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perf stat: add perf stat -B to pretty print large numbers
It is hard to read very large numbers so provide an option to perf stat
to separate thousands using a separator. The patch leverages the locale
support of stdio. You need to set your LC_NUMERIC appropriately, for
instance LC_NUMERIC=en_US.UTF8. You need to pass -B to activate this
feature. This way existing scripts parsing the output do not need to be
changed. Here is an example.
$ perf stat noploop 2
noploop for 2 seconds
Performance counter stats for 'noploop 2':
1998.347031 task-clock-msecs # 0.998 CPUs
61 context-switches # 0.000 M/sec
0 CPU-migrations # 0.000 M/sec
118 page-faults # 0.000 M/sec
4,138,410,900 cycles # 2070.917 M/sec (scaled from 70.01%)
2,062,650,268 instructions # 0.498 IPC (scaled from 70.01%)
2,057,653,466 branches # 1029.678 M/sec (scaled from 70.01%)
40,267 branch-misses # 0.002 % (scaled from 30.04%)
2,055,961,348 cache-references # 1028.831 M/sec (scaled from 30.03%)
53,725 cache-misses # 0.027 M/sec (scaled from 30.02%)
2.001393933 seconds time elapsed
$ perf stat -B noploop 2
noploop for 2 seconds
Performance counter stats for 'noploop 2':
1998.297883 task-clock-msecs # 0.998 CPUs
59 context-switches # 0.000 M/sec
0 CPU-migrations # 0.000 M/sec
119 page-faults # 0.000 M/sec
4,131,380,160 cycles # 2067.450 M/sec (scaled from 70.01%)
2,059,096,507 instructions # 0.498 IPC (scaled from 70.01%)
2,054,681,303 branches # 1028.216 M/sec (scaled from 70.01%)
25,650 branch-misses # 0.001 % (scaled from 30.05%)
2,056,283,014 cache-references # 1029.017 M/sec (scaled from 30.03%)
47,097 cache-misses # 0.024 M/sec (scaled from 30.02%)
2.001391016 seconds time elapsed
Cc: David S. Miller <davem@davemloft.net>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Tom Zanussi <tzanussi@gmail.com>
LKML-Reference: <4bf28fe8.914ed80a.01ca.fffff5f5@mx.google.com>
Signed-off-by: Stephane Eranian <eranian@google.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Stephane Eranian
Arnaldo Carvalho de Melo
parent
a13c3afd9b
commit
5af52b51f7
2 changed files with 17 additions and 4 deletions
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@ -43,6 +43,9 @@ OPTIONS
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-c::
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scale counter values
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-B::
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print large numbers with thousands' separators according to locale
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EXAMPLES
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--------
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@ -50,6 +50,7 @@
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#include <sys/prctl.h>
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#include <math.h>
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#include <locale.h>
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static struct perf_event_attr default_attrs[] = {
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@ -80,6 +81,8 @@ static pid_t *all_tids = NULL;
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static int thread_num = 0;
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static pid_t child_pid = -1;
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static bool null_run = false;
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static bool big_num = false;
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static int *fd[MAX_NR_CPUS][MAX_COUNTERS];
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@ -377,7 +380,7 @@ static void nsec_printout(int counter, double avg)
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{
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double msecs = avg / 1e6;
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fprintf(stderr, " %14.6f %-24s", msecs, event_name(counter));
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fprintf(stderr, " %18.6f %-24s", msecs, event_name(counter));
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if (MATCH_EVENT(SOFTWARE, SW_TASK_CLOCK, counter)) {
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fprintf(stderr, " # %10.3f CPUs ",
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@ -389,7 +392,10 @@ static void abs_printout(int counter, double avg)
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{
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double total, ratio = 0.0;
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fprintf(stderr, " %14.0f %-24s", avg, event_name(counter));
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if (big_num)
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fprintf(stderr, " %'18.0f %-24s", avg, event_name(counter));
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else
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fprintf(stderr, " %18.0f %-24s", avg, event_name(counter));
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if (MATCH_EVENT(HARDWARE, HW_INSTRUCTIONS, counter)) {
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total = avg_stats(&runtime_cycles_stats);
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@ -426,7 +432,7 @@ static void print_counter(int counter)
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int scaled = event_scaled[counter];
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if (scaled == -1) {
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fprintf(stderr, " %14s %-24s\n",
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fprintf(stderr, " %18s %-24s\n",
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"<not counted>", event_name(counter));
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return;
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}
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@ -477,7 +483,7 @@ static void print_stat(int argc, const char **argv)
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print_counter(counter);
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fprintf(stderr, "\n");
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fprintf(stderr, " %14.9f seconds time elapsed",
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fprintf(stderr, " %18.9f seconds time elapsed",
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avg_stats(&walltime_nsecs_stats)/1e9);
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if (run_count > 1) {
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fprintf(stderr, " ( +- %7.3f%% )",
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@ -534,6 +540,8 @@ static const struct option options[] = {
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"repeat command and print average + stddev (max: 100)"),
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OPT_BOOLEAN('n', "null", &null_run,
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"null run - dont start any counters"),
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OPT_BOOLEAN('B', "big-num", &big_num,
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"print large numbers with thousands\' separators"),
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OPT_END()
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};
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@ -542,6 +550,8 @@ int cmd_stat(int argc, const char **argv, const char *prefix __used)
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int status;
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int i,j;
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setlocale(LC_ALL, "");
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argc = parse_options(argc, argv, options, stat_usage,
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PARSE_OPT_STOP_AT_NON_OPTION);
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if (!argc && target_pid == -1 && target_tid == -1)
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