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Re: OpenMP support


From: Júlio Hoffimann
Subject: Re: OpenMP support
Date: Wed, 6 Mar 2013 21:57:44 -0300


I think just adding parallel regions won't gain you much if any
performance improvements. In my experience you also need to carefully
profile performance and pin threads to cores to avoid cache conflicts.

FWIW,
    Stefan

Hi Stefan,

I also had the same experience with my old laptop (Core 2 Duo). Indeed, adding parallel regions was irrelevant for performance because of core switching and related issues.

The scenario changes drastically with modern CPUs, my Intel i7 responds a lot different when i add parallel regions. There is effective scalability with 8 cores at hand, not much effort.

Best,
Júlio.

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