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

Tom Tromey tromey@redhat.com
Wed May 22 20:12:00 GMT 2013


>>>>> "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.

Tom



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