[Beowulf] likwid vs stream (after HPCG discussion)

Mikhail Kuzminsky kus at free.net
Sat Mar 19 10:28:41 UTC 2022

Just in the HPCG discussion, it was proposed to use the now widely
used likwid benchmark to estimate memory bandwidth. It gives
excellent estimates of hardware capabilities.

Am I right that likwid uses its own optimized assembler code for each
specific hardware?

If so, it turns out that for the HPC user, stream gives a more
important estimate - the application is translated by the compiler
(they do not write in assembler - except for modules from mathematical
libraries), and stream will give a real estimate of what will be
received in the application.

Mikhail Kuzminsky

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