alvinalexander.com | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Java example source code file (TestSummarizeRSetStatsThreads.java)

This example Java source code file (TestSummarizeRSetStatsThreads.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

concurrent, could, exception, matcher, outputanalyzer, processbuilder, regex, string, testsummarizersetstatsthreads, xx\:\+unlockdiagnosticvmoptions, xx\:\+useg1gc, xx\:g1concrefinementthreads, xx\:parallelgcthreads

The TestSummarizeRSetStatsThreads.java Java example source code

/*
 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

/*
 * @test TestSummarizeRSetStatsThreads
 * @bug 8025441
 * @summary Ensure that various values of worker threads/concurrent
 * refinement threads do not crash the VM.
 * @key gc
 * @library /testlibrary
 */

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import com.oracle.java.testlibrary.ProcessTools;
import com.oracle.java.testlibrary.OutputAnalyzer;

public class TestSummarizeRSetStatsThreads {

  private static void runTest(int refinementThreads, int workerThreads) throws Exception {
    ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-XX:+UseG1GC",
                                                              "-XX:+UnlockDiagnosticVMOptions",
                                                              "-XX:+G1SummarizeRSetStats",
                                                              "-XX:G1ConcRefinementThreads=" + refinementThreads,
                                                              "-XX:ParallelGCThreads=" + workerThreads,
                                                              "-version");

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

    // check output to contain the string "Concurrent RS threads times (s)" followed by
    // the correct number of values in the next line.

    // a zero in refinement thread numbers indicates that the value in ParallelGCThreads should be used.
    // Additionally use at least one thread.
    int expectedNumRefinementThreads = refinementThreads == 0 ? workerThreads : refinementThreads;
    expectedNumRefinementThreads = Math.max(1, expectedNumRefinementThreads);
    // create the pattern made up of n copies of a floating point number pattern
    String numberPattern = String.format("%0" + expectedNumRefinementThreads + "d", 0)
      .replace("0", "\\s+\\d+\\.\\d+");
    String pattern = "Concurrent RS threads times \\(s\\)$" + numberPattern + "$";
    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 {
    if (!TestSummarizeRSetStatsTools.testingG1GC()) {
      return;
    }
    // different valid combinations of number of refinement and gc worker threads
    runTest(0, 0);
    runTest(0, 5);
    runTest(5, 0);
    runTest(10, 10);
    runTest(1, 2);
    runTest(4, 3);
  }
}

Other Java examples (source code examples)

Here is a short list of links related to this Java TestSummarizeRSetStatsThreads.java source code file:

... this post is sponsored by my books ...

#1 New Release!

FP Best Seller

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.