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Re: CUDA in Octave 322

From: Andreas Romeyke
Subject: Re: CUDA in Octave 322
Date: Fri, 11 Sep 2009 15:05:18 +0200


Am Fri, 11 Sep 2009 14:15:04 +0200
schrieb Thomas Ilnseher <address@hidden>:

> Problem here is that you have to  copy data to the GPU's memory nad
> back, call the GPU and so on. This probably gives a reasonable
> overhead, so you'd only accelerate things this way when operating
> with *LARGE* vectors / matrices.

Nope, you would only accelerate things this way when *heavily*
operating on vectors/matrices. The bottleneck is the data transfer
between GPU and CPU. There are limits in branching, there are limits in
jumping or random access the video memory.

Bye andreas

Software Developer / Dipl. Inform. (FH)
Max Planck Institute for Human Cognitive and Brain Sciences
Department of Psychology
Stephanstr. 1a, 04103 Leipzig, Germany

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