[Beowulf] Definition of HPC
Max R. Dechantsreiter
max at performancejones.com
Thu Apr 18 13:36:31 PDT 2013
On Thu, 18 Apr 2013, Mark Hahn wrote:
>> What problems?
> performance, of course. drop_caches is really only sane for benchmarking,
> where you want to control for hot/cold caches.
I thought you might know of harmful instances of which I was unaware.
> 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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