Re: Crashing a lot when running with jprof

On Wednesday 2008-02-27 22:04 -0500, dolphinling wrote:
> L. David Baron wrote:
> > It doesn't help if your system libraries are compiled with
> > -fomit-frame-pointer, which I think is likely to be the case on
> > x86_64.  (Although with gentoo maybe it's used everywhere.  Can you
> > check?)
> 
> They are (not by default, but it's one of the most common settings, since it's 

Then jprof as written now isn't going to work for you, since it
depends on the frame pointer being saved in every stack frame for
stack traversal.

> > And the glibc backtrace() stack walking code didn't work across
> > signal handlers, last I tried, so that wouldn't help here either.
> 
> This bit is over my head--is there something I can try contained in that sentence?

It's about a potential fix to jprof that I once tried but that
didn't work for me.  However, that fix would also seriously degrade
the performance characteristics of jprof since backtrace() is much
slower than jprof's frame pointer walking code.

-David

-- 
L. David Baron                                 http://dbaron.org/
Mozilla Corporation                       http://www.mozilla.com/