public class test {
  private static int size = 0;
  private static int[] source = null, target = null;
  private static Runtime rt = Runtime.getRuntime();

  private static int[] alloc(int[] buffer, int size) {
    long start = System.nanoTime();
    buffer = new int[size];
    System.out.print(" Alloc " + (4L * buffer.length + 512*1024)/1024/1024 + " Mb in ");
    System.out.println((System.nanoTime() - start + 512*1024)/1024/1024 + " ms");
    return buffer;
  }

  private static void copy(int[] source, int[] target) {
    long start = System.nanoTime();
    System.arraycopy(source,0, target,0, source.length);
    System.out.print("  Copy " + (4L * source.length + 512*1024)/1024/1024 + " Mb in ");
    System.out.println((System.nanoTime() - start + 512*1024)/1024/1024 + " ms");
  }

  private static void stat() {
    System.out.print("Memory: " + (rt.totalMemory() + 512*1024)/1024/1024 + " Mb total / ");
    System.out.println((rt.freeMemory() + 512/1024)/1024/1024 + " Mb free");
  }

  public static void main(String[] args) {
    try { size = Integer.parseInt(args[0]); }
    catch (RuntimeException e) {}
    finally {}
    if (size < 1) size = 512;
    if (size > 1024) size = 512;
    size *= 1024*1024;

    stat();
    source = alloc(source,size);
    target = alloc(target,size+1024*1024);
    copy(source,target);
    stat();
    System.out.println("");
  }
}