It will consume as much as you set your max value of your JVM to be. Tomcat by itself does not have any max number that I am aware of - that's something to look up in the online Apache documentation. So if you allocate 12 GB of memory to your system and set your max value of your JVM to be 6 GB, yes your Tomcat instance could reach that maximum value.
Take this next bit of information with a little pinch of salt - it may not be true today. Many years ago, I had heard that each connection when using the Mid-Tier uses about 2 MB of memory. This was many many years ago so that number could well have risen to 10 times that amount. It is something you could try asking BMC Support (Mid-Tier team) if they have a specific number for that for the most current version that you are working on. They probably do have a statistic on that. Joe _____ From: Action Request System discussion list(ARSList) [mailto:[email protected]] On Behalf Of mahmoud mahdy Sent: Thursday, February 27, 2014 6:24 AM To: [email protected] Subject: Re: 7.6.04 midtier Connect settings Dears, suppose that I will increase memory to be doubled and also increase heap. will tomcat double consume the memory for example now tomcat consumes 2GB from 6 GB when double memory to be 12 GB the consumption will be 4GB?. also, what is the maximum concurrent users for Tomcat?. is there any configuration should be done to limit Tomcat memory consumption? _____ Date: Wed, 26 Feb 2014 17:10:53 -0500 From: [email protected] Subject: Re: 7.6.04 midtier Connect settings To: [email protected] ** First off its number of connections not number of users. You could have 100 users, but 20 concurrent connections, not 100. If an additional connection is attempted when all available are used, it will be refused until one is available. To answer your second question about what happens with increasing the number of connection - the direct impact is it would require larger heap size, more memory. For 200 connections, you might need to double your numbers. Joe _____ From: Action Request System discussion list(ARSList) [mailto:[email protected]] On Behalf Of mahmoud mahdy Sent: Wednesday, February 26, 2014 4:21 PM To: [email protected] Subject: 7.6.04 midtier Connect settings Dears, we configured our midtier as below:- configuration tool-> connection settings-> maximum connections per server =80. Please advise what will happen if user number (81) try to connect also, can we increase the value of "maximum connections per server" to be 200 for example and what is the impact?. Note:- we are on 7.6.04 SP4 and Tomcat 6.5 Thanks _ARSlist: "Where the Answers Are" and have been for 20 years_ _ARSlist: "Where the Answers Are" and have been for 20 years_ _ARSlist: "Where the Answers Are" and have been for 20 years_ _______________________________________________________________________________ UNSUBSCRIBE or access ARSlist Archives at www.arslist.org "Where the Answers Are, and have been for 20 years"
