Martin Olsson wrote: > Hi, > > If grep through all files in a directory twice, then the first time takes > a lot longer because the second run will have most of the files available > in the "in memory file system cache". > > I want to do some basic performance testing for a scenario involving disk I/O. > I'm wondering if there is a command to purge the file system cache, either > for a specific directory or file (which would be great) or otherwise purge the > whole thing. > > Basically, to create repeatable perf tests and get consistent results I would > like to pin down all the "system state" so that any changes in numbers will > be directly attributable to my code changes. > > Does anyone know such a command to flush the file system cache? > > > > Martin
i think this is what you are after # echo 1 > /proc/sys/vm/drop_caches see http://linux-mm.org/Drop_Caches for more info/options sam tygier -- Ubuntu-devel-discuss mailing list Ubuntu-devel-discuss@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-devel-discuss
