[FFmpeg-devel] Profiling the library

[Thorsten Jordan]

Luca Barbato schrieb:
> Thorsten Jordan wrote:
>> Hello,
>>
> Use valgrind to get a nice callgraph (that could also be visualized in a
> quite good way by kcachegrind)
> use oprofile to get performance data for the code (I'd suggest you to
> check cache miss)
Thanks for this information, it seems that the alternative gprof can't
be used anyway, because when i recompile ffmpeg (SVN tarball of 30min
ago) with my gcc (4.1.3 20070429 (prerelease) (Debian 4.1.2-6)), i get
this (configure with --enable-gprof):

h264.c: At top level:
cabac.h:109: warning: ?put_cabac_static? defined but not used
cabac.h:155: warning: ?put_cabac_terminate? defined but not used
cabac.h:183: warning: ?put_cabac_u? defined but not used
cabac.h:218: warning: ?put_cabac_ueg? defined but not used
cabac.h:270: warning: ?refill2? defined but not used
cabac.h:808: warning: ?get_cabac_u? defined but not used
cabac.h:824: warning: ?get_cabac_ueg? defined but not used
cabac.h: In function ?get_cabac_noinline?:
cabac.h:522: error: can't find a register in class ?GENERAL_REGS? while
reloading ?asm?

i dont know what the -pg option has to do with assembler register usage,
but it works without the --enable-gprof in configure.

-- 
Regards, Thorsten