Messages in this thread | | | Date | Wed, 18 Jan 2017 13:44:46 +0100 | From | Jiri Olsa <> | Subject | Re: [PATCH 07/11] perf, tools: Collapse identically named events in perf stat |
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On Tue, Jan 03, 2017 at 07:08:29AM -0800, Andi Kleen wrote: > From: Andi Kleen <ak@linux.intel.com> > > The uncore PMU has a lot of duplicated PMUs for different subsystems. > When expanding an uncore alias we usually end up with a large > number of identically named aliases, which makes perf stat > output difficult to read. > > Automatically sum them up in perf stat, unless --no-merge is specified. > > This can be default because only the uncores generally have duplicated > aliases. Other PMUs have unique names. > > Before: > > % perf stat --no-merge -a -e unc_c_llc_lookup.any sleep 1 > > Performance counter stats for 'system wide': > > 694,976 Bytes unc_c_llc_lookup.any > 706,304 Bytes unc_c_llc_lookup.any > 956,608 Bytes unc_c_llc_lookup.any > 782,720 Bytes unc_c_llc_lookup.any > 605,696 Bytes unc_c_llc_lookup.any > 442,816 Bytes unc_c_llc_lookup.any > 659,328 Bytes unc_c_llc_lookup.any > 509,312 Bytes unc_c_llc_lookup.any > 263,936 Bytes unc_c_llc_lookup.any > 592,448 Bytes unc_c_llc_lookup.any > 672,448 Bytes unc_c_llc_lookup.any > 608,640 Bytes unc_c_llc_lookup.any > 641,024 Bytes unc_c_llc_lookup.any > 856,896 Bytes unc_c_llc_lookup.any > 808,832 Bytes unc_c_llc_lookup.any > 684,864 Bytes unc_c_llc_lookup.any > 710,464 Bytes unc_c_llc_lookup.any > 538,304 Bytes unc_c_llc_lookup.any > > 1.002577660 seconds time elapsed > > After: > > % perf stat -a -e unc_c_llc_lookup.any sleep 1 > > Performance counter stats for 'system wide': > > 2,685,120 Bytes unc_c_llc_lookup.any > > 1.002648032 seconds time elapsed
if one of them is not supported, we get wrong output:
[jolsa@krava perf]$ sudo ./perf stat --no-merge -a -e clockticks sleep 1
Performance counter stats for 'system wide':
<not supported> clockticks 4,925,158 clockticks
1.000982200 seconds time elapsed
[jolsa@krava perf]$ sudo ./perf stat -a -e clockticks sleep 1
Performance counter stats for 'system wide':
<not supported> clockticks
1.000850195 seconds time elapsed
jirka
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