More likely you are hitting an OS limit, such as number of processes, number of open files, number of connections, etc.
I have 20 instances of Tomcat running on 4 GB of RAM, and about 800MB stays free.
John
Reynir Hübner wrote:
Hi, I have a server that I am trying to deploy 36 webapplications to. The server is running redhat linux, with 2.5 gig ram and 4 XEON CPUs.
On start up it runs about 30 applications and at that time tomcat failes, with java.lang.OutOfMemoryException. The top function shows many (192) java processes taking about 500 mb of memory, but I have -Xmx1500m and -Xms1g in JAVA_OPTS, so obviously the server is not out of memory. I don't know what is happening, as I have several servers running similar amount of webapps on windows, with out problems.
Other things that run in this server are postgresql and apache (and really nothing else), so nothing is taking up the rest of the memory.
We even tried to write a small java program that takes up memory in a loop, that worked fine, and could take up to 1500mb and then run out of memory.
Am I looking at some kind of a limitation on tomcat (no more than specific amount of applications) or java (no more threads than some specific amount) ?
Please reply, -reynir
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