Nice, thanks Brian!
On Jun 14, 2010, at 7:39 AM, Brian Bockelman wrote:
Hey Owen, all,
I find this one handy if you have root access:
http://linux-mm.org/Drop_Caches
echo 3 > /proc/sys/vm/drop_caches
Drops the pagecache, dentries, and inodes. Without this, you can
still get caching effects doing the normal "read and write large
files" if the linux pagecache outsmarts you (and I don't know about
you, but it often outsmarts me...).
Brian
On Jun 14, 2010, at 9:35 AM, Owen O'Malley wrote:
Indeed. On the terasort benchmark, I had to run intermediate jobs
that
were larger than ram on the cluster to ensure that the data was not
coming from the file cache.
-- Owen
