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Chris Samuel csamuel at vpac.orgFri May 1 15:59:06 PDT 2009
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----- "John Hearns" <hearnsj at googlemail.com> wrote: > A commercial compiler - Intel / Pathscale /Portland > will always give you better performance from an application. The feedback from a number of our users on our Barcelona/ Shanghai cluster is that GCC beats the Intel compilers hands down [1] and that the PGI ones don't tend to hold a significant margin over GCC either. Interestingly using the -march=amdfam10 option in GCC 4.3.3 to emit Barcelona specific optimisations produces real application code that runs slower than the standard optimisation options (confirmed by a couple of users). I've built GCC 4.4.0, but we've not tested with it (or announced it to users) yet. [1] - Not surprising, it's hardly their home turf. ;-) cheers, Chris -- Christopher Samuel - (03) 9925 4751 - Systems Manager The Victorian Partnership for Advanced Computing P.O. Box 201, Carlton South, VIC 3053, Australia VPAC is a not-for-profit Registered Research Agency
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