Can a Java program detect that it's running low on heap space?

Question

I will be running a genetic algorithm on my roommate\'s computer for the whole weekend, and I\'m afraid that it could run out of memory over such a long run. However, my alg

Answer 1

You can register a javax.management.NotificationListener that is called when a certain threshold is hit.

Something like

final MemoryMXBean memBean = ManagementFactory.getMemoryMXBean();
final NotificationEmitter ne = (NotificationEmitter) memBean;

ne.addNotificationListener(listener, null, null);

final List<MemoryPoolMXBean> memPools = ManagementFactory
    .getMemoryPoolMXBeans();
for (final MemoryPoolMXBean mp : memPools) {
  if (mp.isUsageThresholdSupported()) {
    final MemoryUsage mu = mp.getUsage();
    final long max = mu.getMax();
    final long alert = (max * threshold) / 100;
    mp.setUsageThreshold(alert);

  }
}

Where listener is your own implementation of NotificationListener.

Answer 2

Just use WeakReferences for the discardable results, then they will be discarded if necessary for space reasons.

Answer 3

You can try this:

// 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();

As found here - http://www.exampledepot.com/egs/java.lang/GetHeapSize.html

Answer 4

I am not sure about this, but can't JConsole solve your purpose ??