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<== Date ==> <== Thread ==>

Subject: Re: ADSimDetector
From: Michael Davidsaver <mdavidsaver@gmail.com>
To: "Mark S. Engbretson" <Engbretson@anl.gov>
Cc: tech-talk@aps.anl.gov
Date: Fri, 26 May 2017 19:21:01 -0400
On 05/26/2017 12:55 PM, Mark S. Engbretson wrote:
> I have a newer model Xeon computer with 12 real cores, most of which are
> idle at any given moment, and was wondering which plugins may be worth
> committing cores to.

From my experience, I'd advise to think about memory bandwidth as much
as number of cores when working with image data.  Adding more cores
won't help if the bottleneck is access to a shared RAM.

If you haven't encountered it before, the linux 'perf' utility has some
interesting uses for minimally invasive profiling.  IMO 'perf top -p
<pid>' is a must for anyone trying to target code for optimization.

https://lwn.net/Articles/722314/

In some testing I did last winter, I found that most time was being
spent on load/store.  Playing with vector operations and cpu cache hints
had no measurable effect.  I concluded that I'd have done better to
halve the number of cores and buy faster RAM instead.


References:
ADSimDetector Mark S. Engbretson

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