RE: CFMX memory usage under load : is this normal?
... but I'm wondering if this is symptomatic of a memory problem/leak somewhere ... No, as long as memory used doesn't increase over time. Dave Watts, CTO, Fig Leaf Software http://www.figleaf.com/ Fig Leaf Software provides the highest caliber vendor-authorized instruction at our training centers in Washington DC, Atlanta, Chicago, Baltimore, Northern Virginia, or on-site at your location. Visit http://training.figleaf.com/ for more information! This email has been processed by SmoothZap - www.smoothwall.net ~| Deploy Web Applications Quickly across the enterprise with ColdFusion MX7 Flex 2 Free Trial http://www.adobe.com/products/coldfusion/flex2/?sdid=RVJU Archive: http://www.houseoffusion.com/groups/CF-Talk/message.cfm/messageid:280170 Subscription: http://www.houseoffusion.com/groups/CF-Talk/subscribe.cfm Unsubscribe: http://www.houseoffusion.com/cf_lists/unsubscribe.cfm?user=89.70.4
Re: CFMX memory usage under load : is this normal?
Yes this is normal. Our busy SPARC server has a 2.5 GB JVM and frees over 600MB when it does a GC. It does this at roughly 30 second intervals or so, like your figures show. On 6/6/07, Terry Ford [EMAIL PROTECTED] wrote: I've never actually paid much attention to CFMX's memory usage before, but I just started monitoring our memory, and I'm a little unsure whether what we're seeing is normal or not. Setup: CFMX6.1, linux ES4, 800MB Xmx. Server averages 30 templates/second. Cached queries set to 0 (same thing happens for different values of cached queries anyway). I'm noticing the same behavior on CF8 pub beta. Monitoring java.lang.Runtime.getRunTime()'s freeMemory() Here's a sample of our free memory output at 5 second intervals: 493mb 356mb 66mb 66mb 59mb 350mb 57mb Over the course of a minute, the free memory value is flying all over the place. It dives down to 50mb or so, and then I assume the GC cleans up and it's back up in the 350+s. Then it drops rapidly back to 50mb, and flies back up again. The app is not doing anything that I'd consider memory intensive. Lots of DB queries, but none are that large memory wise. 100 rows here, 2 rows there, but done many times each minute. There is no notable strain on the server (pages load fast, server load avg is low), but I'm wondering if this is symptomatic of a memory problem/leak somewhere, or if it's completely normal for a loaded server to be allocating and freeing memory at such a frantic pace. -- mxAjax / CFAjax docs and other useful articles: http://www.bifrost.com.au/blog/ ~| ColdFusion MX7 and Flex 2 Build sales marketing dashboard RIAâs for your business. Upgrade now http://www.adobe.com/products/coldfusion/flex2?sdid=RVJT Archive: http://www.houseoffusion.com/groups/CF-Talk/message.cfm/messageid:280198 Subscription: http://www.houseoffusion.com/groups/CF-Talk/subscribe.cfm Unsubscribe: http://www.houseoffusion.com/cf_lists/unsubscribe.cfm?user=11502.10531.4
Re: CFMX memory usage under load : is this normal?
Thanks. I guess the developer in me isn't quite comfortable with so much temporary object creation and destruction. CFMX pools db connections and threads; why not pool query objects, instead of instantiating new ones on each request? Looks like the JRE creates and destroys new query objects for every single request that touches queries, creating lots of memory garbage. Easy to show this by performing queries and printing free allocated mem after each. I would think that a more efficient method would be to have a query object pool that gets allocated once and used by threads on demand (you'd have to bound query result size). That way you could reuse the same query objects and take pressure off the GC. Surely your application doesn't really need to temporarily allocate and free 600MB of memory every 30 seconds? Or is this object-creation-happy use of memory cleaned up by the GC actually more efficient than reuse would? The current usage of memory just seems wrong to me. Yes this is normal. Our busy SPARC server has a 2.5 GB JVM and frees over 600MB when it does a GC. It does this at roughly 30 second intervals or so, like your figures show. On 6/6/07, Terry Ford [EMAIL PROTECTED] wrote: -- mxAjax / CFAjax docs and other useful articles: http://www.bifrost.com.au/blog/ ~| Create robust enterprise, web RIAs. Upgrade integrate Adobe Coldfusion MX7 with Flex 2 http://www.adobe.com/products/coldfusion/flex2/?sdid=RVJP Archive: http://www.houseoffusion.com/groups/CF-Talk/message.cfm/messageid:280200 Subscription: http://www.houseoffusion.com/groups/CF-Talk/subscribe.cfm Unsubscribe: http://www.houseoffusion.com/cf_lists/unsubscribe.cfm?user=11502.10531.4
