1 /*
 2  * Copyright (c) 2015, 2023, Oracle and/or its affiliates. All rights reserved.
 3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 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
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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
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22  */
23 
24 package gc.ergonomics;
25 
26 /*
27  * @test TestDynamicNumberOfGCThreads
28  * @bug 8017462
29  * @summary Ensure that UseDynamicNumberOfGCThreads runs
30  * @modules java.base/jdk.internal.misc
31  * @library /test/lib
32  * @build jdk.test.whitebox.WhiteBox
33  * @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
34  * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI gc.ergonomics.TestDynamicNumberOfGCThreads
35  */
36 
37 import jdk.test.lib.process.OutputAnalyzer;
38 import jdk.test.lib.process.ProcessTools;
39 import jtreg.SkippedException;
40 import jdk.test.whitebox.gc.GC;
41 
42 public class TestDynamicNumberOfGCThreads {
43   public static void main(String[] args) throws Exception {
44     boolean noneGCSupported = true;
45 
46     if (GC.G1.isSupported()) {
47       noneGCSupported = false;
48       testDynamicNumberOfGCThreads("UseG1GC");
49     }
50 
51     if (GC.Parallel.isSupported()) {
52       noneGCSupported = false;
53       testDynamicNumberOfGCThreads("UseParallelGC");
54     }
55 
56     if (GC.Shenandoah.isSupported()) {
57       noneGCSupported = false;
58       testDynamicNumberOfGCThreads("UseShenandoahGC");
59     }
60 
61     if (noneGCSupported) {
62       throw new SkippedException("Skipping test because none of G1/Parallel/Shenandoah is supported.");
63     }
64   }
65 
66   private static void verifyDynamicNumberOfGCThreads(OutputAnalyzer output) {
67     output.shouldHaveExitValue(0); // test should run succesfully
68     output.shouldContain("new_active_workers");
69   }
70 
71   private static void testDynamicNumberOfGCThreads(String gcFlag) throws Exception {
72     // UseDynamicNumberOfGCThreads enabled
73     String[] baseArgs = {"-XX:+UnlockExperimentalVMOptions", "-XX:+" + gcFlag, "-Xmx10M", "-XX:+UseDynamicNumberOfGCThreads", "-Xlog:gc+task=trace", GCTest.class.getName()};
74 
75     // Base test with gc and +UseDynamicNumberOfGCThreads:
76     ProcessBuilder pb_enabled = ProcessTools.createLimitedTestJavaProcessBuilder(baseArgs);
77     verifyDynamicNumberOfGCThreads(new OutputAnalyzer(pb_enabled.start()));
78 
79     // Turn on parallel reference processing
80     String[] parRefProcArg = {"-XX:+ParallelRefProcEnabled", "-XX:-ShowMessageBoxOnError"};
81     String[] parRefArgs = new String[baseArgs.length + parRefProcArg.length];
82     System.arraycopy(parRefProcArg, 0, parRefArgs, 0,                parRefProcArg.length);
83     System.arraycopy(baseArgs,  0, parRefArgs, parRefProcArg.length, baseArgs.length);
84     pb_enabled = ProcessTools.createLimitedTestJavaProcessBuilder(parRefArgs);
85     verifyDynamicNumberOfGCThreads(new OutputAnalyzer(pb_enabled.start()));
86   }
87 
88   static class GCTest {
89     private static byte[] garbage;
90     public static void main(String [] args) {
91       System.out.println("Creating garbage");
92       // create 128MB of garbage. This should result in at least one GC
93       for (int i = 0; i < 1024; i++) {
94         garbage = new byte[128 * 1024];
95       }
96       System.out.println("Done");
97     }
98   }
99 }