Re: [PATCH v6 0/5] perf stat: Support overall statistics for interval mode

Jiri Olsa
2020-05-20T10:54:16Z

On Wed, May 20, 2020 at 12:27:32PM +0800, Jin Yao wrote:
> Currently perf-stat supports to print counts at regular interval (-I),
> but it's not very easy for user to get the overall statistics.
>
> With this patchset, it supports to report the summary at the end of
> interval output.
>
> For example,
>
> root@kbl-ppc:~# perf stat -e cycles -I1000 --interval-count 2
> # time counts unit events
> 1.000412064 2,281,114 cycles
> 2.001383658 2,547,880 cycles
>
> Performance counter stats for 'system wide':
>
> 4,828,994 cycles
>
> 2.002860349 seconds time elapsed
>
> root@kbl-ppc:~# perf stat -e cycles,instructions -I1000 --interval-count 2
> # time counts unit events
> 1.000389902 1,536,093 cycles
> 1.000389902 420,226 instructions # 0.27 insn per cycle
> 2.001433453 2,213,952 cycles
> 2.001433453 735,465 instructions # 0.33 insn per cycle
>
> Performance counter stats for 'system wide':
>
> 3,750,045 cycles
> 1,155,691 instructions # 0.31 insn per cycle
>
> 2.003023361 seconds time elapsed
>
> root@kbl-ppc:~# perf stat -M CPI,IPC -I1000 --interval-count 2
> # time counts unit events
> 1.000435121 905,303 inst_retired.any # 2.9 CPI
> 1.000435121 2,663,333 cycles
> 1.000435121 914,702 inst_retired.any # 0.3 IPC
> 1.000435121 2,676,559 cpu_clk_unhalted.thread
> 2.001615941 1,951,092 inst_retired.any # 1.8 CPI
> 2.001615941 3,551,357 cycles
> 2.001615941 1,950,837 inst_retired.any # 0.5 IPC
> 2.001615941 3,551,044 cpu_clk_unhalted.thread
>
> Performance counter stats for 'system wide':
>
> 2,856,395 inst_retired.any # 2.2 CPI
> 6,214,690 cycles
> 2,865,539 inst_retired.any # 0.5 IPC
> 6,227,603 cpu_clk_unhalted.thread
>
> 2.003403078 seconds time elapsed
>
> v6:
> ---
> 1. Add comments in perf_evlist__save_aggr_prev_raw_counts.
> 2. Move init_stats(&walltime_nsecs_stats) under interval condition check.
>
> Following patches are changed in v6.
> perf stat: Save aggr value to first member of prev_raw_counts
> perf stat: Report summary for interval mode

Reviewed-by: Jiri Olsa <jolsa@redhat.com>

thanks,
jirka