get maximum heap size that can be allocated

**gautam.aditya97** · 03-29-2010, 01:40 PM

Hi

is there a way by which i can progmatically find the current maximum amount of system heap memory that can be allocated by a JVM.

Or if i am writing a simple java code and want to know what's the current SYSTEM max heap memory,

Thanks

**r035198x** · 03-29-2010, 02:13 PM

What do you mean by system heap memory?
The heap is used by your java application not by your OS.

**gautam.aditya97** · 03-30-2010, 08:27 AM

what i meant was... for eg.

if i run

java -Xms64m -Xmx512m -jar xyz.jar (it runs)

else

java -Xms64m -Xmx2000m -jar xyz.jar (it fails, sayin "Failed to instantiate heap. 2000M requested. Could not create the Java virtual machine.)

is there a way by which i can progmatically know the maximum heap that can be allocated.

**amp88** · 04-05-2010, 05:03 AM

The Runtime class provides some information on this. See here for a bit more information on Runtime and other ways to assess memory usage more accurately.