[Beowulf] Definition of HPC
hahn at mcmaster.ca
Thu Apr 18 13:33:50 PDT 2013
> What problems?
performance, of course. drop_caches is really only sane for
benchmarking, where you want to control for hot/cold caches.
otherwise, you're almost certainly better off either letting
the kernel optimize global caching, and/or fix your application
to avoid polluting the cache (O_DIRECT, madvise, etc).
chip vendors could provide a drop_caches for CPUs, too, and it would
also be "non-destructive". afaik, such instructions do exist, and
are always privileged, for basically DOS-based the same reason.
regards, mark hahn.
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