Java 1.6 32位最小和最大堆内存问题

Question

I have the JRE v1.6 that is 32-bit installed. When I attempt to run a program as follows:

java -Xms1024m -Xmx2048m net.analysis.MyProg

I see the following message displayed:

Error occurred during initialization of VM
Could not reserve enough space for object heap
Could not create the Java virtual machine

As far as I know, the maximum heap allowed for a 32-bit JVM is 2 GB. On the computer running my code there is 131061 MB of physical memory (using Window's Task Manager, 128 GB of RAM).

Does anyone know what am I doing wrong here?

Answer 1

In your case, the limit is most likely the 32 bit architecture and the way that Windows is apportioning the virtual address space.

According to the Oracle JVM FAQ , you can only expect to get 1.4Gb to 1.6Gb on a 32bit JVM on Windows.