Tomcat configuration JVM parameters

The default configuration after Tomcat installation usually does not work stably, and it needs to be optimized. In this chapter, we will introduce how to configure JVM parameters in Tomcat.

Open Tomcat's JVM configuration file: %tomcat%/bin/catalina.sh(catalina.bat in Windows), and directly add parameters to the file.

For example, if we want to configure the JVM memory, we can add the following parameters before cygwin=false of the file:

JAVA_OPTS='-Xms512m -Xmx1024m'

Where XMS is the initialization memory and Xmx is the maximum memory available. If "m" is added, it means MB, otherwise it is KB. JVM memory can be configured according to the size of its own server.

Problem phenomenon:

If a gc overhead limit exceeded error occurs in the log during the use of FineBI.

Problem analysis:

You can add the parameter-XX:-UseGCOverheadLimit to Tomcat's jvm configuration, such as:

JAVA_OPTS='-Xms512m -Xmx1024m -XX:-UseGCOverheadLimit'

The error is that the GC time is consumed too much when the memory is insufficient. Adding parameters turns off the GC time detection feature. When the memory is insufficient, the jvm does not throw GC overhead limit exceeded, but throws Java heap space and generates a dump file to analyze the cause of the problem.