How to create, enable, and disable a temporary swap file.

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When I was having some trouble with Mozilla crashing, Bill Kenworthy suggested I experiment with some extra swap, and set me these instructions.

Subject: Re: [expert] Re: Mozilla 0.9.8 MDI / SDI Question
   Date: 04 Aug 2002 06:21:48 +0800
   From: Bill Kenworthy <billk@iinet.net.au>

Try using a temporary swapfile to increase swap and see if the problem goes away - if so your up for a re-partitioning. I regularly run out of swap with gnumeric (often uses over a gig of it) and a quick swapon saves the system from coming to an abrupt halt. Windows dynamic swap is actually a much more system friendly method of handling swap than what linux uses - yes linux is more efficient, but that goes out the window when swap hits the wall!

dd if=/dev/zero bs=1024 count=1024000 of=/extraswap #put it in the root
mkswap /extraswap
swapon /extraswap
swapon -s (for swap usage)
swapoff /extraswap #turn off when not needed as it can slow the system down - will transfer data out of swap on closedown, so make sure there is room first!

Downside is a noticable slowing of the system over a swap partition, but at least its still working! I keep a swapfile around for a quick swapon when needed - but I really must re-partition soon!

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• () RandyKramer - 04 Aug 2002
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