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