[Beowulf] [EXTERNAL] Re: Deskside clusters
hearnsj at gmail.com
Sun Sep 19 11:02:10 UTC 2021
Eadline's Law : Cache is only good the second time.
On Fri, 17 Sep 2021, 21:25 Douglas Eadline, <deadline at eadline.org> wrote:
> > Where I disagree with you is (3). Whether or not cache size is important
> > depends on the size of the job. If your iterating through data-parallel
> > loops over a large dataset that exceeds cache size, the opportunity to
> > reread cached data is probably limited or nonexistent. As we often say
> > here, "it depends". I'm sore someone with better low-level hardware
> > knowledge will pipe in and tell me why I'm wrong (Cunningham's Law).
> Of course it all depends. However, as core counts go up, a
> fixed amount of cache must get shared. Since the high core counts
> are putting pressure on main memory BW, cache gets more
> important. This is why AMD is doing V-cache for new processors.
> Core counts have outstripped memory BW, their solution
> seems to be big caches. And, cache is only good the second time :-)
> -- big snip--
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