Useful startup parameters for Java

#1, set the allocated JVM heap memory size

java-xms128m-xmx2g = "Initial 128M, Max 2G

#2, monitor heap memory overflow errors, and print heap snapshots

Java-xx:+heapdumponoutofmemoryerror-xx:heapdumppath=/tmp/heapdump.hprof = "Turns on heap memory overflow error logging and prints the snapshot to the specified directory

#3, set the allocated permanent memory size

A permanent generation is a separate area in heap memory that contains the object representation of all classes loaded by the JVM;

The permanent generation size set here is not included in the heap memory size set with # #.

java-xx:permsize=128m-xx:maxpermsize=256m = "Initial 128M, Max 256M

#4, set the allocated Cenozoic memory size

The Cenozoic is part of the memory allocated in # #

-xx:newsize and-xx:maxnewsize

Generally set to-XMX/2

Useful startup parameters for Java