Messages in this thread | | | Date | Wed, 20 Aug 2003 23:46:28 +0100 | From | Jamie Lokier <> | Subject | Re: how to turn off, or to clear read cache? |
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Denis Vlasenko wrote: > On 20 August 2003 14:52, Sergey Spiridonov wrote: > > I need to make some performance tests. I need to switch off or to clear > > read cache, so that consequent reading of the same file will take the > > same amount of time. > > umount/mount cycle will do it, as well as intentional OOMing the box > (from non-root account please;)
umount/mount is impractical when you're testing performance on a big filesystem, which is always being used (e.g. /home).
I'm fairly sure that -o remount used to have this side effect, in fact I used it quite a lot for that purpose, so it should be possible to make it work again, or add a -o flushcache option.
-- Jamie
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