Getting a per thread cpu stats

Question

I'm interested in the current usage of cpu - precisely cpu% and wait% - for each thread in a specific application. Is it possible to get that information from somewhere?

I know that top can split information per real thread (ones with pid), but it doesn't show the system/user/wait cpu usage split for each of them. I would also like some way to log that info. Do you know any apps (or apis) that can do that?

score 22 · Answer 1 · edited Dec 05 '17 at 14:56

22

top -H -p pid

hope it can help

edited Dec 05 '17 at 14:56

Jenny D

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answered Dec 05 '17 at 13:12

liu bluse

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score 13 · Answer 2 · edited Nov 08 '19 at 16:18

13

Percent of cpu usage per thread you can get with ps command:

 ps -emo %cpu,pid,user,args

The way it is calculated is described in ps manpage:

Currently, it is the CPU time used divided by the time the process has been running (cputime/realtime ratio), expressed as a percentage.

edited Nov 08 '19 at 16:18

EM0

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answered Jul 09 '09 at 11:31

lexsys

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I'm really interested in both cpu time and io-wait time. ps can't handle the second one unfortunately. – viraptor Jul 09 '09 at 12:41
note to self: replace -e by -C java and pid by spid for thread Ids in java app – kellogs Jan 25 '15 at 11:12
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greater note to self: `ps -To pcpu,tid -C java | sort -r -k1 | more` for hog threads in a java app. `ps --sort=pcpu` achieves nothing; better rely on shell for the sorting part. – kellogs Jan 25 '15 at 11:35
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Very useful @kellogs, thanks. I would add `-n` or `-g` to sort, so that "10" shows up above "2", for example. – EM0 Nov 08 '19 at 10:19

score 5 · Accepted Answer · answered Jul 09 '09 at 14:53

5

I'd look into SystemTap. This tool will certainly give you what you want. There is this example of profiling threads; don't know if it has all you want, but you could modify it so that it does.

answered Jul 09 '09 at 14:53

Mei

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score 0 · Answer 4 · answered Apr 12 '10 at 18:45

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Did you tried sar? It can fetch a lot of information even on pid level.

answered Apr 12 '10 at 18:45

score 0 · Answer 5 · answered Apr 12 '10 at 19:14

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Nagios and PNP http://docs.pnp4nagios.org/pnp-0.4/start

Works awesome... little configuration.

answered Apr 12 '10 at 19:14

fsckin

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score 0 · Answer 6 · answered Jul 09 '09 at 11:30

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Maybe have a look at htop, you can configure quite a lot with it.

answered Jul 09 '09 at 11:30

Sven

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unfortunately it cannot split the cpu on user/system/wait time for a specific thread - only for the whole machine – viraptor Jul 09 '09 at 12:37
Yes, but how would I go about doing that? – rmobis Feb 04 '19 at 18:48

score 0 · Answer 7 · answered Mar 25 '15 at 12:46

I have stumbled on this on a embedded system where we don't have the fancy tools to look in to this stuff.

For this, I have used cpuacct cgroup and placed each thread into its own folder. This way I was able to measure their usage.

Hierarchy was looking like this:

my-app.service
|-tid1
|-tid2
|-tid3

Then I changed it to

my-app.service
|-dir1
|  -tid1
|-dir2
|  -tid2
|-dir3
|  -tid3

Getting a per thread cpu stats

7 Answers7

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