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Subject: Re: [hwloc-users] Patch to disable GCC __builtin_ operations
From: Dave Goodell (goodell_at_[hidden])
Date: 2011-06-08 17:30:34


On Jun 8, 2011, at 4:21 PM CDT, Jeff Squyres wrote:

> Is there a reason we wouldn't disable it in OMPI's hwloc by default?

Performance will be better when left enabled on platforms where the compiler and the architecture are in agreement...

IMO Josh's use case is a bit exotic. He's using one system's compiler as an approximation of an appropriate compiler for another system instead of using a cross compiler or compiling in an identical environment. That viewpoint may or may not be shared by the OMPI developers.

-Dave