On 14-08-21, Jeremie Courreges-Anglas wrote: > On Sat, Aug 14 2021, Baptiste Jonglez <[email protected]> wrote: > > Hello, > > Hi Baptiste, long time no see. :)
Hi jca, indeed, good to talk to you :) Sorry for the late reply.
> > I would like to determine the CPU usage of a process on a "real-time"
> > basis. That is, every few seconds (sampling period), I would like to
> > compute its average CPU usage in the previous period.
>
> Looks like a job for getrusage(2) or the CLOCK_PROCESS_CPUTIME_ID clock
> supported by clock_gettime(2).
Thanks for the pointer.
It seems getrusage() and clock_gettime() apply only to the current
process, while I'm more interested in other processes, like top. That is,
I think the right interface to use is kvm_getprocs().
Besides, getrusage() seems to also use p_{u,s,i}ticks, so it would
probably also suffer from the delayed updates of these fields; that being
said, I haven't tested.
Regards,
Baptiste
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