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/*

 * @test TestRemsetLoggingThreads

 * @requires vm.gc.G1

 * @bug 8025441 8145534

 * @key gc

 * @library /testlibrary

 * @modules java.base/jdk.internal.misc

 *          java.management/sun.management

 * @summary Ensure that various values of worker threads/concurrent

 * refinement threads do not crash the VM.

 */

import java.util.regex.Matcher;

import java.util.regex.Pattern;

import jdk.test.lib.ProcessTools;

import jdk.test.lib.OutputAnalyzer;

public class TestRemsetLoggingThreads {

  private static void runTest(int refinementThreads, int workerThreads) throws Exception {

    ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-XX:+UseG1GC",

                                                              "-XX:+UnlockDiagnosticVMOptions",

                                                              "-Xlog:gc+remset+exit=trace",

                                                              "-XX:G1ConcRefinementThreads=" + refinementThreads,

                                                              "-XX:ParallelGCThreads=" + workerThreads,

                                                              "-version");

    OutputAnalyzer output = new OutputAnalyzer(pb.start());

    // a zero in refinement thread numbers indicates that the value in ParallelGCThreads should be used.

    // Additionally use at least one thread.

    int expectedNumRefinementThreads = refinementThreads;

    String pattern = "Concurrent RS threads times \\(s\\)$";

    Matcher m = Pattern.compile(pattern, Pattern.MULTILINE).matcher(output.getStdout());

    if (!m.find()) {

      throw new Exception("Could not find correct output for concurrent RS threads times in stdout," +

        " should match the pattern \"" + pattern + "\", but stdout is \n" + output.getStdout());

    }

    output.shouldHaveExitValue(0);

  }

  public static void main(String[] args) throws Exception {

    // different valid combinations of number of refinement and gc worker threads

    runTest(1, 1);

    runTest(1, 5);

    runTest(5, 1);

    runTest(10, 10);

    runTest(1, 2);

    runTest(4, 3);

  }

}