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| author | Stephane Eranian <eranian@google.com> | 2011-08-15 22:22:33 +0200 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2011-08-18 07:46:13 -0300 |
| commit | 4aa9015f8bfd2c8d7cc33a360275b71a9d708b37 (patch) | |
| tree | 868d22562ba20ed87698e69cf33d29cce19764fb /tools/perf/Documentation | |
| parent | e71a059832753a8834a5a5080366879954ccdc4d (diff) | |
| download | linux-4aa9015f8bfd2c8d7cc33a360275b71a9d708b37.tar.gz linux-4aa9015f8bfd2c8d7cc33a360275b71a9d708b37.tar.bz2 linux-4aa9015f8bfd2c8d7cc33a360275b71a9d708b37.zip | |
perf stat: Add -o and --append options
This patch adds an option (-o) to save the output of perf stat into a
file. You could do this with perf record but not with perf stat.
Instead, you had to fiddle with stderr to save the counts into a
separate file.
The patch also adds the --append option so that results can be
concatenated into a single file across runs. Each run of the tool is
clearly separated by a comment line starting with a hash mark. The -A
option of perf record is already used by perf stat, so we only add a
long option.
$ perf stat -o res.txt date
$ cat res.txt
Performance counter stats for 'date':
0.791306 task-clock # 0.668 CPUs utilized
2 context-switches # 0.003 M/sec
0 CPU-migrations # 0.000 M/sec
197 page-faults # 0.249 M/sec
1878143 cycles # 2.373 GHz
<not supported> stalled-cycles-frontend
<not supported> stalled-cycles-backend
1083367 instructions # 0.58 insns per cycle
193027 branches # 243.935 M/sec
9014 branch-misses # 4.67% of all branches
0.001184746 seconds time elapsed
The option can be combined with -x to make the output file much easier
to parse.
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20110815202233.GA18535@quad
Signed-off-by: Stephane Eranian <eranian@google.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/Documentation')
| -rw-r--r-- | tools/perf/Documentation/perf-stat.txt | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/tools/perf/Documentation/perf-stat.txt b/tools/perf/Documentation/perf-stat.txt index 918cc38ee6d1..08394c4879a8 100644 --- a/tools/perf/Documentation/perf-stat.txt +++ b/tools/perf/Documentation/perf-stat.txt @@ -94,6 +94,13 @@ an empty cgroup (monitor all the time) using, e.g., -G foo,,bar. Cgroups must ha corresponding events, i.e., they always refer to events defined earlier on the command line. +-o file:: +-output file:: +Print the output into the designated file. + +--append:: +Append to the output file designated with the -o option. Ignored if -o is not specified. + EXAMPLES -------- |