Jdk1.6 VM tuning practices (1) and jdk1.6vm tuning practices

Jdk1.6 VM tuning practices (1) and jdk1.6vm tuning practices

Linux 2 CPU 16 GB memory, tomcat7

JAVA_OPTS = "-Xmx1024m-Xms1024m-Xss1024K-XX: PermSize = 512 m-XX: MaxPermSize = 1024 m"
Cygwin = false

Heap memory:

Xmx, xms is up to 1/4 of the physical memory size, which saves xms and xmx allocation.

Xss, single thread

Permsize: permanent partition size,

Maxpermsize: up to 1/4 of the physical memory size

 

View the proportion of vm garbage collection in each region and the recovery time and times

Jstat-gcutil LOVMID 500 20

The proportion of old and perm is significantly reduced.