From help-octave-request at bevo dot che dot wisc dot edu Wed Jan 15 03:11:31 2003
Subject: Re: multi-threaded octave?
From: Per Persson <persquare at mac dot com>
To: "Shahbaz Chaudhary" <chaudhar at umich dot edu>
Cc: help-octave at bevo dot che dot wisc dot edu
Date: Wed, 15 Jan 2003 10:11:11 +0100


On onsdag, jan 15, 2003, at 02:06 Europe/Stockholm, Shahbaz Chaudhary 
wrote:

> BTW, if I run octave on Apple's g4...will their vector technology
> significantly speed up octave?  Thanks.

Presently the G4 vector instructions doesn't support double precision 
numbers per se but some nifty coding in Apple's vecLib gives a decent 
speed up of BLAS-routines.

Linking with vecLib is the default behaviour for octave on OS X, but 
unfortunately vecLib isn't multithreaded so if you have 2 CPU's you 
might want to use ATLAS instead. I did some tests a while back on a 
G4MP which indicated that vecLib was best for a single CPU and ATLAS 
for MP-machines.

Note that the above only applies to the BLAS/LAPACK routines, gcc 
doesn't perform any automatic vectorization of the code on a G4.

/Per



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