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Re: BLAS lib performance (was Re: MPI (was Re: BIG libraries ....))

From: Quentin Spencer
Subject: Re: BLAS lib performance (was Re: MPI (was Re: BIG libraries ....))
Date: Thu, 06 Oct 2005 16:07:21 -0500
User-agent: Mozilla Thunderbird 1.0.7-1.1.fc4 (X11/20050929)

Fredrik Lingvall wrote:

I noticed that matlab utilizes that B=A*A' (and A'*A) is symmetric (A*A' only takes half the time to compute compared to A*A). Is this functionality available in octave as well?

I haven't looked at the source code, but I think Octave doesn't do this automatically. I was recently comparing Octave with ATLAS libraries to Matlab, and I discovered that in Octave, Z=X*Y takes the same amount of time as Z=X*X', while in Matlab, the second is faster than the first.


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