Message-ID: <53F5F436.70704@bath.ac.uk>
Date: 2014-08-21T13:29:26Z
From: Simon Wood
Subject: bam (mgcv) not using the specified number of cores
In-Reply-To: <53F5DDD6.8000006@gmail.com>
Hi Andrew,
Could you provide a bit more information, please. In particular the
results of sessionInfo() and the code that caused this weird behaviour
(+ an indication of dataset size).
best,
Simon
On 21/08/14 12:53, Andrew Crane-Droesch wrote:
> I am getting strange behavior when trying to fit models to large
> datasets using bam. I am working on a 4-core machine, but I think that
> there may be 2 physical cores that the computer uses as 4 cores in some
> sense that I don't understand.
>
> When I run the bam using makeCluster(3), the model runs on one core. But
> when I run it on makeCluster(2), top shoes me that three of my cores are
> taken up to full capacity, and my computer slows down or crashes.
>
> How can I get it to truly run on 2 cores?
>
> I'm on a thinkpad X230, running ubuntu.
>
> Thanks,
> Andrew
>
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--
Simon Wood, Mathematical Science, University of Bath BA2 7AY UK
+44 (0)1225 386603 http://people.bath.ac.uk/sw283