static void forceMem(int n) {
    // force enough memory
    Long[] junk = new Long[n];
    for (int i = 0; i < junk.length; ++i) {
      junk[i] = (long) i;
    }
    int sum = 0;
    for (int i = 0; i < junk.length; ++i) {
      sum += (int) (junk[i] + i);
    }
    if (sum == 0) {
      System.out.println("Useless number = " + sum);
    }
    junk = null;
    // System.gc();
  }
@test
@synopsis Times and checks basic map operations
geode-core/src/integrationTest/java/org/apache/geode/internal/util/concurrent/cm/MapCheckJUnitTest.java