aspose file tools*
The moose likes Java in General and the fly likes Java OS VM Increase Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login


Win a copy of Spring in Action this week in the Spring forum!
JavaRanch » Java Forums » Java » Java in General
Bookmark "Java OS VM Increase" Watch "Java OS VM Increase" New topic
Author

Java OS VM Increase

Indika Maligaspe
Greenhorn

Joined: Sep 15, 2004
Posts: 3
Hi Everyone,
We are currently having an issue where the OS Virtual Memory allocated for java increases. Let me put our Environment.

Server � 4GB Physical RAM / 4 Xeon Processors.
OS � Windows 2003 server.
Application Server � tomcat 5.0.27 (A cluster of three nodes), with ISAPI Redirector 2 with IIS 6.0.
Java - jdk1.5.0
Java options used - -server -Xmx512m -XX:MaxNewSize=256m -Xminf.5 -Xmaxf.8 -XX:NewSize=2m -XX:NewRatio=3 -Xcompactgc -XX:+UseParallelGC -XX:+UseAdaptiveSizePolicy -XX arallelGCThreads=4 -XX:+CMSClassUnloadingEnabled -XX:MaxPermSize=256m -Xms256m -Xloggc:C:\logs\gc_log.log -XX:+PrintTLE

Now my problem is this, all three nodes start of without any problem and works for a while. Then the Virtual Memory (Private Bytes) on the OS and the Working Set increases as we work, then when the GC runs and the Working Set�s memory reduces, but the Virtual memory keeps on increases, after the VM reaches about 1GB the server hangs up.
What I would like to know is the following,
1.If have set the setting of maximum heap size as 512m, then why is the VM growing up to 1GB?
2.If the working set is reducing, then why is the VM keep on increasing?
3.Is there a setting to clear the VM on the OS?

Thanks in advance for any help you can provide.
 
I agree. Here's the link: http://aspose.com/file-tools
 
subject: Java OS VM Increase