Linux Environment Java Memory Quick View

The recent production environment encountered memory is always very large situation, 16G of memory free memory only 100 m, as if a time bomb in general, perhaps service down. So I started looking for ways to see how memory is being used online. Now learn to sell, the following through an example to demonstrate, a total of 3 steps.

First, through the top command to see the process situation, press shift+m can be sorted by memory consumption size

Second, through the PS command to see which application

Third, through the Jmap command to show the heap usage, Jmap is the JDK's own memory viewing tool, specific use can refer to http://www.cnblogs.com/xingzc/p/5778014.html written very detailed

Linux Environment Java Memory Quick View