linux-kernel - [PATCH] perf bench: flush stats when pipe it to a file or to tee

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Date:   Fri, 12 Nov 2021 23:53:12 +0200
From:   Sohaib Mohamed <sohaib.amhmd@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     sohaib.amhmd@...il.com, rickyman7@...il.com, irogers@...gle.com,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Yury Norov <yury.norov@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] perf bench: flush stats when pipe it to a file or to tee

The output of perf bench gets buffered when I pipe it to a file or to
tee, in such a way that I can see it only at the end.

E.g.
$ perf bench internals synthesize -t
< output comes out fine after each test run >

$ perf bench internals synthesize -t | tee file.txt
< output comes out only at the end of all tests >

See, also:
$ perf bench mem all | tee file.txt
$ perf bench sched all | tee file.txt
$ perf bench internals all -t | tee file.txt
$ perf bench internals all | tee file.txt

Suggested-by: Riccardo Mancini <rickyman7@...il.com>
Signed-off-by: Sohaib Mohamed <sohaib.amhmd@...il.com>
---
 tools/perf/bench/find-bit-bench.c | 1 +
 tools/perf/bench/synthesize.c     | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/tools/perf/bench/find-bit-bench.c b/tools/perf/bench/find-bit-bench.c
index 22b5cfe97023..39fb4184fbcb 100644
--- a/tools/perf/bench/find-bit-bench.c
+++ b/tools/perf/bench/find-bit-bench.c
@@ -113,6 +113,7 @@ static int do_for_each_set_bit(unsigned int num_bits)

 		if (use_of_val == accumulator)  /* Try to avoid compiler tricks. */
 			printf("\n");
+		fflush(stdout);
 	}
 	bitmap_free(to_test);
 	return 0;
diff --git a/tools/perf/bench/synthesize.c b/tools/perf/bench/synthesize.c
index 7401ebbac100..d21d311df61b 100644
--- a/tools/perf/bench/synthesize.c
+++ b/tools/perf/bench/synthesize.c
@@ -92,6 +92,7 @@ static int do_run_single_threaded(struct perf_session *session,
 		update_stats(&event_stats, atomic_read(&event_count));
 	}

+	fflush(stdout);
 	time_average = avg_stats(&time_stats);
 	time_stddev = stddev_stats(&time_stats);
 	printf("  Average %ssynthesis took: %.3f usec (+- %.3f usec)\n",
@@ -186,6 +187,7 @@ static int do_run_multi_threaded(struct target *target,
 		perf_session__delete(session);
 	}

+	fflush(stdout);
 	time_average = avg_stats(&time_stats);
 	time_stddev = stddev_stats(&time_stats);
 	printf("    Average synthesis took: %.3f usec (+- %.3f usec)\n",
--
2.25.1