/*

 * Copyright (c) 2018, Google and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 */

package MyPackage;

/**

 * @test

 * @build Frame HeapMonitor

 * @summary Verifies the JVMTI Heap Monitor interval when allocating arrays.

 * @compile HeapMonitorArrayAllSampledTest.java

 * @run main/othervm/native -agentlib:HeapMonitorTest MyPackage.HeapMonitorArrayAllSampledTest

 */

public class HeapMonitorArrayAllSampledTest {

  // Do 1000 iterations and expect maxIteration samples.

  private static final int maxIteration = 1000;

  private static int array[];

  private static void allocate(int size) {

    for (int j = 0; j < maxIteration; j++) {

      array = new int[size];

    }

  }

  public static void main(String[] args) {

    int sizes[] = {1000, 10000, 100000, 1000000};

    HeapMonitor.setSamplingInterval(0);

    HeapMonitor.enableSamplingEvents();

    for (int currentSize : sizes) {

      System.out.println("Testing size " + currentSize);

      HeapMonitor.resetEventStorage();

      allocate(currentSize);

      // 10% error ensures a sanity test without becoming flaky.

      // Flakiness is due to the fact that this test is dependent on the sampling interval, which is a

      // statistical geometric variable around the sampling interval. This means that the test could be

      // unlucky and not achieve the mean average fast enough for the test case.

      if (!HeapMonitor.statsHaveExpectedNumberSamples(maxIteration, 10)) {

        throw new RuntimeException("Statistics should show about " + maxIteration + " samples.");

      }

    }

  }

}