU's?

  - by Marcus Lindblom

  I'm just curious why the scheduler constantly moves an app between CPUs, rather than keeping it on one. It looks a bit silly to have 4 cores at 25% rather than one at 100%. Does it has to do with heat, or is it more efficient somehow? Do other OS's do it differently? Insights or links to in-depth stuff would be nice. (Couldn't find much myself.) Update: By "spread out" I don't mean that it executes on several cpu's at once, but is being moved from one to the other several times per second, making the effect that it looks spread out.

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• CPU fan turns on and off repeatedly without booting

  - by rnso

  My PC has suddenly stopped starting up. On checking with case open, the CPU fan starts running when the power is turned on, but it stops after about 2-3 seconds, restarts again after about 2-3 seconds and the loop is repeated. There is no beep and nothing appears on the screen. On searching the internet, I found there could be several reasons for this. I tried removing hard-disk, CD drive, tightening connections etc but of no avial. I also tried using a new power supply but the response is the same. Where could be the problem and how can it be solved? Thanks in advance.

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• Flash stream makes my internet slow and cpu rush

  - by user1225840

  When I try to watch a live Flash stream, my CPU usage goes up to 75% and my Internet speed goes down. If I run a test before the video-stream, my speed is ~40/10Mbps and during the stream it drops to 0.1-0.5Mbps. The stream is laggy and I can only watch one to two seconds at a time, start/stop/start/stop. I have cleared my history, cache, cookies, temp files, and so on. I have searched for malware and took care of that. I have updated my drivers, reinstalled Flash and everything else I can think of, but it remains slow. I had this problem before and it just started working normally from one day to another. Could it be a hardware problem?

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• HP ML150 G6 upgrading RAM/CPU beyond specs?

  - by Morten Green Hermansen

  I am being told that some limits on some HP servers can be crossed. Do any of you have any experience with that? A ML150/G6 is limited to 48GB RAM but I have been talking to a German company that guaranties me that this server will be able to be upgraded to 384GB RAM (using 32GB memory modules and 2 CPUs) http://www.compuram.de/en/memory,HP+%28-Compaq%29,Server,Proliant,ML150+G6.htm Can this really be true? The server that I have is using E5504 CPUs but will I be able to upgrade to any CPU that is using a LGA1366 socket? All from a low wattage L5640 all the way to the 6 core, high wattage versions like an X5650? (If cooling and power is adequate ofcause). Is there any limitation with powerregulators and chipset (Intel 5500). I am looking forward to any reply. Thanks in advance and best regards, - Morten Green Hermansen, Fanitas

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• How to understand cpu family/model/stepping fields in /proc/cpuinfo

  - by Victor Sorokin

  I have following in cpuinfo: processor : 0 vendor_id : AuthenticAMD cpu family : 15 model : 107 model name : AMD Athlon(tm) 64 X2 Dual Core Processor 5600+ stepping : 2 According to Wikipedia page there are two kinds of 5600+ -- one of 90nm technology, another of 65nm. How can I understand which one I have? There seem to be no direct correspondence between contents of cpuinfo and info on Wikipedia page. AMD site seems to use some other naming scheme for processors too. How can I map values of family, model and stepping from cpuinfo to the data available on Wikipedia/AMD?

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• Articles of x386 and later CPU based systems

  - by user32569

  Hi there. I know this is hard question, and possibly not to be answered here, but if there is some article, or more you know about, please post a link. About books, its sad but many great computer books cannot be bought in my country. So, you can find many articles online, which says how memory was mapped back in pre x386 CPU. How there was explicit holes ready for MMIO BIOS, Video BIOS, etc. How there was A20 line for allowing higher memory access etc. Problem is, time changed. Today BIOSes are many times larger, and pure x86 16bit mode is used for booting and ROM flashing only. OS ignore BIOS as they access everything using drivers. And I just want to know, how it works today. I know not so specific question, but I read OS dev wiki, many articles, but all refering to days before massive usage of pure 32bit CPUs.

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• Reducing CPU load to absolute minimum [on hold]

  - by user191338

  I have had a couple of things gone missing I believe stolen in my shared apartment and want to run my laptop constantly with a webcam attached, running webcam surveillance software to record/ take pictures when motion is sensed. Id like to take whatever steps are necessary to be able to run the laptop constantly without the fan coming on, as its quite loud and even though it will be hidden it can be heard. Thus Id like to know what steps I can take to reduce CPU to the bare minimum for the laptop to boot up and run the camera software and send images via ftp / email when necessary. I have windows 7 installed, though I can reinstall it clean. Which are the windows services can I turn off, and more extreme disabling or measures of whatever kind which I can take. The OS would need to run the camera, wifi / networking. Thanks very much for any help.

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