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Tip of the Day
Language: Visual Basic
Expertise: Intermediate
Mar 6, 2000



Building the Right Environment to Support AI, Machine Learning and Deep Learning

Determine Your Heap Size

The following example program prints out both the total and free memory sizes, allocates a chunk of memory, and then prints the memory sizes again. If the initial size of your JVM's heap is about 1 MB, you should see the total memory increase as the heap grows. The amount of free memory should change as a function of the amount of memory allocated and the increase in size of the heap.
public final class HeapSize {

  public static final int DATA_SIZE = 1024*1024;

  public static final void printMemory(Runtime runtime) {
    System.out.println("\nTotal Memory: " + runtime.totalMemory());
    System.out.println("Free Memory : " + runtime.freeMemory());

  public static final void main(String[] args) {
    Runtime runtime;
    byte[] data;

    runtime = Runtime.getRuntime();


    data = new byte[DATA_SIZE];


Daniel Savarese
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