1 /*
   2 * Copyright (c) 2014, 2016, 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
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  22 */
  23 
  24 /*
  25  * @test TestG1ConcRefinementThreads
  26  * @key gc
  27  * @bug 8047976
  28  * @requires vm.gc.G1
  29  * @summary Tests argument processing for G1ConcRefinementThreads
  30  * @library /test/lib
  31  * @modules java.base/jdk.internal.misc
  32  *          java.management
  33  */
  34 
  35 import jdk.test.lib.process.OutputAnalyzer;
  36 import jdk.test.lib.process.ProcessTools;
  37 import java.util.*;
  38 import java.util.regex.*;
  39 
  40 public class TestG1ConcRefinementThreads {
  41 
  42   static final int AUTO_SELECT_THREADS_COUNT = -1;
  43   static final int PASSED_THREADS_COUNT = 11;
  44 
  45   public static void main(String args[]) throws Exception {
  46     // default case
  47     runG1ConcRefinementThreadsTest(
  48         new String[]{}, // automatically selected
  49         AUTO_SELECT_THREADS_COUNT /* use default setting */);
  50 
  51     // zero setting case
  52     runG1ConcRefinementThreadsTest(
  53         new String[]{"-XX:G1ConcRefinementThreads=0"},
  54         0);
  55 
  56     // non-zero sestting case
  57     runG1ConcRefinementThreadsTest(
  58         new String[]{"-XX:G1ConcRefinementThreads="+Integer.toString(PASSED_THREADS_COUNT)},
  59         PASSED_THREADS_COUNT);
  60   }
  61 
  62   private static void runG1ConcRefinementThreadsTest(String[] passedOpts,
  63           int expectedValue) throws Exception {
  64     List<String> vmOpts = new ArrayList<>();
  65     if (passedOpts.length > 0) {
  66       Collections.addAll(vmOpts, passedOpts);
  67     }
  68     Collections.addAll(vmOpts, "-XX:+UseG1GC", "-XX:+PrintFlagsFinal", "-version");
  69 
  70     ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(vmOpts.toArray(new String[vmOpts.size()]));
  71     OutputAnalyzer output = new OutputAnalyzer(pb.start());
  72 
  73     output.shouldHaveExitValue(0);
  74     String stdout = output.getStdout();
  75     checkG1ConcRefinementThreadsConsistency(stdout, expectedValue);
  76   }
  77 
  78   private static void checkG1ConcRefinementThreadsConsistency(String output, int expectedValue) {
  79     int actualValue = getIntValue("G1ConcRefinementThreads", output);
  80 
  81     if (expectedValue == AUTO_SELECT_THREADS_COUNT) {
  82       // If expectedValue is automatically selected, set it same as ParallelGCThreads.
  83       expectedValue = getIntValue("ParallelGCThreads", output);
  84     }
  85 
  86     if (expectedValue != actualValue) {
  87       throw new RuntimeException(
  88             "Actual G1ConcRefinementThreads(" + Integer.toString(actualValue)
  89             + ") is not equal to expected value(" + Integer.toString(expectedValue) + ")");
  90     }
  91   }
  92 
  93   public static int getIntValue(String flag, String where) {
  94     Matcher m = Pattern.compile(flag + "\\s+:?=\\s+\\d+").matcher(where);
  95     if (!m.find()) {
  96       throw new RuntimeException("Could not find value for flag " + flag + " in output string");
  97     }
  98     String match = m.group();
  99     return Integer.parseInt(match.substring(match.lastIndexOf(" ") + 1, match.length()));
 100   }
 101 }