The cpu tag has no wiki summary.
3
votes
2answers
72 views
CPU usage of KVM
I have a linux host with 4 KVM linux guests. All the guest are pretty much idle, having a load of <0.1 inside the guest.
Now, if I do a top on the host, each KVM process is using something about ...
0
votes
1answer
157 views
Limit cpu and memory usage for php-fpm and nginx processes in centos
I want to Limit cpu and memory usage for php-fpm and nginx processes in centos.
I came across following tools
cpulimit
cggroups
memory resource locater
which will more efficient and how can I ...
5
votes
1answer
247 views
Loading speedstep_centrino kernel module
Because of a noisy fan in my laptop, I need to change CPU frequency and for this task I need to load the appropriate kernel module.
The CPU in my laptop Acer TravelMate 4002WLMi is:
$ cat ...
13
votes
3answers
1k views
How can I set the processor affinity of a process on Linux?
The question is all in the title: How can I set the processor affinity of a process on Linux?
1
vote
3answers
68 views
Was my CPU kinda broken?
Today I've received some message from mcelog utility,
Processor 3 heated above trip temperature. Throttling enabled.
Please check your system cooling. Performance will be impacted
It happens when I ...
2
votes
2answers
260 views
Measuring CPU and Memory per user to distribute “cost” of a server
How should I implement approximately correct per-user monitoring on a server? I want a way to split the cost of a server between the users based on their usage. On newer machines (RHEL6) I would use ...
3
votes
0answers
50 views
Exynos 5 DVFS or turning off cores in Ubuntu - Scaling frequency for one of the cores only (dual core) (cpufreq)
I was wondering if there is possible to scale only one of the cpu cores in the A15 in Exynos 5 ? I have tried using e.g cpufreq-set -c 1 -f 500MHz, but both cores are set to the same frequency. When ...
3
votes
2answers
701 views
Hyperthreading not detected by Linux (now solved)
Problem solved!
After speaking to Dell's support they realized that I had to remove the option acpi=off from my /boot/grub/menu.1st config file. Apparently ACPI support is essential for ...
3
votes
1answer
52 views
How to measure the clock pulse of my computer manually?
My PC has two processors, and I know that each one runs at 1.86 GHz. I have just read about clock cycles and I only have a (very) rough understanding, so I apologize beforehand if my question is so ...
0
votes
0answers
35 views
Prevent Java to escalate CPU usage on Slackware64?
I use Slackware64-current on my work laptop and though I love running Slackware, sometimes it hangs on me near to the point of starting considering falling back to Windows.
I develop on Java and use ...
-1
votes
2answers
64 views
Getting cpu usage same every time.
When I execute following command to get cpu usage , I get nice + user cpu usage.
top -b -n1 | grep "Cpu(s)" | awk '{print $2 + $4}'
Output:
14.5
Here I am getting problem is that the output ...
0
votes
2answers
57 views
Ubuntu 10.04 on 64bit
I need to download the 64bit version of Ubuntu 10.04,
I found this link http://releases.ubuntu.com/lucid/
and select this option:
PC (Intel x86) desktop CD
But it is x86? And the other 64bit ...
1
vote
2answers
58 views
How to bzip a file with minimum cpu percentage?
I am using bzip2 to compress a file,the process takes more that 100% cpu.Is there any way to run bzip2 with minimum CPU precentage.
2
votes
0answers
51 views
Unable to reduce core frequency freebsd
I'm working on a FreeBSD project where I need to maintain the temperature of the processor below a threshold value. In order to reduce the temperature I'm trying to dynamically change the frequency of ...
6
votes
2answers
260 views
Why do I have four CPUs listed in /proc/cpuinfo?
When I bought my Lenovo Thinkpad 520, it had Windows installed. I promptly cleaned that out and installed Fedora 16. I recently visited the /proc/cpuinfo and, much to my surprise, discovered that it ...
1
vote
0answers
68 views
FreeBSD 9,1 - upowerd's cpu consumption off the roof and causes OS to restart
I've been experiencing a really annoying problem with a FreeBSD setup on my laptop. The setup is as follows:
FreeBSD 9.1 / KDE4 desktop / Broadcom wireless 4313 through NDIS / Intel GPU with the new ...
0
votes
3answers
422 views
kswapd0 takes 99% to 100% CPU in RHEL 6.3
I have 5 systems on which I have just installed RHEL6.
System configuration is
CPU-i7
HDD-500 GB
RAM-2 GB
Swap- 4 GB
I have installed the same software's and all the configuration as per old ...
0
votes
1answer
49 views
Does loadavg affect CPU usage?
Does loadavg affect the CPU usage?
Say I see a process consuming 60% of CPU time, both when loadavg (last minute) was 5 and 1, would it be the same?
1
vote
2answers
685 views
Bash script that automatically kills processes when CPU/memory usage gets too high
I have created a script that kills processes if CPU and/or memory usage hits 80%. It creates a list of killed processes when this happens. What can I do to improve it?
while [ 1 ];
do
echo
echo ...
7
votes
3answers
3k views
Why is kworker consuming so many resources on Linux 3.0.0-12-server?
Last Friday I upgraded my Ubuntu server to 11.10, which now runs with a 3.0.0-12-server kernel. Since then the overall performance has dropped dramatically. Before the upgrade the system load was ...
0
votes
0answers
32 views
Problem limiting the resources of a process
I want to limit the memory and cpu a process can use, because it is overloading my PC.
I open a terminal, run ulimit -v 4192000, run the process, open another terminal and run cpulimit -p ...
2
votes
1answer
1k views
i686 versus i486 kernel on an Intel Core i3
I had installed Debian 6 Squeeze on my laptop a couple of weeks ago. Coming from Ubuntu, I did this by downloading the hybrid i386 image and booting it off a USB drive.
Now on GRUB, I'm presented ...
1
vote
1answer
482 views
Running a Snow Leopard 10.6.7 Image on an AMD: The CPU has been disabled by the guest operating system
I am quite frustrated so I have turned to this medium in hoping to get an answer. After reading thousands of forums and trying out various methods (I have lost track what I have tried already) I still ...
1
vote
2answers
148 views
Top c - CPU usage >200% Will it Crash?
I would appreciate some advice from your experience..My main concern is I really REALLY do not want to cause the computer server to crash..
The question is, I am running a program on a linux computer ...
22
votes
1answer
1k views
High CPU usage with CFS?
I asked a previous question to try and isolate the source of an increase in CPU usage when moving an application from RHEL 5 to RHEL 6. The analysis that I did for that seems to indicate that it is ...
6
votes
1answer
184 views
Can I run multiple cores at different clock speeds?
I see the cores on an Intel i5 machine I'm looking at can only be run at the same clockspeed: /sys/devices/system/cpu/cpu1/cpufreq/related_cpus lists all of the CPUs. Setting cpu1's clockspeed changes ...
3
votes
2answers
882 views
How to get information about word, address size, address bus size, data bus size and instruction bus size?
I was wondering how to get information about the following things from the command line in Linux:
word (i.e. the size that the CPU can process at one time, which may not be the OS bit-depth),
...
1
vote
2answers
295 views
How cpu works in conky
I' m trying to setup conky and I saw that I can use from cpu0 to cpu4
CPU0 ${cpu cpu0}% ${cpubar cpu0}
CPU1 ${cpu cpu1}% ${cpubar cpu1}
CPU2 ${cpu cpu2}% ${cpubar cpu2}
CPU3 ${cpu cpu3}% ${cpubar ...
1
vote
2answers
236 views
Kernel not detecting multicore cpu
Kernel Version
3.3.4-5.fc17.x86_64
CPU info:
sashan@dhcp-au-122 ~ $ cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 42
model name : Intel(R) Core(TM) ...
2
votes
2answers
918 views
Top and ps not showing the same cpu result
This is linked to this question.
When I run top I get the following result:
pid 3038 is using 18% cpu, however when running
the result is 5.5%. And this number does not appear to be changing ...
1
vote
2answers
113 views
Monitor single process to logfile perodicly
Based on this question, I would like to log the performance of a specific process, with a frequency of say one second, to a csv (comma separated value) log file.
Something like:
...
1
vote
2answers
251 views
How do I know which processors are physical cores?
I've got an Intel i7 2700k here, and I'd like to know how I can tell which processors are physical and which are virtual (ie: hyperthreading). I'm currently running a Conky script to display my CPU ...
1
vote
1answer
270 views
Which “Processor family” to choose under “Processor type and features”?
I have recently compiled a minimal kernel for my Intel(R) Pentium(R) Dual CPU T3400 @ 2.16GHz, and chose CONFIG_MCORE2 (Core 2/newer Xeon) under "Processor type and features > Processor family"
I ...
1
vote
0answers
275 views
How can a single thread use 200% CPU usage?
From the screenshot above of htop output you can see that mysql is apparently using 204% of CPU usage (this is a CentOS server with dual quad-core Intel Xeons).
However only one core (8) is doing ...
8
votes
1answer
2k views
Isolating cause of higher CPU usage on RHEL 6 vs RHEL 5
I'm currently looking to move our system from RHEL 5 to RHEL 6, but I've run into a snag with unexpectedly high CPU usage on the RHEL 6 machines. It appears that this may be due at least in some part ...
4
votes
3answers
489 views
On Ubuntu Linux, is it normal for mandb to run continuously (apparently in the background)?
I have access to a Ubuntu Linux node at my institution. The nodes are shared among the group, but typically I am the only person who uses this particular node.
I am running a calculation in parallel ...
2
votes
1answer
206 views
System IDLE Time > System Uptime?
I was testing out the linux api while working on something but got stuck on the following output.
[Abhii@localhost net]$ cat /proc/uptime
39135.53 149657.73
As per specs the first number should be ...
4
votes
4answers
424 views
script for logging all the stats for a particular process
I want to monitor CPU usage, disk read/write usage for a particular process, say ./myprocess.
To monitor CPU top command seems to be a nice option and for read and write iotop seems to be a handy ...
7
votes
3answers
4k views
How to check that AES-NI is supported by my CPU?
Howcan I check if my CPU supports the AES-NI instruction set under Linux/UNIX.
2
votes
2answers
520 views
Find the PID of top CPU/MEM usage, save to a shell variable
Is there any way to get the PID of the top CPU/MEM usage, I need to use that in a script, top command doesn't seem to work for it.
2
votes
0answers
196 views
cpufreqd does not control temperature plus shows no output
Since my laptop (an Acer Aspire 5750G running a Gentoo Linux with a not-quite-up-to-date kernel 2.6.39-r3 (a weird wLan hardware makes the update difficult)) tends to run rather hot I am trying to ...
1
vote
2answers
256 views
Putting Linux processes on certain CPU cores [duplicate]
Possible Duplicate:
How can I set the processor affinity of a process on Linux?
Computer CPUs have many cores insde them nowadays.
I have always wondered if there is a way to, when I start ...
5
votes
2answers
389 views
How enable safeguards for CPU temperature
My desktop has a nasty habit. When I have several high intensity applications running and my CPU is at maximum usage for a period of time, the core temperature rises and my computer auto-shuts off.
...
1
vote
4answers
2k views
How to get CPU info on a vmware guest
This is a server that is running on Vmware ESXi:
SERVER:/root # cat /etc/SuSE\-release
SUSE Linux Enterprise Server 11 (x86_64)
VERSION = 11
PATCHLEVEL = 2 ...
1
vote
3answers
139 views
CPU or RAM better in old machine?
I'm planning to use one of two old computers as a low-volume backup server. The machine will be online and files will be backed up over ssh/rsync. I will do a minimal install of Ubuntu or Debian ...
20
votes
2answers
7k views
What do the flags in /proc/cpuinfo mean?
How can I tell whether my processor has a particular feature? (64-bit instruction set, hardware-assisted virtualization, cryptographic accelerators, etc.) I know that the file /proc/cpuinfo contains ...
3
votes
3answers
304 views
Invoking CPU Stress
Looking for an app or tool to invoke CPU usage on my virtual Linux and Unix guests.
I found the app "stress" from a post on Stackoverflow, but curious what the Unix/Linux crowd would recommend.
6
votes
2answers
628 views
Java problem - nearly looks like a virus?
I have a weird problem since about a week. When I wake up my computer from suspend, a java process starts and consumes about 170 % CPU capacity.
I analyzed the java process a bit: it connects to ...
3
votes
1answer
382 views
Do I have PCLMUL instruction set support?
Here are the flags from /proc/cpuinfo:
fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc ...
2
votes
1answer
739 views
CPU and core usage stats
I'm running some programs on a server and I would like to know how much % cpu I'm taking up and how many cores are being utilised by my process.
To clarify, the server has 16 CPUs, all quad-core. I ...
