Messages in this thread | | | From | Wim Heirman <> | Date | Sat, 14 May 2011 14:49:28 +0200 | Subject | Re: perf-stat per thread results |
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On 14 May 2011 01:02, David Ahern <dsahern@gmail.com> wrote: > > > On 05/13/11 14:32, Wim Heirman wrote: >> Hi, >> >>> It's supposed to do that if --stat is specified, and it used to work - see this >>> commit: >>> >>> 8d51327090ac: perf report: Fix and improve the displaying of per-thread event counters >>> >>> and the output there: >>> >>> # PID TID cache-misses cache-references >>> 4658 4659 495581 3238779 >>> 4658 4662 498246 3236823 >>> 4658 4663 499531 3243162 >>> >>> which appears to be roughly what Wim is asking for, AFAICT. >> >> Thanks, this is exactly what I'm looking for. In 2.6.32 (Ubuntu 10.04) >> it works, although if I use --pid rather than the -- <command> variant >> the first thread seams to be missing. In 2.6.38 (Ubuntu 11.04) the >> first thread is missing in both use cases, and I get one column per >> processor (which in itself is fine). >> >> Regards, >> Wim > > Hmm.... my mileage varies using latest kernel > (446cc6345d3de6571bdd0840f48aca441488a28d) > > $ /tmp/build-perf/perf record --stat -fo /tmp/perf.data -p $(pidof rsyslogd) > ^C[ perf record: Woken up 1 times to write data ] > [ perf record: Captured and wrote 0.007 MB /tmp/perf.data (~308 samples) ] > > $ /tmp/build-perf/perf report -T -i /tmp/perf.data > # Events: 6 cycles > # > # Overhead Command Shared Object Symbol > # ........ ........ ................. .......................... > # > 97.61% rsyslogd libc-2.13.so [.] __libc_disable_asynccancel > 2.39% rsyslogd [kernel.kallsyms] [k] native_write_msr_safe > > > # > # (For a higher level overview, try: perf report --sort comm,dso) > # > # PID TID > > > ie., I do not get the counter values. Specifying the counter with -e > (e.g., -e branch-misses) does not help -- still no counter output.
Is rsyslogd multithreaded? (Or at least, do the non-main threads execute any work during your perf-record measurement) If not, then what you see is consistent with what I'm getting, i.e. everything but the main thread is reported.
Regards, Wim -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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