Message-ID: <4207FAB6.4070401@stat.wisc.edu>
Date: 2005-02-08T00:33:23Z
From: Michael Redmond
Subject: How to Speed up R on the G5
In-Reply-To: <D21CD3FF-32CC-4E0E-A20D-C47CCAE0404E@r-project.org>
Simon,
What settings did you change in the compiler lines? I assume this was on
gcc and g77?
Thanks
Mike Redmond
---
Simon Urbanek wrote:
> On Feb 7, 2005, at 10:47 AM, Thomas Lumley wrote:
>
>>> My second question is whether there are ways other than using
>>> --with-blas="-framework vecLib", to take advantage of what I thought
>>> was the power of the G5 (or dual G5s in my case).
>>
>> I haven't found anything very impressive yet (this is on an iMac G5,
>> so with much lower bus speed).
>
>
> Just enabling G5 optimizations without any other aggressive flags gave
> me 30% boost on the code I was testing (on a dual G5 - btw: just in case
> someone didn't know - for computations one R process uses only one
> processor). But I think vecLib should be pretty well optimized by Apple
> already, so I don't know of any much faster BLAS implementation for OS X
> ...
>
> Cheers,
> Simon
>
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