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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?

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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.

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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.

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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 9 '09 at 12:41
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Maybe have a look at htop, you can configure quite a lot with it.

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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 9 '09 at 12:37
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Did you tried sar? It can fetch a lot of information even on pid level.

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

Works awesome... little configuration.

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