1 /*
   2  * Copyright (c) 2017, 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 /*
  25  * @test LargeSharedSpace
  26  * @bug 8168790 8169870
  27  * @summary Test CDS dumping using specific space size without crashing.
  28  * The space size used in the test might not be suitable on windows.
  29  * @requires (os.family != "windows")
  30  * @library /test/lib
  31  * @modules java.base/jdk.internal.misc
  32  *          java.management
  33  * @run main LargeSharedSpace
  34  */
  35 
  36 import jdk.test.lib.cds.CDSTestUtils;
  37 import jdk.test.lib.process.OutputAnalyzer;
  38 import jdk.test.lib.Platform;
  39 
  40 public class LargeSharedSpace {
  41     public static void main(String[] args) throws Exception {
  42        ProcessBuilder pb;
  43        OutputAnalyzer output;
  44 
  45        // Test case 1: -XX:SharedMiscCodeSize=1066924031
  46        //
  47        // The archive should be dumped successfully. It might fail to reserve memory
  48        // for shared space under low memory condition. The dumping process should not crash.
  49        output = CDSTestUtils.createArchive("-XX:SharedMiscCodeSize=1066924031",
  50                                            "-XX:+UnlockDiagnosticVMOptions");
  51        try {
  52            output.shouldContain("Loading classes to share");
  53        } catch (RuntimeException e1) {
  54            output.shouldContain("Unable to allocate memory for shared space");
  55        }
  56 
  57        // Test case 2: -XX:SharedMiscCodeSize=1600386047
  58        //
  59        // On 64-bit platform, compressed class pointer is used. When the combined
  60        // shared space size and the compressed space size is larger than the 4G
  61        // compressed klass limit (0x100000000), error is reported.
  62        //
  63        // The dumping process should not crash.
  64        if (Platform.is64bit()) {
  65            CDSTestUtils.createArchive(
  66                "-XX:+UseCompressedClassPointers", "-XX:CompressedClassSpaceSize=3G",
  67                "-XX:SharedMiscCodeSize=1600386047")
  68                .shouldContain("larger than compressed klass limit");
  69         }
  70 
  71         // Test case 3: -XX:SharedMiscCodeSize=1600386047
  72         //
  73         // On 32-bit platform, compressed class pointer is not used. It may fail
  74         // to reserve memory under low memory condition.
  75         //
  76         // The dumping process should not crash.
  77         if (Platform.is32bit()) {
  78             output = CDSTestUtils.createArchive("-XX:SharedMiscCodeSize=1600386047");
  79             try {
  80                 output.shouldContain("Loading classes to share");
  81             } catch (RuntimeException e3) {
  82                 output.shouldContain("Unable to allocate memory for shared space");
  83             }
  84         }
  85     }
  86 }