On Sun, Feb 22, 2009 at 6:13 PM, Rob Beezer <[email protected]> wrote:
>
> Does Sage use some sort of cache or swap space in your home directory
> when working at the Sage command line?
>
> I keep my home directory on a small USB portable notebook hard drive
> and when doing timing experiments with large matrices (25 million
> rational entries on a machine with 8 GB) I get noticeably slower
> results and see more disk activity through the one light on the
> drive. If I run Sage as root, so the home directory is on the system
> disk, performance is more in line with expectations and there's no
> apparent disk activity on my external drive.
Yes, Sage extensively uses $HOME/.sage by default for local disk files, etc.
If you do
export DOT_SAGE=whatever/directory/you/want
it will use that instead.
If you *must* use $HOME/.sage you could at least symlink
$HOME/.sage/temp to /tmp/sage say by typing
cd $HOME/.sage
rm -rf temp
ln -s /tmp/sage temp
William
>
> If this is the case, is there a configuration or environment variable
> to control the location of the disk activity? I haven't been able to
> find anything of the sort.
>
> Thanks in advance,
> Rob
> >
>
--
William Stein
Associate Professor of Mathematics
University of Washington
http://wstein.org
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