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authorNamhyung Kim <namhyung.kim@lge.com>2013-01-08 13:39:26 +0400
committerArnaldo Carvalho de Melo <acme@redhat.com>2013-01-24 23:40:19 +0400
commit9b494ea2f5638184bc203a30062b32b9a9a05d9e (patch)
tree0ddbaa8913c7ae232a938f39bed3abd00bb0bb83 /tools/perf/builtin-bench.c
parenteec185ab603fab3b7b5021e840cf4b282c4c7e6b (diff)
downloadlinux-9b494ea2f5638184bc203a30062b32b9a9a05d9e.tar.xz
perf bench: Flush stdout before starting bench suite
perf bench prints header message for bench suite before starting the benchmark. However if the stdout is redirected to a file and bench suite forks child processes this (and possibly other debugging messages too) will be repeated multiple times. $ perf bench sched messaging # Running sched/messaging benchmark... # 20 sender and receiver processes per group # 10 groups == 400 processes run Total time: 0.100 [sec] $ perf bench sched messaging > result.txt $ wc -l result.txt 391 In this file, there were so many "Running sched/messaging benchmark..." lines. This was because stdout is converted to fully-buffered due to the redirection and inherited child processes. Other lines are printed after reaping all those tasks. So fix it by flushing stdout before starting bench suites. Signed-off-by: Namhyung Kim <namhyung@kernel.org> Acked-by: Hitoshi Mitake <h.mitake@gmail.com> Cc: Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp> Cc: Ingo Molnar <mingo@kernel.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1357637966-8216-1-git-send-email-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/builtin-bench.c')
-rw-r--r--tools/perf/builtin-bench.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/tools/perf/builtin-bench.c b/tools/perf/builtin-bench.c
index cae9a5fd2ecf..afd1255a632f 100644
--- a/tools/perf/builtin-bench.c
+++ b/tools/perf/builtin-bench.c
@@ -159,6 +159,7 @@ static void all_suite(struct bench_subsys *subsys) /* FROM HERE */
printf("# Running %s/%s benchmark...\n",
subsys->name,
suites[i].name);
+ fflush(stdout);
argv[1] = suites[i].name;
suites[i].fn(1, argv, NULL);
@@ -225,6 +226,7 @@ int cmd_bench(int argc, const char **argv, const char *prefix __maybe_unused)
printf("# Running %s/%s benchmark...\n",
subsystems[i].name,
subsystems[i].suites[j].name);
+ fflush(stdout);
status = subsystems[i].suites[j].fn(argc - 1,
argv + 1, prefix);
goto end;