Wow...where to begin...to answer in very general terms... What affects memory usage?
The short answer is everything, and includes the two points you listed below. The long answer is it depends...how many concurrent sessions will each webapp require...what size do you anticipate each session object to be (are the webapps stuffing extra content into the session objects)...what sub-services / resources are required for each webapp (jdbc, etc.), or are these webapps just delivering simple html content...how is session persistence configured...what is the session timeout value set to at the container and/or for each web-app...if there is a HA requirement, then that must be taking into account if clustering is being considered...and the list goes on... You really need to understand each of the webapps anticipated memory footprint (in terms of concurrency, jdbc connectivity, etc.) to adequately answer this question...better to take the time upfront rather than having a client call up complaining about an http-500 (OOM) error... The fact is that the garbage collection algorithms in recent JVM versions do a good job of reclaiming memory, as long as your apps are well-behaved. In summary, IMHO 64mb seems a bit low as a default...with the price of memory I'd push everything up by a factor or two, especially if the server (providing the tomcat service) sole purpose in life is running a single instance of tomcat; of course, it would seem that you need to get agreement from your service provider too :) HTH Rob -----Original Message----- From: Charl Gerber [mailto:[EMAIL PROTECTED] Sent: Tuesday, June 14, 2005 5:33 AM To: tomcat-user@jakarta.apache.org Subject: Tomcat memory question My tomcat instance is now running 10 webapps and will most likely get more, in the region of 15. My service provider configures my server with 64MB heap space. Question is, what affects the memory usage? Purely the number of hits (ie active sessions) or the number of webapps as well? Should my server run ok with 64MB heap memory for say 15 or maybe even 20 webapps? The apps itself are rather small. Thanks. Charl --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
