[plug] Windows and Linux SWAP

[Craig Ringer]

> You can use a file for linux swap, but its oh so sloooowwwwww ... in
> comparison with a swap partition.  Its very useful to be able to create
> one on the fly though when you need an extra gig or two of swap.

... like when running montage from ImageMagick on a 1gig dir of JPEGs 
and TIFFs. Any idea why its such a memory gobbling pig? I once had 
montage get OOM-killed for using 2 1/2 GIGS of swap and all my server's 
RAM. 1 Gig of VM is common.

-- 
Craig Ringer
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