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Re: 27% regression of gcc 4.3 performance on cpu2k6/calculix
- From: "H. J. Lu" <hjl at lucon dot org>
- To: Toon Moene <toon at moene dot indiv dot nluug dot nl>
- Cc: grigory_zagorodnev at linux dot intel dot com, gcc mailing list <gcc at gcc dot gnu dot org>, Diego Novillo <dnovillo at redhat dot com>
- Date: Mon, 15 Jan 2007 15:23:58 -0800
- Subject: Re: 27% regression of gcc 4.3 performance on cpu2k6/calculix
- References: <45ABE866.4000008@moene.indiv.nluug.nl>
On Mon, Jan 15, 2007 at 09:47:34PM +0100, Toon Moene wrote:
> Grigory,
>
> Calculix is a combined C/Fortran program. Did you try to compile the
> Fortran parts with --param max-aliased-vops=<something higher than the
> default 50> ?
>
> Diego up'd the default from 10 to 50 because one (or more) of the
> (Fortran) Polyhedron benchmarks showed a dramatic performance regression.
>
I added --param max-aliased-vops=50 to Fortran. It doesn't make
a difference to Calculix.
H.J.