Heap space out of memory

java memory physics heap-memory
randomafk picture randomafk · Jul 19, 2011 · Viewed 239.8k times · Source

My application currently consumes quite a lot of memory because it is running physics simulations. The issue is that consistently, at the 51st simulation, Java will throw an error usually because of a heap space out of memory (my program eventually runs thousands of simulations).

Is there anyway I can not just increase the heap space but modify my program so that the heap space is cleared after every run so that I can run an arbitrary number of simulations?

Edit: Thanks guys. Turns out the simulator software wasn't clearing the information after every run and I had those runs all stored in an ArrayList.

Answer

Michael Hernandez picture Michael Hernandez · Jul 19, 2011

There is no way to dynamically increase the heap programatically since the heap is allocated when the Java Virtual Machine is started.

However, you can use this command 

java -Xmx1024M YourClass

to set the memory to 1024

or, you can set a min max

java -Xms256m -Xmx1024m YourClassNameHere

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