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Date: Mon, 27 May 2013 23:34:01 +0200
From: magnum <>
Subject: Re: OMP for raw formats

On 27 May, 2013, at 21:39 , magnum <> wrote:
> Jim recently enabled OMP for the fast raw formats and that made me enable it for nt2 as well (it was there but disabled). They all work fine on Intel i7 but I see massive performance regressions on AMD hardware, not only XOP/Bull but also older AMD. Even using OMP_NUM_THREADS=1 the speed is terrible. I think we need to revert this or figure out some way to handle it.

I see now Bull's results are better than the older AMD six-core I tried earlier. That one really had awful regression at OMPx1, Bull does not - it just doesn't take off using more cores, which is sad but not that much of a problem.


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