Eclipse Release Heap Back to System

Eclipse release heap back to system

Found a solution. I switched Java to use the G1 garbage collector and now the HeapFreeRatio parameters works as intended. So I use these options in eclipse.ini:

-XX:+UnlockExperimentalVMOptions
-XX:+UseG1GC
-XX:MinHeapFreeRatio=5
-XX:MaxHeapFreeRatio=25

Now when Eclipse eats up more than 1 GB of RAM for a complicated operation and switched back to 300 MB after Garbage Collection the memory is actually released back to the operating system.

JVM Heap Allocation

Eclipse release heap back to system

Above link helps us to solve our problem.

We add
-XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:MinHeapFreeRatio=5 -XX:MaxHeapFreeRatio=25 -Xms256m -Xmx4096m
to Tomcat VM arguments.

How to view the current heap size that an application is using?

Use this code:

// Get current size of heap in bytes
long heapSize = Runtime.getRuntime().totalMemory(); 

// Get maximum size of heap in bytes. The heap cannot grow beyond this size.// Any attempt will result in an OutOfMemoryException.
long heapMaxSize = Runtime.getRuntime().maxMemory();

 // Get amount of free memory within the heap in bytes. This size will increase // after garbage collection and decrease as new objects are created.
long heapFreeSize = Runtime.getRuntime().freeMemory(); 

It was useful to me to know it.

Increasing heap space in Eclipse: (java.lang.OutOfMemoryError)

In Run->Run Configuration find the Name of the class you have been running, select it, click the Arguments tab then add:

-Xms512M -Xmx1524M

to the VM Arguments section

Eclipse: Garbage Collector Button

Yes, it is strictly a call to the JVM, not to an internal Eclipse function (see this thread).

Don't forget the Memory Analyzer to also check paths to garbage collection roots (in a Head Dump) if you suspect some memory leaking in your Eclipse session.

Note: that button is only available if you select the "Show Heap status" in the General section of the Eclipse preferences:

---

Related Topics