The system tracks this for you. Why not use that? Look at procpsinfo and lwpsinfo which DTrace makes available. man -s 4 proc describes the contents of these as well as others.
Jim --- Benjamin Smedberg wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > I've done some google searches but haven't found an example script for how > to record the amount of CPU time used by a process. > > I'm trying to profile a build system by tracing how many and what kinds of > processes are started. I want to record the following information about > every process within a process tree: > > real start time > real end time > CPU time used > working directory > executable > command line (argv) > > Collecting the real start time/end time/cwd/exectable is fairly simple, I > think I've got it. > > I was thinking that CPU time could be calculated by using vtimestamp: > > collect the vtimestamp at the start and the end of each LWP, and total them > to get the CPU time for the process. However, I'm having trouble with the > proc:::lwp-start probe: it seems to fire in the context of the parent > process, not in the context of the new thread that's starting: > > bsmedberg $ sudo dtrace -s ../process-tree.d -q 32254 > proc:::lwp-start > pid: 32254 > tid: 111341864 > vtimestamp: 96036509 > proc:::create > pid: 32254 > args[0]->pr_pid: 43113 > proc:::lwp-create > pid: 32254 > tid: 111341864 > args[1]->pr_pid: 73060628 > args[0]->pr_lwpid: 74125832 > vtimestamp: 95792715 > proc:::exec-success > pid: 43113 > ppid: 32254 > cwd: obj > curpsinfo->pr_fname: cat > proc:::exit > pid: 43113 > proc:::lwp-exit > pid: 43113 > tid: 74125832 > vtimestamp: 3361917 > > This means I can't simply use lwp-start and lwp-exit and do vtimestamp math, > because the vtimestamp of the lwp-create probe is the vtimestamp of the > shell thread, not the new thread! > > Does anyone have an example script or suggestion how to record the amount of > CPU time a process uses? > > Note: This is MacOS. > > - --BDS > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.5 (Darwin) > Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org > > iD8DBQFJIZ5WSSwGp5sTYNkRAhlnAJ9hMuv00eCD6DSWYFy8BMNPHxTGqgCg4nLa > y3C4zIILmCKS/SFoxjZdUX4= > =R4OP > -----END PGP SIGNATURE----- > _______________________________________________ > dtrace-discuss mailing list > dtrace-discuss@opensolaris.org > > _______________________________________________ dtrace-discuss mailing list dtrace-discuss@opensolaris.org
