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niceload: man example of Ensure enough disk cache

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Ole Tange 2011-07-28 20:14:57 +02:00
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src/niceload.pod
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@ -212,6 +212,21 @@ Run rsync but keep load below 3.4. If load reaches 7 sleep for
B<niceload -L 3.4 -f 12 rsync -Ha /home/ /backup/home/>
=head1 EXAMPLE: Ensure enough disk cache
Assume the program B<foo> uses 2 GB files intensively. B<foo> will run
fast if the files are in disk cache and be slow as a crawl if they are
not in the cache.
To ensure 2 GB are reserved for disk cache run:
B<niceload --hard --run-mem 2g foo>
This will not guarantee that the 2 GB memory will be used for the
files for B<foo>, but it will stop B<foo> if the memory for disk cache
is too low.
=head1 ENVIRONMENT VARIABLES
None. In future versions $NICELOAD will be able to contain default settings.