1 /*
   2  * Copyright (c) 2019, 2020, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 package gc.z;
  25 
  26 /*
  27  * @test TestSmallHeap
  28  * @requires vm.gc.Z & !vm.graal.enabled
  29  * @summary Test ZGC with small heaps
  30  * @library / /test/lib
  31  * @run driver gc.z.TestSmallHeap 8M 16M 32M 64M 128M 256M 512M 1024M
  32  */
  33 
  34 import jdk.test.lib.process.ProcessTools;
  35 import static gc.testlibrary.Allocation.blackHole;
  36 
  37 public class TestSmallHeap {
  38     public static class Test {
  39         public static void main(String[] args) throws Exception {
  40             final long maxCapacity = Runtime.getRuntime().maxMemory();
  41             System.out.println("Max Capacity " + maxCapacity + " bytes");
  42 
  43             // Allocate byte arrays of increasing length, so that
  44             // all allocation paths (small/medium/large) are tested.
  45             for (int length = 16; length <= maxCapacity / 16; length *= 2) {
  46                 System.out.println("Allocating " + length + " bytes");
  47                 blackHole(new byte[length]);
  48             }
  49 
  50             System.out.println("Success");
  51         }
  52     }
  53 
  54     public static void main(String[] args) throws Exception {
  55         for (var maxCapacity: args) {
  56             ProcessTools.executeProcess(ProcessTools.createJavaProcessBuilder(
  57                                         "-XX:+UseZGC",
  58                                         "-Xlog:gc,gc+init,gc+reloc,gc+heap",
  59                                         "-Xmx" + maxCapacity,
  60                                         Test.class.getName()))
  61                 .outputTo(System.out)
  62                 .errorTo(System.out)
  63                 .shouldContain("Success")
  64                 .shouldHaveExitValue(0);
  65         }
  66     }
  67 }