1 /*
   2 * Copyright (c) 2014, 2015, 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 TestG1ConcRefinementThreads
  26  * @key gc
  27  * @bug 8047976
  28  * @summary Tests argument processing for G1ConcRefinementThreads
  29  * @library /testlibrary
  30  * @modules java.base/sun.misc
  31  *          java.management
  32  */
  33 
  34 import com.oracle.java.testlibrary.*;
  35 import java.util.*;
  36 import java.util.regex.*;
  37 
  38 public class TestG1ConcRefinementThreads {
  39 
  40   static final int AUTO_SELECT_THREADS_COUNT = 0;
  41   static final int PASSED_THREADS_COUNT = 11;
  42 
  43   public static void main(String args[]) throws Exception {
  44     // default case
  45     runG1ConcRefinementThreadsTest(
  46         new String[]{}, // automatically selected
  47         AUTO_SELECT_THREADS_COUNT /* use default setting */);
  48 
  49     // zero setting case
  50     runG1ConcRefinementThreadsTest(
  51         new String[]{"-XX:G1ConcRefinementThreads=0"}, // automatically selected
  52         AUTO_SELECT_THREADS_COUNT /* set to zero */);
  53 
  54     // non-zero sestting case
  55     runG1ConcRefinementThreadsTest(
  56         new String[]{"-XX:G1ConcRefinementThreads="+Integer.toString(PASSED_THREADS_COUNT)},
  57         PASSED_THREADS_COUNT);
  58   }
  59 
  60   private static void runG1ConcRefinementThreadsTest(String[] passedOpts,
  61           int expectedValue) throws Exception {
  62     List<String> vmOpts = new ArrayList<>();
  63     if (passedOpts.length > 0) {
  64       Collections.addAll(vmOpts, passedOpts);
  65     }
  66     Collections.addAll(vmOpts, "-XX:+UseG1GC", "-XX:+PrintFlagsFinal", "-version");
  67 
  68     ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(vmOpts.toArray(new String[vmOpts.size()]));
  69     OutputAnalyzer output = new OutputAnalyzer(pb.start());
  70 
  71     output.shouldHaveExitValue(0);
  72     String stdout = output.getStdout();
  73     checkG1ConcRefinementThreadsConsistency(stdout, expectedValue);
  74   }
  75 
  76   private static void checkG1ConcRefinementThreadsConsistency(String output, int expectedValue) {
  77     int actualValue = getIntValue("G1ConcRefinementThreads", output);
  78 
  79     if (expectedValue == 0) {
  80       // If expectedValue is automatically selected, set it same as ParallelGCThreads.
  81       expectedValue = getIntValue("ParallelGCThreads", output);
  82     }
  83 
  84     if (expectedValue != actualValue) {
  85       throw new RuntimeException(
  86             "Actual G1ConcRefinementThreads(" + Integer.toString(actualValue)
  87             + ") is not equal to expected value(" + Integer.toString(expectedValue) + ")");
  88     }
  89   }
  90 
  91   public static int getIntValue(String flag, String where) {
  92     Matcher m = Pattern.compile(flag + "\\s+:?=\\s+\\d+").matcher(where);
  93     if (!m.find()) {
  94       throw new RuntimeException("Could not find value for flag " + flag + " in output string");
  95     }
  96     String match = m.group();
  97     return Integer.parseInt(match.substring(match.lastIndexOf(" ") + 1, match.length()));
  98   }
  99 }