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SubjectRe: [PATCH v3] perf bench sched pipe: Add -G/--cgroups option
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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