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Compiler(Hawk)

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Revision as of 23:40, 27 October 2019 by Hpcbjdic (talk | contribs)
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We highly recommend to try as much different compilers as possible and compare the performance of the generated code! If you code according to language standards, this is almost for free but can give you a significant speedup! There is no such thing as an "ideal" compiler! One suites better to application A, one suites better to application B (cf. Best Practice Guide AMD EPYC (Naples)).


Please note that compilers do not use optimization flags by default at the moment. Hence, please refer to Compiler Options Quick Reference Guide and set the respective flags on your own (with znver1 for Naples and znver2 for Rome nodes). foo might also be a source of inspiration w.r.t. optimization flags.


GNU


AOCC


Intel

Please use

<compiler> -march=core-avx2

and do not use

<compiler> -xCORE-AVX2

since the latter might give very bad performance!


PGI

With respect to PGI, we recommend to use

<compiler> -tp=zen -O3