On Thu, 2007-03-08 at 17:35 +0000, Gregory Stark wrote:
> When I was running tests I did it on a filesystem where nothing else was
> running. Between tests I unmounted and remounted it. As I understand it Linux
> associates the cache with the filesystem and not the block device and discards
> all pages from cache when the filesystem is unmounted.
On recent Linux kernels, /proc/sys/vm/drop_caches can also be useful:
http://linux.inet.hr/proc_sys_vm_drop_caches.html
You could also use posix_fadvise() to achieve a similar effect on a per-file
basis.
-Neil