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perf stat: Display length strings of each run for --table option

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Adding support to display visual aid 'length strings' to easily spot the
biggest difference in time table.

  $ perf stat -r 10 --table perf bench sched pipe
  ...

   Performance counter stats for './perf bench sched pipe' (5 runs):

             # Table of individual measurements:
             5.189 (-0.293) #
             5.189 (-0.294) #
             5.186 (-0.296) #
             5.663 (+0.181) ##
             6.186 (+0.703) ####

             # Final result:
             5.483 +- 0.198 seconds time elapsed  ( +-  3.62% )

Suggested-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20180423090823.32309-9-jolsa@kernel.org
[ Updated 'perf stat --table' man page entry ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jiri Olsa 2018-04-23 11:08:22 +02:00 committed by Arnaldo Carvalho de Melo
parent e55c14af48
commit abc60bad00
2 changed files with 13 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
tools/perf/Documentation/perf-stat.txt
View File

@ -123,14 +123,14 @@ spreadsheets. Columns are separated by the string specified in SEP.
Performance counter stats for 'perf bench sched pipe' (5 runs):
# Table of individual measurements:
5.379 (-0.176)
5.243 (-0.311)
5.238 (-0.317)
5.536 (-0.019)
6.377 (+0.823)
5.189 (-0.293) #
5.189 (-0.294) #
5.186 (-0.296) #
5.663 (+0.181) ##
6.186 (+0.703) ####
# Final result:
5.555 +- 0.213 seconds time elapsed ( +- 3.83% )
5.483 +- 0.198 seconds time elapsed ( +- 3.62% )
-G name::
--cgroup name::

8
tools/perf/builtin-stat.c
View File

@ -1790,9 +1790,15 @@ static void print_table(FILE *output, int precision, double avg)
for (idx = 0; idx < run_count; idx++) {
double run = (double) walltime_run[idx] / NSEC_PER_SEC;
int h, n = 1 + abs((int) (100.0 * (run - avg)/run) / 5);
fprintf(output, " %17.*f (%+.*f)\n",
fprintf(output, " %17.*f (%+.*f) ",
precision, run, precision, run - avg);
for (h = 0; h < n; h++)
fprintf(output, "#");
fprintf(output, "\n");
}
fprintf(output, "\n%*s# Final result:\n", indent, "");