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annotate test/gc/arguments/TestG1ConcRefinementThreads.java @ 20543:e7d0505c8a30

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8059758: Footprint regressions with JDK-8038423 Summary: Changes in JDK-8038423 always initialize (zero out) virtual memory used for auxiliary data structures. This causes a footprint regression for G1 in startup benchmarks. This is because they do not touch that memory at all, so the operating system does not actually commit these pages. The fix is to, if the initialization value of the data structures matches the default value of just committed memory (=0), do not do anything. Reviewed-by: jwilhelm, brutisso
author tschatzl
date Fri, 10 Oct 2014 15:51:58 +0200
parents 8ba0078861d4
children
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20505
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1 /*
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2 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23
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24 /*
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25 * @test TestG1ConcRefinementThreads
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26 * @key gc
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27 * @bug 8047976
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28 * @summary Tests argument processing for G1ConcRefinementThreads
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29 * @library /testlibrary
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30 */
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31
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32 import com.oracle.java.testlibrary.*;
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33 import java.util.*;
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34 import java.util.regex.*;
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35
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36 public class TestG1ConcRefinementThreads {
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37
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38 static final int AUTO_SELECT_THREADS_COUNT = 0;
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39 static final int PASSED_THREADS_COUNT = 11;
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40
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41 public static void main(String args[]) throws Exception {
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42 // default case
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43 runG1ConcRefinementThreadsTest(
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44 new String[]{}, // automatically selected
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45 AUTO_SELECT_THREADS_COUNT /* use default setting */);
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46
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47 // zero setting case
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48 runG1ConcRefinementThreadsTest(
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49 new String[]{"-XX:G1ConcRefinementThreads=0"}, // automatically selected
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50 AUTO_SELECT_THREADS_COUNT /* set to zero */);
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51
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52 // non-zero sestting case
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53 runG1ConcRefinementThreadsTest(
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54 new String[]{"-XX:G1ConcRefinementThreads="+Integer.toString(PASSED_THREADS_COUNT)},
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55 PASSED_THREADS_COUNT);
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56 }
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57
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58 private static void runG1ConcRefinementThreadsTest(String[] passedOpts,
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59 int expectedValue) throws Exception {
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60 List<String> vmOpts = new ArrayList<>();
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61 if (passedOpts.length > 0) {
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62 Collections.addAll(vmOpts, passedOpts);
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63 }
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64 Collections.addAll(vmOpts, "-XX:+UseG1GC", "-XX:+PrintFlagsFinal", "-version");
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65
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66 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(vmOpts.toArray(new String[vmOpts.size()]));
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67 OutputAnalyzer output = new OutputAnalyzer(pb.start());
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68
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69 output.shouldHaveExitValue(0);
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70 String stdout = output.getStdout();
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71 checkG1ConcRefinementThreadsConsistency(stdout, expectedValue);
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72 }
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73
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74 private static void checkG1ConcRefinementThreadsConsistency(String output, int expectedValue) {
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75 int actualValue = getIntValue("G1ConcRefinementThreads", output);
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76
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77 if (expectedValue == 0) {
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78 // If expectedValue is automatically selected, set it same as ParallelGCThreads.
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79 expectedValue = getIntValue("ParallelGCThreads", output);
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80 }
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81
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82 if (expectedValue != actualValue) {
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83 throw new RuntimeException(
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84 "Actual G1ConcRefinementThreads(" + Integer.toString(actualValue)
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85 + ") is not equal to expected value(" + Integer.toString(expectedValue) + ")");
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86 }
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87 }
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88
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89 public static int getIntValue(String flag, String where) {
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90 Matcher m = Pattern.compile(flag + "\\s+:?=\\s+\\d+").matcher(where);
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91 if (!m.find()) {
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92 throw new RuntimeException("Could not find value for flag " + flag + " in output string");
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93 }
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94 String match = m.group();
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95 return Integer.parseInt(match.substring(match.lastIndexOf(" ") + 1, match.length()));
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96 }
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97 }