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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?

viraptor
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7 Answers7

24
top -H -p pid

hope it can help

Jenny D
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liu bluse
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14

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.

EM0
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lexsys
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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.

Mei
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1

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

Sven
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0

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

0

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

Works awesome... little configuration.

fsckin
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0

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
Umut
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