Tomcat 7 64bit maximum memory usage

Question

I'm using tomcat7 32 bit. As I know, it maybe manages maximum 1GB memory usage. I used caching data (ehcache) in my application, and sometimes it causes error "OutOfMemory", the application isn't working. I'm planning to use tomcat7 64bit to increase memory, but I don't know how many GBs does it manage in maximum? How do we configure to change memory of tomcat? Thanks in advance.

Answer 1

The maximum amount of memory is not 'restricted' by tomcat, it is restricted by the JVM + System Architecture / OS.

See these questions/answers for more info:

• Increasing the JVM maximum heap size for memory intensive applications
• Max memory for 64bit Java

This means that you will have to install a 64 bit java runtime environment (and not a 64 bit tomcat). Then adapt the -Xmx settings in your tomcat startup scripts. See e.g.:

• Tomcat FAQ
• Adjusting Memory Settings for Tomcat

=== Edit Sorry I was a bit outdated, there is a prepackaged Tomcat7 64 bit all-in-one tomcat for windows. This does however not mean, that my answer is wrong. The package will just contain a 64 bit JRE. With a 64 bit system and JVM, you will not have to bother about memory limits for many many many years....