Re: [rfc] lockless pagecache

Benjamin LaHaise
2005-06-27T13:17:10Z

On Mon, Jun 27, 2005 at 06:02:15PM +1000, Nick Piggin wrote:
> However I think for Oracle and others that use shared memory like
> this, they are probably not doing linear access, so that would be a
> net loss. I'm not completely sure (I don't have access to real loads
> at the moment), but I would have thought those guys would have looked
> into fault ahead if it were a possibility.

Shared memory overhead doesn't show up on any of the database benchmarks
I've seen, as they tend to use huge pages that are locked in memory, and
thus don't tend to access the page cache at all after ramp up.

-ben
--
"Time is what keeps everything from happening all at once." -- John Wheeler