[FFmpeg-devel] Profiling the library

[Thorsten Jordan]

Hello,

i got some more information out of oprofile. The values depend of course
on the input, but maybe it is interesting to the developers as well.
Here is an excerpt. If this is too off-topic or uninteresting, please
tell me - i am new to the list and don't want to be known as spammer.

Discovery HD material 1920x1088, ca. 17.5mbit for Video:

CPU: P4 / Xeon with 2 hyper-threads, speed 3066.9 MHz (estimated)
Counted GLOBAL_POWER_EVENTS events (time during which processor is not
stopped) with a unit mask of 0x01 (mandatory) count 100000
samples  %        app name                 symbol name
641419   16.3455  no-vmlinux               (no symbols)
480138   12.2355  libc-2.5.so              (no symbols)
474999   12.1046  libavcodec.so            decode_cabac_residual
241597    6.1567  libavcodec.so            decode_mb_cabac
181427    4.6234  libavcodec.so            h264_h_loop_filter_luma_mmx2
161359    4.1120  libavcodec.so            fill_caches
129169    3.2917  libavcodec.so            hl_decode_mb_simple
118638    3.0233  libavcodec.so            put_h264_chroma_mc8_mmx
100001    2.5484  libavcodec.so            h264_h_loop_filter_chroma_mmx2
94209     2.4008  libavcodec.so            h264_v_loop_filter_luma_mmx2
79825     2.0342  libavcodec.so            put_h264_qpel8_h_lowpass_l2_mmx2
75998     1.9367  libavcodec.so            put_h264_qpel8or16_v_lowpass_mmx2
74051     1.8871  libavcodec.so            filter_mb_fast
55606     1.4170  libavcodec.so            decode_cabac_mb_mvd
51846     1.3212  libavcodec.so            put_h264_qpel16_mc00_mmx2
45264     1.1535  libavcodec.so            h264_loop_filter_strength_mmx2
42432     1.0813  libavcodec.so            get_cabac_noinline
41434     1.0559  oprofiled                (no symbols)
39429     1.0048  libavcodec.so            h264_v_loop_filter_chroma_mmx2
36018     0.9179  libavcodec.so            ff_h264_idct_add_mmx
35390     0.9019  Xorg                     (no symbols)
34774     0.8862  libavcodec.so            filter_mb_edgev
34472     0.8785  libavcodec.so            filter_mb_edgeh
31097     0.7925  libavcodec.so            mc_part
28953     0.7378  libavcodec.so            clear_blocks_mmx
25934     0.6609  libavcodec.so            hl_motion
25625     0.6530  libavcodec.so            h264_parse



Anixe HD material 1920x1088, ca. 11.2mbit for Video

CPU: P4 / Xeon with 2 hyper-threads, speed 3066.9 MHz (estimated)
Counted GLOBAL_POWER_EVENTS events (time during which processor is not
stopped) with a unit mask of 0x01 (mandatory) count 100000
samples  %        app name                 symbol name
1729288  17.8433  libavcodec.so            decode_cabac_residual
1241987  12.8152  libc-2.5.so              (no symbols)
990787   10.2232  libavcodec.so            decode_mb_cabac
864689    8.9221  no-vmlinux               (no symbols)
618225    6.3790  libavcodec.so            put_h264_qpel8or16_v_lowpass_mmx2
594189    6.1310  libavcodec.so            put_h264_chroma_mc8_mmx
494330    5.1006  libavcodec.so            put_h264_qpel8_h_lowpass_l2_mmx2
484531    4.9995  libavcodec.so            fill_caches
399129    4.1183  libavcodec.so            hl_decode_mb_simple
389900    4.0231  libavcodec.so            decode_cabac_mb_mvd
180724    1.8648  libavcodec.so            get_cabac_noinline
149591    1.5435  libavcodec.so            clear_blocks_mmx
130306    1.3445  libavcodec.so            mc_part
113568    1.1718  libavcodec.so            hl_motion
102844    1.0612  oprofiled                (no symbols)
97346     1.0044  libavcodec.so            ff_h264_idct_add_mmx
92063     0.9499  libavcodec.so            put_h264_qpel8_h_lowpass_mmx2
82303     0.8492  libavcodec.so            ff_h264_idct_dc_add_mmx2
76850     0.7930  libavcodec.so            put_h264_qpel16_mc00_mmx2
55097     0.5685  Xorg                     (no symbols)
51270     0.5290  libavcodec.so            prefetch_mmx2
47297     0.4880  libavcodec.so            decode_slice
38728     0.3996  libavcodec.so            draw_edges_mmx
33169     0.3422  libX11.so.6.2.0          (no symbols)
30026     0.3098  libpthread-2.5.so        pthread_mutex_lock
25970     0.2680  libglib-1.2.so.0.0.10    (no symbols)
24621     0.2540  libavcodec.so            h264_parse


Interesting: decode_cabac_residual uses more cpu on the stream with
lower bitrate.

-- 
Mit freundlichen Gr??en, Thorsten