I see! Thank you so much for your help! At2015-08-23 17:34:32,Zhou, Zhenyu<zzy...@pku.org.cn>wrote: > On Sat, 22 Aug 2015 21:36:48 "Zhou, Zhenyu" wrote: > > Thanks a lot! I'm trying to figure out how to set CGroup now - don't > > know it before. > > > > One more question, I just find /proc/[PID]/stat also contains such > > information: > > processCPUTime = utime + stime + cutime + cstime > > > > I'm wondering whether there are any significant differences from > > reading /proc directly and the way Collectd used? > > Collectd is reading from /proc files. So if the processes plugin does > monitor the appropriate stats, then it is reading exactly those files. > > In the case of cgroups, the files being read are located on the cgroups > filesystem (usually somewhere below /sys/fs/cgroup/). > > > So collectd is just automating the data collection for you. Have a look > at the sources to determine where the individual data points are > obtained from. > Local kernel-originated stats are mostly read from /proc, /sys or over > netlink. > > Bruno > > > Thank you! > > > > Zhenyu > > > > At2015-08-22 20:32:29,Zhou, Zhenyu<zzy...@pku.org.cn>wrote: > > > Hello, > > > > > > On Sat, 22 Aug 2015 20:10:25 "Zhou, Zhenyu" wrote: > > > > I'm new to Collectd and would like to use it to measure CPU utilization. > > > > However, after starting the daemon and collecting results, I do not > > > > find CPU utilization for a single process among the .rrd files. I only > > > > find the data for overall system. > > > > > > > > Does anyone have idea how to measure it for one process (according to > > > > its PID)? Or does Collectd support such functionality? > > > > > > The CPU plugin can only monitor per-CPU usage (and eventually a system > > > average). > > > > > > To monitor per-process usage you might be able to use process plugin > > > (not sure) or cgroups (place the process you want to monitor in its own > > > cgroup for CPU accounting and use cgroup plugin). > > > > > > Bruno > > >
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