On Thu, Dec 15, 2011 at 2:55 PM, Ewan Mellor <ewan.mel...@eu.citrix.com> wrote: > Your simulation is of the one case that I said would work: when you have > enough RAM to cache the entire image. > > When you _don't_ have enough RAM, then the images will just immediately be > evicted, and the performance with the cache will be worse, not better. This > break point is going to be when your cloud has ~20 gold images, which doesn't > sound very many to me.
I'll go ahead and benchmark it on some real world systems and get some hard numbers so we can discuss facts over opinions. If it turns out that turning off the default cache flushing behaviour leads to an increase in performance and throughput for a very common use case (as I believe I have described in this thread...) I hope you won't mind having a switch to control the cache flush behaviour... Cheers, -jay _______________________________________________ Mailing list: https://launchpad.net/~openstack Post to : openstack@lists.launchpad.net Unsubscribe : https://launchpad.net/~openstack More help : https://help.launchpad.net/ListHelp