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List:       oprofile-list
Subject:    Re: How well does call graph profiling actually work?
From:       John Ruttenberg <rutt () ruttenberg ! org>
Date:       2007-04-30 19:07:10
Message-ID: 17974.15966.123324.7565 () weegee ! hollyrd
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I tried -fno-omit-frame-pointer -O0 in a python compile.  The result has no
callgraph profile that I can make out.  opgprof just dumps a flat graph.  The
opgprof -cl  result is full of entries which look like this:

    0              0  python                   Py_Main
      38863    100.000  {root}                   (no symbols)
      0              0  python                   Py_Main [self]

Jason Yeh:
> John,
> 
> You might want to make sure that the code is compiled with frame 
> pointer. Please see 
> http://oprofile.sourceforge.net/doc/internals/logging-stack.html for 
> more info.
> 
> Jason
> 
> John Ruttenberg wrote:
> > I've been trying to use it on x86-64 without much luck.  The profiles all show
> > functions which are their own callers and have no other callees.
> >
> > I'd like to blame redhat, but I've pretty much convinced myself that they are
> > innocent this time.
> >
> > Does it work well on i386 linux?  What was the earliest version of linux which
> > included working support?
> >
> > I'm going to try to submit a more formal bug for this, but first I wanted to
> > ask what might be a FAQ.
> >
> > Thanks.
> >
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> 
> 

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