On 8/19/13 7:18 AM, Jeroen Demeyer wrote:
I believe (but I welcome other opinions) that, if this new ATLAS is better in other respects, the ATLAS build time doesn't really matter.
But auto-tuning surely doesn't need to be done every time on every machine. I thought there was an easy way to save the architecture definitions.
Is the situation such that before ATLAS was using architecture defaults, but for some reason now it isn't? If that's the case, is it because there aren't architecture defaults in the new ATLAS for these architectures? If there are architecture defaults for machines like John's, and we aren't using them (two big questions to answer, of course), then surely that is a regression. The ATLAS FAQ indicates that auto-tuning is usually worse than using architecture defaults: http://math-atlas.sourceforge.net/faq.html#ArchDef
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