Mat, I'd not say it's "flawed", just a different beast compared to your prior experience. :-) In a standalone app, you don't likely have more than one user. In a web app, you can have dozens, hundreds, thousands, or tens of thousands.
Consider especially that when you're storing info in sessions, then that is also not "how many people are using the app now", but rather "how many have used it over the timeframe of your session timeout. More than that, many don't realize that sessions are created anew for EVERY PAGE VISIT by a spider or bot, because they tend not to honor the cookie CF provides to track users. So it's not unusual to find CF tracking ten to hundreds times more sessions than you'd expect. If you're on CF 8 or 9 Enterprise or Developer edition, you can see how many sessions there are using the CF Server Monitor's "Active sessions" page, clicking the graph in its top right corner. If on another version of CF, you could use Aussie Mark Lynch's excellent free ServerStats tool. I link to that and discuss this whole problem more at this blog entry: http://www.carehart.org/blog/client/index.cfm/2009/1/22/tracking_count_of_se ssions_per_application Of course, if that link breaks over two lines, please reconnect it before saying it doesn't work. :-) Then consider as well what your session timeout is. The longer it is, and the more stuff you put in the session scope, and the more users/bots that visit, the more memory will be taken for sessions. And this memory cannot be GC'ed until it's no longer in use (the session times out). Sometimes another solution to a problem like this is lowering the session timeout (for the app, in the application.cfc/cfm or in the CF Admin if you rely on its default session timeout setting). Then, too, some go a step further to lower the session timeout specifically for requests that are deemed to spiders/bots. I won't elaborate this here until you know that's your issue and needed solution. Let us know if this info helps, Mat. /charlie arehart char...@carehart.org Providing fast, remote, on-demand troubleshooting services for CF (and CFBuilder) More at http://www.carehart.org/consulting From: cfaussie@googlegroups.com [mailto:cfaussie@googlegroups.com] On Behalf Of Mathew Sayers Sent: Wednesday, August 10, 2011 7:51 AM To: cfaussie@googlegroups.com Subject: RE: [cfaussie] Re: How to load balance I think you're correct because I am using so many session objects the server can't cope with the load; actually it's really only 3 per session but they each hold a collections of other objects; I've used this approach before for java stand alone apps and it has worked really well because the collections are in hashmaps so the memory is indexed; however it seems flawed on a web server because it's eating all the memory. I did find the following link to be really helpful in tuning the jvm and I set a scheduled job to run a runtime and system garbage collection when the heap space reached a 1gb. http://www.coldfusionmuse.com/index.cfm/2008/2/12/leaky.heap.jvm Assuming there is memory available the site works really well; I am looking at new designs; but to buy time I am also wondering about upgrading the server to 64bit and upgrading to CF9 enterprise; any thoughts or tips here? Thanks, Mat _____ From: cfaussie@googlegroups.com [mailto:cfaussie@googlegroups.com] On Behalf Of Mark Mandel Sent: Wednesday, 10 August 2011 12:24 PM To: cfaussie@googlegroups.com Subject: Re: [cfaussie] Re: How to load balance Actually, they said they were using session scope - if your users suddenly ramp up, then that could easily explain the memory leak. Is there anything you could consolidate into a single in memory store in the application scope, rather than having it for every user? Mark On Wed, Aug 10, 2011 at 12:14 PM, daamsie <pe...@travellerspoint.com> wrote: You might want to look into using something other than the CF application scope to cache objects (assuming that's what you're using). We've had pretty good experience using memcached. Though with ehcache now integrated in CF, I'd probably be looking at that instead. Other than that, definitely look at JVM tuning. I'd agree - get someone else who knows it well to help you through that. It will save a lot of guesswork and you'll learn a lot through the process. On Aug 9, 12:26 pm, Mat <mathew.say...@gmail.com> wrote: > Hi All, > > I am new to the group and was hoping someone can help me with a > solution to the following; we have created an application using java > and cold fusion; we do create a lot of Java objects that we hold in > memory at the session level. We are getting an out of memory error; > basically the heap space fills up; server slows to the point that it > crashes. > > First thought is we have a memory leak; I am using jconsole, nice > graphs but what is it really telling me; if anyone knows of a > monitoring tool that will help me see if we have memory that is not > being cleared that should be and what that memory is; would be > appreciated? > > Second thought is we designed the application to hold a lot in memory > to save time hitting the db; I wonder if we are just under resourced. > We are running CF 8,0,1,195765 STD, Java 1.6.0_04, on a Windows 2003 > 32bit Svr. I do have a second server available; does anyone have > instructions on how to setup load balancing so that I can have two > servers sharing the load? > > Any help would be most appreciated? > > Many Thanks, > Mat -- You received this message because you are subscribed to the Google Groups "cfaussie" group. 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