What are the three ways to view JVM memory?

This article is to share with you what are the three ways to view JVM memory. The editor thinks it is very practical, so I share it with you to learn. I hope you can get something after reading this article.

Usually you can view it in code, or you can view it directly after adding relevant information to eclipse.

JVM memory viewing method

You can view it in code, or you can view it directly after adding relevant information to eclipse.

1. Use the following code to view JVM memory

Memory.java importjava.lang.Runtime; publicclassmemory {publicstaticvoidmain (Stringargs []) {System.out.println ("usage:"); memorym=newmemory (); longt=m.showUsage (); System.out.println ("Total:" + t + "Bytes"); longfr=m.freeMemory (); / / System.gc (); System.out.println ("Free:" + fr+ "Bytes"); longrem=t-fr; System.out.println ("OccupiedSpace:" + rem+ "Bytes") } publiclongshowUsage () {longl=Runtime.getRuntime () .totalMemory (); return (l);} publiclongfreeMemory () {longf=Runtime.getRuntime () .freeMemory (); return (f);}}

two。 JVM memory View in Eclipse

a. Create a file under the root directory of eclipse. The file name is options. Save it without suffix. The file content is org.eclipse.ui/perf/showHeapStatus=true.

b. Modify the eclipse.ini file in the eclipse directory and add the following at the beginning of the file:

-debug options-vm javaw.exe

Restart eclipse and you can see the message that JVM is added to the status bar below.

3. The method of changing the memory size of JVM

Java-Xms100m-Xmx250memory

These are the three ways to view JVM memory, and the editor believes that there are some knowledge points that we may see or use in our daily work. I hope you can learn more from this article. For more details, please follow the industry information channel.