Netbeans默认选项，使用更多内存启动jvm

Question

I am getting OutOfMemoryException. I increased memory of jvm in netbeans by Project->Properties->Run->VM Options to -Xms1600M -Xmx1600M.

I am running 32-bit java, on windows 7 4GB RAM JDK version 1.7 Netbeans Version 7.0.1

But when i run,

System.out.println("MaxMemory: " + Runtime.getRuntime().maxMemory()/1024/1024);
System.out.println("FeeMemory: " + Runtime.getRuntime().freeMemory()/1024/1024);
System.out.println("TotalMemory: " + Runtime.getRuntime().totalMemory()/1024/1024);

I get

MaxMemory: 247 FeeMemory: 14 TotalMemory: 15

I tried to change netbeans_default_options by changinf netbeans.conf file.

netbeans_default_options="-J-client -J-Xss2m -J-Xms32m -J-XX:PermSize=32m -J-Dapple.laf.useScreenMenuBar=true -J-Dapple.awt.graphics.UseQuartz=true -J-Dsun.java2d.noddraw=true"

to

netbeans_default_options="-J-client -J-Xss2m -J-Xmx1800m -J-XX:+UseConcMarkSweepGC -J-XX:+CMSClassUnloadingEnabled -J-XX:+CMSPermGenSweepingEnabled -J-Xms32m -J-XX:PermSize=32m -J-Dapple.laf.useScreenMenuBar=true -J-Dapple.awt.graphics.UseQuartz=true -J-Dsun.java2d.noddraw=true"

But it gives me JVM creation failed error.

EDITED

As suggested change made:

netbeans_default_options="-J-client -J-Xss2m -J-Xmx1400m -J-Xms1400m -J-XX:+UseConcMarkSweepGC -J-XX:+CMSClassUnloadingEnabled -J-XX:+CMSPermGenSweepingEnabled -J-XX:PermSize=32m -J-Dapple.laf.useScreenMenuBar=true -J-Dapple.awt.graphics.UseQuartz=true -J-Dsun.java2d.noddraw=true"

Still getting JVM Creation failed error

Help.

Thanks in advance

Answer 1

i'm not so sure but as what i've known, if you are running on a 32 bit environment, you cannot assign more than 1GB of memory to the jvm.

for more information refer to this link http://www.oracle.com/technetwork/java/javase/gc-tuning-6-140523.html

Answer 2

I uninstalled everything(java and netbeans) and reinstalled everything(java and netbeans). It is still not able to assign -Xmx1400m but assigns -Xmx1000m and works well. Thank you everyone for your effort.