Messages in this thread | | | Date | Wed, 20 Aug 2003 15:52:00 -0700 | From | Mike Fedyk <> | Subject | Re: how to turn off, or to clear read cache? |
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On Wed, Aug 20, 2003 at 11:46:28PM +0100, Jamie Lokier wrote: > 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.
Won't that hold a lot of locks, and possibly pause the system until the flushing is complete? Hopefully, in 2.6 this doesn't call lock_kernel... - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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