[FFmpeg-cvslog] avutil/timer: show histogram of cpu cycles each run took

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michaelni at gmx.at> | Sun Mar 22 16:11:08 2015 +0100| [0fee509cf5f8452a85113c8a9a9b6e6e990b7f48] | committer: Michael Niedermayer

avutil/timer: show histogram of cpu cycles each run took

The new information is printed at verbose log level and can thus be switched on and off
through the log level

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=0fee509cf5f8452a85113c8a9a9b6e6e990b7f48
---

 libavutil/timer.h |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/libavutil/timer.h b/libavutil/timer.h
index 13a3c8c..f17f76b 100644
--- a/libavutil/timer.h
+++ b/libavutil/timer.h
@@ -69,6 +69,8 @@
         static uint64_t tsum   = 0;                                       \
         static int tcount      = 0;                                       \
         static int tskip_count = 0;                                       \
+        static int thistogram[32] = {0};                                  \
+        thistogram[av_log2(tend - tstart)]++;                             \
         if (tcount < 2                        ||                          \
             tend - tstart < 8 * tsum / tcount ||                          \
             tend - tstart < 2000) {                                       \
@@ -77,9 +79,13 @@
         } else                                                            \
             tskip_count++;                                                \
         if (((tcount + tskip_count) & (tcount + tskip_count - 1)) == 0) { \
+            int i;                                                        \
             av_log(NULL, AV_LOG_ERROR,                                    \
-                   "%"PRIu64" " FF_TIMER_UNITS " in %s, %d runs, %d skips\n",          \
+                   "%"PRIu64" " FF_TIMER_UNITS " in %s, %d runs, %d skips",          \
                    tsum * 10 / tcount, id, tcount, tskip_count);          \
+            for (i = 0; i < 32; i++)                                      \
+                av_log(NULL, AV_LOG_VERBOSE, " %2d", av_log2(2*thistogram[i]));\
+            av_log(NULL, AV_LOG_ERROR, "\n");                             \
         }                                                                 \
     }
 #else