On Tue, Jan 20, 2015 at 7:55 PM, William Cohen <wco...@redhat.com> wrote: > I have been experimenting with the libpfm4 perf_example syst_smpl.c > and syst_count.c on a fedora 21. The syst_count executable seems to > work fine with the "-G" (cgroup) option, but the similar syst_smpl > does not seems to work with "-G" option. Is there a know issue with > syst_smpl? Below is the detailed output and comments. > > -Will > > #version of the kernel > [wcohen@santana perf_examples]$ uname -a > Linux santana 3.17.8-300.fc21.x86_64 #1 SMP Thu Jan 8 23:32:49 UTC 2015 > x86_64 x86_64 x86_64 GNU/Linux > > > #the syst_count works fine with "-G" > [wcohen@santana perf_examples]$ sudo ./syst_count -e > instructions:period=1000000 -G > machine.slice/machine-qemu\\x2drawhide\\x2dx86_64.scope > <press CTRL-C to quit before 20s time limit> > # ----- > CPU0 G0 12,772,904 12,772,904 > instructions:period=1000000 (scaling 0.00%, ena=24,464,661, run=24,464,661) > machine.slice/machine-qemu\x2drawhide\x2dx86_64.scope > # ----- > CPU1 G0 0 0 > instructions:period=1000000 (scaling 100.00%, ena=0, run=0) > machine.slice/machine-qemu\x2drawhide\x2dx86_64.scope > # ----- > CPU2 G0 20,742,080 20,742,080 > instructions:period=1000000 (scaling 0.00%, ena=33,956,028, run=33,956,028) > machine.slice/machine-qemu\x2drawhide\x2dx86_64.scope > # ----- > CPU3 G0 0 0 > instructions:period=1000000 (scaling 100.00%, ena=0, run=0) > machine.slice/machine-qemu\x2drawhide\x2dx86_64.scope > # ----- > CPU4 G0 16,856,036 16,856,036 > instructions:period=1000000 (scaling 0.00%, ena=32,670,860, run=32,670,860) > machine.slice/machine-qemu\x2drawhide\x2dx86_64.scope > # ----- > CPU5 G0 12,021,365 12,021,365 > instructions:period=1000000 (scaling 0.00%, ena=18,781,042, run=18,781,042) > machine.slice/machine-qemu\x2drawhide\x2dx86_64.scope > # ----- > CPU6 G0 18,757,928 18,757,928 > instructions:period=1000000 (scaling 0.00%, ena=35,832,328, run=35,832,328) > machine.slice/machine-qemu\x2drawhide\x2dx86_64.scope > # ----- > CPU7 G0 0 0 > instructions:period=1000000 (scaling 100.00%, ena=0, run=0) > machine.slice/machine-qemu\x2drawhide\x2dx86_64.scope > > #the similar syst_smpl fails with the same arguments > [wcohen@santana perf_examples]$ sudo ./syst_smpl -e > instructions:period=1000000 -G > machine.slice/machine-qemu\\x2drawhide\\x2dx86_64.scope > instructions:period=1000000 period=1000000 freq=0 > syst_smpl: cannot attach event instructions:period=1000000: No such file or > directory > > #remove the "-G" option and it works > [wcohen@santana perf_examples]$ sudo ./syst_smpl -e > instructions:period=1000000 > instructions:period=1000000 period=1000000 freq=0 > monitoring on CPU7, session ending in 10s > IIP:0xffffffff811ba233 PID:4518 TID:4518 TIME:564,850,150,917,372 > STREAM_ID:12046 CPU:7 PERIOD:1,000,000 ENA=2,971,666,279 RUN=2,971,666,279 > 1,000,309 instructions:period=1000000 > > IIP:0xffffffff8139cfde PID:4520 TID:4520 TIME:564,850,175,258,219 > STREAM_ID:12046 CPU:7 PERIOD:1,000,000 ENA=2,996,007,161 RUN=2,996,007,161 > 2,000,325 instructions:period=1000000 > > IIP:0xffffffff811cd437 PID:4522 TID:4522 TIME:564,850,176,382,739 > STREAM_ID:12046 CPU:7 PERIOD:1,000,000 ENA=2,997,130,740 RUN=2,997,130,740 > 3,000,340 instructions:period=1000000 > > IIP:0xffffffff811ba61d PID:4525 TID:4525 TIME:564,850,198,925,823 > STREAM_ID:12046 CPU:7 PERIOD:1,000,000 ENA=3,019,673,686 RUN=3,019,673,686 > 4,000,287 instructions:period=1000000 > > 4 samples collected in 0 poll events, 0 lost samples > Do not have a good explanation for this yet given the code looks similar in the two programs. Could you send me the strace output for syst_smpl. And which kernel version are you running?
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