1 /*
   2  * Copyright (c) 2016, 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.process.ProcessTools;
  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        pb = ProcessTools.createJavaProcessBuilder(
  50                 "-XX:SharedMiscCodeSize=1066924031", "-XX:+UnlockDiagnosticVMOptions",
  51                 "-XX:SharedArchiveFile=./LargeSharedSpace.jsa", "-Xshare:dump");
  52        output = new OutputAnalyzer(pb.start());
  53        try {
  54            output.shouldContain("Loading classes to share");
  55        } catch (RuntimeException e1) {
  56            output.shouldContain("Unable to allocate memory for shared space");
  57        }
  58 
  59        // Test case 2: -XX:SharedMiscCodeSize=1600386047
  60        //
  61        // On 64-bit platform, compressed class pointer is used. When the combined
  62        // shared space size and the compressed space size is larger than the 4G
  63        // compressed klass limit (0x100000000), error is reported.
  64        //
  65        // The dumping process should not crash.
  66        if (Platform.is64bit()) {
  67            pb = ProcessTools.createJavaProcessBuilder(
  68                     "-XX:+UseCompressedClassPointers", "-XX:CompressedClassSpaceSize=3G",
  69                     "-XX:SharedMiscCodeSize=1600386047", "-XX:+UnlockDiagnosticVMOptions",
  70                     "-XX:SharedArchiveFile=./LargeSharedSpace.jsa", "-Xshare:dump");
  71            output = new OutputAnalyzer(pb.start());
  72            output.shouldContain("larger than compressed klass limit");
  73         }
  74 
  75         // Test case 3: -XX:SharedMiscCodeSize=1600386047
  76         //
  77         // On 32-bit platform, compressed class pointer is not used. It may fail
  78         // to reserve memory under low memory condition. 
  79         //
  80         // The dumping process should not crash.
  81         if (Platform.is32bit()) {
  82            pb = ProcessTools.createJavaProcessBuilder(
  83                     "-XX:SharedMiscCodeSize=1600386047", "-XX:+UnlockDiagnosticVMOptions",
  84                     "-XX:SharedArchiveFile=./LargeSharedSpace.jsa", "-Xshare:dump");
  85            output = new OutputAnalyzer(pb.start());
  86            try {
  87                output.shouldContain("Loading classes to share");
  88            } catch (RuntimeException e3) {
  89                output.shouldContain("Unable to allocate memory for shared space");
  90            }
  91         }
  92     }
  93 }