Messages in this thread | | | Date | Mon, 16 Oct 2023 17:34:59 -0300 | From | Arnaldo Carvalho de Melo <> | Subject | Re: [PATCH v3] perf bench sched pipe: Add -G/--cgroups option |
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Em Mon, Oct 16, 2023 at 12:55:33PM -0300, Arnaldo Carvalho de Melo escreveu: > Em Mon, Oct 16, 2023 at 12:51:52PM -0300, Arnaldo Carvalho de Melo escreveu: > > Now back at testing with with cgroups.
> Humm, even without the -G I get:
> [root@five ~]# perf stat -e context-switches,cgroup-switches perf bench sched pipe -l 10000 > # Running 'sched/pipe' benchmark: > # Executed 10000 pipe operations between two processes
> Total time: 0.082 [sec]
> 8.246400 usecs/op > 121265 ops/sec
> Performance counter stats for 'perf bench sched pipe -l 10000':
> 20,002 context-switches > 20,002 cgroup-switches
Same number, but then I forgot to add the 'taskset -c 0' part of the command line, if I have it:
[root@five ~]# perf stat -e context-switches,cgroup-switches taskset -c 0 perf bench sched pipe -l 10000 # Running 'sched/pipe' benchmark: # Executed 10000 pipe operations between two processes
Total time: 0.072 [sec]
7.231500 usecs/op 138283 ops/sec
Performance counter stats for 'taskset -c 0 perf bench sched pipe -l 10000':
20,002 context-switches 3 cgroup-switches
0.082855113 seconds time elapsed
0.007765000 seconds user 0.074020000 seconds sys
[root@five ~]# perf stat -e context-switches,cgroup-switches taskset -c 0 perf bench sched pipe -l 10000 -G AAA,BBB # Running 'sched/pipe' benchmark: # Executed 10000 pipe operations between two processes
Total time: 0.093 [sec]
9.341800 usecs/op 107045 ops/sec
Performance counter stats for 'taskset -c 0 perf bench sched pipe -l 10000 -G AAA,BBB':
20,004 context-switches 20,003 cgroup-switches
0.103436330 seconds time elapsed
0.018109000 seconds user 0.063058000 seconds sys
[root@five ~]#
I.e. it works as in your results, but can you please spell out why that 'taskset -c 0' is needed to get these results?
I wasn't expecting the same number of cgroup-switches when not using 'taskset -c 0' :-\
- Arnaldo
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