TestParallelGCThreads.java revision 8359:ed6389f70257 
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23
24/*
25 * @test TestParallelGCThreads
26 * @key gc
27 * @bug 8059527
28 * @summary Tests argument processing for ParallelGCThreads
29 * @library /testlibrary
30 * @modules java.base/sun.misc
31 *          java.management
32 * @run driver TestParallelGCThreads
33 */
34
35import jdk.test.lib.*;
36
37public class TestParallelGCThreads {
38
39  public static void main(String args[]) throws Exception {
40
41    // For each parallel collector (G1, Parallel, ParNew/CMS)
42    for (String gc : new String[] {"G1", "Parallel", "ConcMarkSweep"}) {
43
44      // Make sure the VM does not allow ParallelGCThreads set to 0
45      String[] flags = new String[] {"-XX:+Use" + gc + "GC", "-XX:ParallelGCThreads=0", "-XX:+PrintFlagsFinal", "-version"};
46      ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(flags);
47      OutputAnalyzer output = new OutputAnalyzer(pb.start());
48      output.shouldHaveExitValue(1);
49
50      // Do some basic testing to ensure the flag updates the count
51      for (long i = 1; i <= 3; i++) {
52        flags = new String[] {"-XX:+Use" + gc + "GC", "-XX:ParallelGCThreads=" + i, "-XX:+PrintFlagsFinal", "-version"};
53        long count = getParallelGCThreadCount(flags);
54        Asserts.assertEQ(count, i, "Specifying ParallelGCThreads=" + i + " for " + gc + "GC does not set the thread count properly!");
55      }
56    }
57  }
58
59  public static long getParallelGCThreadCount(String flags[]) throws Exception {
60    ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(flags);
61    OutputAnalyzer output = new OutputAnalyzer(pb.start());
62    output.shouldHaveExitValue(0);
63    String stdout = output.getStdout();
64    return FlagsValue.getFlagLongValue("ParallelGCThreads", stdout);
65  }
66}
67