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This article mainly shows you "Tomcat how to increase heap memory", the content is easy to understand, clear, hope to help you solve your doubts, the following let the editor lead you to study and learn "Tomcat how to increase heap memory" this article.

Tomcat memory configuration

Tomcat is configured by adding a setenv.sh file to the bin directory under tomcat.

You can then configure the memory allocated to tomcat by writing the following environment variables in the setenv file.

Example:

1. Setenv.sh

Export JAVA_OPTS= "- sever-Xms128m-Xmx512m"

Example 2:

2. Setenv.sh

JAVA_OPTS= "- Djava.awt.headless=true-Dfile.encoding=UTF-8

-server-Xms1536m-Xmx1536m

-XX:NewSize=256m-XX:MaxNewSize=256m-XX:PermSize=256m

-XX:MaxPermSize=256m-XX:+DisableExplicitGC "

In general, just set the-Xmx to 60% of the operating system memory.

-Xms

-Xmx

-XX:PermSize-Set initial PermGen Size.

-XX:MaxPermSize-Set the maximum PermGen Size.

-Xms and-Xmx are used to control Heap Size, which, to put it bluntly, is the memory allocated to applications running in Tomcat. The default-Xms is physical memory 1 to 64, and XMX is 1 to 4.

-XX:PermSize and-- XX:MaxPermsize are the memory exclusively occupied by JVM in Tomcat. The default size is the same as Xms and-Xmx.-XX:PermSize is physical.

The 1x64 prime of the physical memory is 1max 4 of the physical memory.

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