Issue sync first, to flush dirty pages back to the backing store

sync

Issue this command to invalidate the cache

echo 3 > /proc/sys/vm/drop_caches

This kernel.org page has an interesting list of the various settable values for the linux page cache. http://www.kernel.org/doc/Documentation/sysctl/vm.txt

drop_caches

Writing to this will cause the kernel to drop clean caches, dentries and
inodes from memory, causing that memory to become free.

To free pagecache:
	echo 1 > /proc/sys/vm/drop_caches
To free dentries and inodes:
	echo 2 > /proc/sys/vm/drop_caches
To free pagecache, dentries and inodes:
	echo 3 > /proc/sys/vm/drop_caches

I need to send a MIME encoded email ( a png file) to myself. uuencoded files no longer play well with Outlook 2011 on Mac (no idea why). Thankfully we can replace mailx with mutt to do the MIME encoding for us

diskperf-3650-2:[/tmp] $ mutt -s “From mutt” -a /u/little/charts/spc1_csc_cam.png little@netapp.com

Mutt requires the < /dev/null to avoid going into interactive mode. Presumably it checks to see if input is from stdin and goes interactive if it is. The redirection could also point to some boilerplate text “This is the chart you requested” but redirecting