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Re: SPEC regression in perl
- From: Jeffrey A Law <law at redhat dot com>
- To: Andrew Pinski <pinskia at physics dot uc dot edu>
- Cc: gcc List <gcc at gcc dot gnu dot org>
- Date: Tue, 17 Aug 2004 02:45:06 -0600
- Subject: Re: SPEC regression in perl
- Organization: Red Hat, Inc
- References: <15A7FF58-F027-11D8-8FF2-00039351ED8A@physics.uc.edu>
- Reply-to: law at redhat dot com
On Tue, 2004-08-17 at 02:26, Andrew Pinski wrote:
> Jeff I think you change on the 9th:
> 2004-08-09 Jeff Law <law@redhat.com>
>
> * Makefile.in (OBJC-common): Add tree-ssa-threadupdate.c
> (tree-ssa-threadupdate.o): Add dependencies.
> * tree-ssa-threadupdate.c: New file.
> ..., etc.
>
> caused a performance regression in perlbmk in SPEC 2000.
>
> Looking at
> <http://people.redhat.com/dnovillo/spec2000/gcc/individual-run-
> ratio.html>
> I see a big dip around the 9th.
Perl is notoriously flakey -- to the point of running the same binary
with the same inputs varying by 10% without rhyme or reason. In fact,
I've found it's the most useless of all the SPEC tests because of the
inability to get consistent results out of the bloody thing.
I wouldn't mind looking at a specific problem if you can find one, but
I'm not likely to go on what is likely a wild goose chase inside perl.
jeff