[GDB 7.6/GCC 4.8.0] Slowdown in GDB macro processing for cores?

Paul Smith psmith@gnu.org
Wed May 22 21:02:00 GMT 2013


On Wed, 2013-05-22 at 14:12 -0600, Tom Tromey wrote:
> >>>>> "Paul" == Paul Smith <psmith@gnu.org> writes:
> 
> Paul> The interesting thing is both versions are constantly seeking and
> Paul> reading to exactly the same location, over and over again.  However GDB
> Paul> 4.6 does it many times more than GDB 7.5.1.  For example, I get this
> Paul> combo:
> 
> Paul> 14:51:34.423582 lseek(7, 26763264, SEEK_SET) = 26763264 <0.000004>
> Paul> 14:51:34.423609 read(7,
> Paul> "P\361\236\0\0\0\0\0`\361\236\0\0\0\0\0p\361\236\0\0\0\0\0\200\361\236\0\0\0\0\0"...,
> Paul> 4096) = 4096 <0.000015>
> 
> A backtrace from one of these seeks or reads might be useful.
> 
> Or, gprof.

FYI this seems pretty real so I filed a bug:

http://sourceware.org/bugzilla/show_bug.cgi?id=15519




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