• Stephane Eranian's avatar
    perf stat: Add interval printing · 13370a9b
    Stephane Eranian authored
    This patch adds a new printing mode for perf stat.  It allows interval
    printing. That means perf stat can now print event deltas at regular
    time interval.  This is useful to detect phases in programs.
    
    The -I option enables interval printing. It expects an interval duration
    in milliseconds. Minimum is 100ms. Once, activated perf stat prints
    events deltas since last printout. All modes are supported.
    
    $ perf stat -I 1000 -e cycles noploop 10
    noploop for 10 seconds
     #           time             counts events
          1.000109853      2,388,560,546 cycles
          2.000262846      2,393,332,358 cycles
          3.000354131      2,393,176,537 cycles
          4.000439503      2,393,203,790 cycles
          5.000527075      2,393,167,675 cycles
          6.000609052      2,393,203,670 cycles
          7.000691082      2,393,175,678 cycles
    
    The output format makes it easy to feed into a plotting program such as
    gnuplot when the -I option is used in combination with the -x option:
    
    $ perf stat -x, -I 1000 -e cycles noploop 10
    noploop for 10 seconds
    1.000084113,2378775498,cycles
    2.000245798,2391056897,cycles
    3.000354445,2392089414,cycles
    4.000459115,2390936603,cycles
    5.000565341,2392108173,cycles
    Signed-off-by: default avatarStephane Eranian <eranian@google.com>
    Cc: Andi Kleen <ak@linux.intel.com>
    Cc: Ingo Molnar <mingo@elte.hu>
    Cc: Jiri Olsa <jolsa@redhat.com>
    Cc: Namhyung Kim <namhyung.kim@lge.com>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Link: http://lkml.kernel.org/r/1359460064-3060-3-git-send-email-eranian@google.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
    13370a9b
perf-stat.txt 3.91 KB