off by one for 2009 September 12 (entry 0)

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[Trackback URL for this entry] Sat Sep 12 09:19:34 disabling the caches in Linux:

Sometimes you'd like to disable the file (and other caches) in Linux for performance testing reasons. Well, now you can. Simply:

To drop pagecache only, enter: echo 1 > /proc/sys/vm/drop_caches

2 is dentries and inodes only, and 3 is pagecache, dentries, and inodes. You can easily whip together a little script to drop caches regularly enough to simulate running with no caches.

(This information is also under "drop_caches" in linux/Documentation/filesystems/proc.txt.)

Filed under: technical:kernel


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