Re: Profiling a library built with libtool

[Benoit SIGOURE]

On Jul 13, 2007, at 5:36 PM, Joseph Wakeling wrote:

> Benoit SIGOURE wrote:
> > The .la file is a piece of shell script that contains information  
> > useful
> > to libtool.
> >
> > Now the answer to your question is to ask libtool to run gprof (or  
> > gdb)
> > for you:
> > ./libtool --mode=execute gprof ./foo
>
> Ah! That explains much.  Thank you.
>
> I still get results that I don't understand.  This is the beginning of
> what I get for profiling my executable:
>
> -----------------------------------------------------------------
> Flat profile:
>
> Each sample counts as 0.01 seconds.
>  no time accumulated
>
>   %   cumulative   self              self     total
>  time   seconds   seconds    calls  Ts/call  Ts/call  name
>   0.00      0.00     0.00    56133     0.00     0.00  data_start
>   0.00      0.00     0.00       19     0.00     0.00
> MG_sigma2_Theta_threaded
> -----------------------------------------------------------------
>
> There's a record of calls but not of times, and _nothing_ for the
> library functions.  The library and this executable are all built
> together in one big ./configure && make.
>
> I don't know whether I need to do more than add -pg to the CFLAGS when
> building the library or whether it's simply gprof I'm not using  
> correctly.

Hmm you are right, I didn't notice during my test that I also had zeros.
Build a static version of your project and it'll work.

./configure --disable-shared
make clean all CFLAGS='-pg -all-static'

Cheers,

--
Benoit Sigoure aka Tsuna
EPITA Research and Development Laboratory

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