Exactly what Barney said. It's app and hardware specific. On our servers we run one CF8 instance per server and we're set to handle up to 100 simultaneous requests. Once in a while we hit that limit.
Wil Genovese One man with courage makes a majority. -Andrew Jackson A fine is a tax for doing wrong. A tax is a fine for doing well. On Mar 4, 2009, at 5:35 PM, Barney Boisvert wrote: > > That's a starting point, and needs to be tuned for your specific > application, so it's kind of irrelevant how good of an estimate it is. > I'd say each instance gets (4 * CPUs / instances) to start with, and > then do your tuning from there. And make sure if your instances are > sharing hardware resources that you're loading all the instances that > share the hardware when you test or you'll skew your results. > > That last app I tuned like this we settled on 20 concurrent requests. > We ran one instance per physical machine, and each machine had a > single CPU. About 6 month later we updated the application, retuned, > and optimized to 8 concurrent requests. Then we started doing secure > media delivery and jacked it way up to 50 concurrent requests. So > it's REALLY application specific. > > cheers, > barneyb > > On Wed, Mar 4, 2009 at 3:29 PM, Kris Jones <[email protected]> > wrote: >> >> I've read in various places that the recommended starting point for >> determining the Max Simultaneous Requests (MSR) value is 3-4 per CPU. >> But I'm not seeing how this works in a vertical cluster. Say I have a >> box with 4 CPUs, and 4 instances on that box. How would that suss- >> out? >> >> Do you set each instance to use only it's share of the MSR, or a >> full MSR? >> >> What about a box where the CPUs don't evenly match the number of >> instances? 4 CPUs, 3 instances, as an example. Does this matter? >> >> Cheers, >> Kris >> >> > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| Adobe® ColdFusion® 8 software 8 is the most important and dramatic release to date Get the Free Trial http://ad.doubleclick.net/clk;207172674;29440083;f Archive: http://www.houseoffusion.com/groups/cf-talk/message.cfm/messageid:320124 Subscription: http://www.houseoffusion.com/groups/cf-talk/subscribe.cfm Unsubscribe: http://www.houseoffusion.com/cf_lists/unsubscribe.cfm?user=89.70.4
