We aren't after average HPC programmers... Even good compilers (Intel) are very very limited in their optimisations. We got factors of 2x and 3x by hand writing SSSE3 commands on standard Xeon's rather than let the compiler do its thing... Compiler limitations isn't particular to Phi.
On Wed, Jun 20, 2018 at 2:47 AM Prentice Bisbal <pbis...@pppl.gov> wrote: > > If you organize your code correctly, and call the compiler with the right > optimization flags, shouldn't the compiler automatically handle a good > portion of this 'low-level' stuff? I understand that hand-coding this stuff > usually still give you the best performance (See GotoBLAS/OpenBLAS, for > example), but does your average HPC programmer trying to get decent > performance need to hand-code that stuff, too? > > > -- Dr Stuart Midgley sdm...@gmail.com
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