Compile with -fno-omit-frame-pointer on x86_64?
jreiser at bitwagon.com
Wed Nov 3 21:12:05 UTC 2010
On 11/03/2010 01:51 PM, Owen Taylor wrote:
> [ But yes, 4% is a big hit. 1% I would accept without hesitation.
> 4% does make me hesitate a little bit. During devel cycles, we
> accept much more slowdown than that for the debug kernel,
> of course. If we can figure out profiling without frame
> pointers, that would be even better ]
Would you accept an overhead of 1 CPU cycle per subroutine call
(all the time in *ALL* code) plus a few dozen cycles per
subroutine call (perhaps restricted to some subset of routines)
in the pieces that were being profiled at the moment?
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