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From: | Pádraig Brady |
Subject: | Re: [PATCH] sort: use posix_fadvise to announce access patterns on files opened for reading |
Date: | Tue, 02 Mar 2010 12:08:23 +0000 |
User-agent: | Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.7) Gecko/20100111 Thunderbird/3.0.1 |
On 02/03/10 11:42, Erik Auerswald wrote:
Hi, On Mon, Mar 01, 2010 at 05:33:38PM -0800, Joey Degges wrote:Were you sure to remount your devices to clear the cache before running these tests? While testing this patch early on the cache caused me many incorrect readings. Another approach I took to clear the cache was to fill up all of my RAM with some other process.To clear the caches you can use echo 3> /proc/sys/vm/drop_caches
In my testing I left the inode cache alone for my mechanical disk and used: echo 1 > /proc/sys/vm/drop_caches For spinning the CPU I just used: openssl speed cheers, Pádraig.
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