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annotate test/stress/gc/TestStressRSetCoarsening.java @ 24225:a2dbb6fcc923

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Added tag jvmci-0.33 for changeset 3aed4cb813f4
author Doug Simon <doug.simon@oracle.com>
date Fri, 18 Aug 2017 22:47:33 +0200
parents 89c75331f9b6
children
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1 /*
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2 * Copyright (c) 2016, 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 import java.util.concurrent.TimeoutException;
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25 import sun.hotspot.WhiteBox;
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26
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27 /*
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28 * @test TestStressRSetCoarsening.java
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29 * @key stress
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30 * @bug 8146984 8147087
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31 * @requires vm.gc=="G1" | vm.gc=="null"
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32 * @requires os.maxMemory > 3G
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33 *
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34 * @summary Stress G1 Remembered Set by creating a lot of cross region links
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35 * @library /testlibrary /testlibrary/whitebox
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36 * @build sun.hotspot.WhiteBox
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37 * @run main ClassFileInstaller sun.hotspot.WhiteBox
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38 * sun.hotspot.WhiteBox$WhiteBoxPermission
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39 * @run main/othervm/timeout=300
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40 * -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:+UseG1GC
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41 * -XX:+IgnoreUnrecognizedVMOptions -XX:+PrintGC -XX:+PrintGCTimeStamps -Xlog:gc
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42 * -Xmx500m -XX:G1HeapRegionSize=1m -XX:MaxGCPauseMillis=1000 TestStressRSetCoarsening 1 0 300
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43 * @run main/othervm/timeout=300
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44 * -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:+UseG1GC
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45 * -XX:+IgnoreUnrecognizedVMOptions -XX:+PrintGC -XX:+PrintGCTimeStamps -Xlog:gc
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46 * -Xmx500m -XX:G1HeapRegionSize=8m -XX:MaxGCPauseMillis=1000 TestStressRSetCoarsening 1 10 300
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47 * @run main/othervm/timeout=300
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48 * -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:+UseG1GC
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49 * -XX:+IgnoreUnrecognizedVMOptions -XX:+PrintGC -XX:+PrintGCTimeStamps -Xlog:gc
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50 * -Xmx500m -XX:G1HeapRegionSize=32m -XX:MaxGCPauseMillis=1000 TestStressRSetCoarsening 42 10 300
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51 * @run main/othervm/timeout=300
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52 * -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:+UseG1GC
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53 * -XX:+IgnoreUnrecognizedVMOptions -XX:+PrintGC -XX:+PrintGCTimeStamps -Xlog:gc
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54 * -Xmx500m -XX:G1HeapRegionSize=1m -XX:MaxGCPauseMillis=1000 TestStressRSetCoarsening 2 0 300
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55 * @run main/othervm/timeout=1800
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56 * -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:+UseG1GC
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57 * -XX:+IgnoreUnrecognizedVMOptions -XX:+PrintGC -XX:+PrintGCTimeStamps -Xlog:gc
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58 * -Xmx1G -XX:G1HeapRegionSize=1m -XX:MaxGCPauseMillis=1000 TestStressRSetCoarsening 500 0 1800
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59 * @run main/othervm/timeout=1800
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60 * -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:+UseG1GC
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61 * -XX:+IgnoreUnrecognizedVMOptions -XX:+PrintGC -XX:+PrintGCTimeStamps -Xlog:gc
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62 * -Xmx1G -XX:G1HeapRegionSize=1m -XX:MaxGCPauseMillis=1000 TestStressRSetCoarsening 10 10 1800
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63 */
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64
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65 /**
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66 * What the test does.
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67 * Preparation stage:
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68 * Fill out ~90% of the heap with objects, each object is an object array.
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69 * If we want to allocate K objects per region, we calculate N to meet:
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70 * sizeOf(Object[N]) ~= regionSize / K
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71 * Stress stage:
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72 * No more allocation, so no more GC.
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73 * We will perform a number of iterations. On each iteration i,
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74 * for each pair of regions Rx and Ry we will set c[i] references
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75 * from Rx to Ry. If c[i] less than c[i-1] at the end of iteration
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76 * concurrent mark cycle will be initiated (to recalculate remembered sets).
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77 * As the result RSet will be growing up and down, up and down many times.
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78 *
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79 * The test expects: no crash and no timeouts.
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80 *
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81 * Test Parameters:
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82 * args[0] - number of objects per Heap Region (1 - means humongous)
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83 * args[1] - number of regions to refresh to provoke GC at the end of cycle.
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84 * (0 - means no GC, i.e. no reading from RSet)
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85 * args[2] - timeout in seconds (to stop execution to avoid jtreg timeout)
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86 */
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87 public class TestStressRSetCoarsening {
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88
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89 public static void main(String... args) throws InterruptedException {
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90 if (args.length != 3) {
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91 throw new IllegalArgumentException("Wrong number of arguments " + args.length);
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92 }
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93 int objectsPerRegion = Integer.parseInt(args[0]); // 1 means humongous
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94 int regsToRefresh = Integer.parseInt(args[1]); // 0 means no regions to refresh at the end of cycle
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95 int timeout = Integer.parseInt(args[2]); // in seconds, test should stop working eariler
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96 new TestStressRSetCoarsening(objectsPerRegion, regsToRefresh, timeout).go();
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97 }
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98
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99 private static final long KB = 1024;
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100 private static final long MB = 1024 * KB;
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101
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102 private static final WhiteBox WB = WhiteBox.getWhiteBox();
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103
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104 public final Object[][] storage;
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105
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106 /**
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107 * Number of objects per region. This is a test parameter.
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108 */
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109 public final int K;
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110
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111 /**
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112 * Length of object array: sizeOf(Object[N]) ~= regionSize / K
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113 * N will be calculated as function of K.
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114 */
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115 public final int N;
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116
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117 /**
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118 * How many regions involved into testing.
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119 * Will be calculated as heapFractionToAllocate * freeRegionCount.
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120 */
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121 public final int regionCount;
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122
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123 /**
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124 * How much heap to use.
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125 */
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126 public final float heapFractionToAllocate = 0.9f;
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127
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128 /**
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129 * How many regions to be refreshed at the end of cycle.
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130 * This is a test parameter.
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131 */
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132 public final int regsToRefresh;
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133
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134 /**
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135 * Initial time.
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136 */
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137 public final long start;
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138
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139 /**
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140 * Time when the test should stop working.
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141 */
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142 public final long finishAt;
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143
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144 /**
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145 * Does pre-calculation and allocate necessary objects.
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146 *
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147 * @param objPerRegions how many objects per G1 heap region
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148 */
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149 TestStressRSetCoarsening(int objPerRegions, int regsToRefresh, int timeout) {
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150 this.K = objPerRegions;
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151 this.regsToRefresh = regsToRefresh;
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152 this.start = System.currentTimeMillis();
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153 this.finishAt = start + timeout * 900; // 10% ahead of jtreg timeout
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154
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155 long regionSize = WB.g1RegionSize();
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156
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157 // How many free regions
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158 Runtime rt = Runtime.getRuntime();
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159 long used = rt.totalMemory() - rt.freeMemory();
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160 long totalFree = rt.maxMemory() - used;
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161 regionCount = (int) ((totalFree / regionSize) * heapFractionToAllocate);
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162 long toAllocate = regionCount * regionSize;
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163 System.out.println("%% Test parameters");
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164 System.out.println("%% Objects per region : " + K);
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165 System.out.println("%% Heap fraction to allocate : " + (int) (heapFractionToAllocate * 100) + "%");
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166 System.out.println("%% Regions to refresh to provoke GC: " + regsToRefresh);
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167
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168 System.out.println("%% Memory");
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169 System.out.println("%% used : " + used / MB + "M");
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170 System.out.println("%% available : " + totalFree / MB + "M");
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171 System.out.println("%% to allocate : " + toAllocate / MB + "M");
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172 System.out.println("%% (in regs) : " + regionCount);
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173 System.out.println("%% G1 Region Size: " + regionSize / MB + "M");
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174
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175 int refSize = WB.getHeapOopSize();
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176
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177 // Calculate N: K*sizeOf(Object[N]) ~= regionSize
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178 // sizeOf(Object[N]) ~= (N+4)*refSize
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179 // ==>
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180 // N = regionSize / K / refSize - 4;
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181 N = (int) ((regionSize / K) / refSize) - 5;
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182
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183 /*
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184 * --------------
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185 * region0 storage[0] = new Object[N]
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186 * ...
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187 * storage[K-1] = new Object[N]
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188 * ---------------
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189 * region1 storage[K] = new Object[N]
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190 * ...
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191 * storage[2*K - 1] = new Object[N]
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192 * --------------
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193 * ...
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194 * --------------
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195 * regionX storage[X*K] = new Object[N]
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196 * ...
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197 * storage[(X+1)*K -1] = new Object[N]
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198 * where X = HeapFraction * TotalRegions
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199 * -------------
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200 */
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201 System.out.println("%% Objects");
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202 System.out.println("%% N (array length) : " + N);
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203 System.out.println("%% K (objects in regions): " + K);
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204 System.out.println("%% Reference size : " + refSize);
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205 System.out.println("%% Approximate obj size : " + (N + 2) * refSize / KB + "K)");
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206
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207 storage = new Object[regionCount * K][];
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208 for (int i = 0; i < storage.length; i++) {
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209 storage[i] = new Object[N];
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210 }
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211 }
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212
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213 public void go() throws InterruptedException {
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214 // threshold for sparce -> fine
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215 final int FINE = WB.getIntxVMFlag("G1RSetSparseRegionEntries").intValue();
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216
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217 // threshold for fine -> coarse
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218 final int COARSE = WB.getIntxVMFlag("G1RSetRegionEntries").intValue();
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219
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220 // regToRegRefCounts - array of reference counts from region to region
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221 // at the the end of iteration.
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222 // The number of test iterations is array length - 1.
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223 // If c[i] > c[i-1] then during the iteration i more references will
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224 // be created.
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225 // If c[i] < c[i-1] then some referenes will be cleaned.
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226 int[] regToRegRefCounts = {0, FINE / 2, 0, FINE, (FINE + COARSE) / 2, 0,
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227 COARSE, COARSE + 10, FINE + 1, FINE / 2, 0};
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228
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229 // For progress tracking
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230 int[] progress = new int[regToRegRefCounts.length];
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231 progress[0] = 0;
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232 for (int i = 1; i < regToRegRefCounts.length; i++) {
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233 progress[i] = progress[i - 1] + Math.abs(regToRegRefCounts[i] - regToRegRefCounts[i - 1]);
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234 }
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235 try {
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236 for (int i = 1; i < regToRegRefCounts.length; i++) {
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237 int pre = regToRegRefCounts[i - 1];
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238 int cur = regToRegRefCounts[i];
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239 float prog = ((float) progress[i - 1] / progress[progress.length - 1]);
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240
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241 System.out.println("%% step " + i
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242 + " out of " + (regToRegRefCounts.length - 1)
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243 + " (~" + (int) (100 * prog) + "% done)");
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244 System.out.println("%% " + pre + " --> " + cur);
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245 for (int to = 0; to < regionCount; to++) {
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246 // Select a celebrity object that we will install references to.
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247 // The celebrity will be referred from all other regions.
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248 // If the number of references after should be less than they
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249 // were before, select NULL.
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250 Object celebrity = cur > pre ? storage[to * K] : null;
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251 for (int from = 0; from < regionCount; from++) {
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252 if (to == from) {
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253 continue; // no need to refer to itself
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254 }
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255
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256 int step = cur > pre ? +1 : -1;
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257 for (int rn = pre; rn != cur; rn += step) {
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258 storage[getY(to, from, rn)][getX(to, from, rn)] = celebrity;
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259 if (System.currentTimeMillis() > finishAt) {
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260 throw new TimeoutException();
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261 }
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262 }
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263 }
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264 }
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265 if (pre > cur) {
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266 // Number of references went down.
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267 // Need to provoke recalculation of RSet.
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268 WB.g1StartConcMarkCycle();
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269 while (WB.g1InConcurrentMark()) {
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270 Thread.sleep(1);
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271 }
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272 }
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273
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274 // To force the use of rememebered set entries we need to provoke a GC.
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275 // To induce some fragmentation, and some mixed GCs, we need
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276 // to make a few objects unreachable.
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277 for (int toClean = i * regsToRefresh; toClean < (i + 1) * regsToRefresh; toClean++) {
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278 int to = toClean % regionCount;
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279 // Need to remove all references from all regions to the region 'to'
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280 for (int from = 0; from < regionCount; from++) {
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281 if (to == from) {
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282 continue; // no need to refer to itself
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283 }
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284 for (int rn = 0; rn <= cur; rn++) {
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285 storage[getY(to, from, rn)][getX(to, from, rn)] = null;
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286 }
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287 }
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288 // 'Refresh' storage elements for the region 'to'
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289 // After that loop all 'old' objects in the region 'to'
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290 // should become unreachable.
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291 for (int k = 0; k < K; k++) {
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292 storage[(to * K + k) % storage.length] = new Object[N];
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293 }
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294 }
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295 }
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296 } catch (TimeoutException e) {
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297 System.out.println("%% TIMEOUT!!!");
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298 }
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299 long now = System.currentTimeMillis();
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300 System.out.println("%% Summary");
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301 System.out.println("%% Time spent : " + ((now - start) / 1000) + " seconds");
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302 System.out.println("%% Free memory left : " + Runtime.getRuntime().freeMemory() / KB + "K");
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303 System.out.println("%% Test passed");
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304 }
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305
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306 /**
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307 * Returns X index in the Storage of the reference #rn from the region
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308 * 'from' to the region 'to'.
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309 *
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310 * @param to region # to refer to
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311 * @param from region # to refer from
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312 * @param rn number of reference
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313 *
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314 * @return X index in the range: [0 ... N-1]
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315 */
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316 private int getX(int to, int from, int rn) {
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317 return (rn * regionCount + to) % N;
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318 }
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319
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320 /**
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321 * Returns Y index in the Storage of the reference #rn from the region
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322 * 'from' to the region 'to'.
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323 *
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324 * @param to region # to refer to
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325 * @param from region # to refer from
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326 * @param rn number of reference
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327 *
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328 * @return Y index in the range: [0 ... K*regionCount -1]
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329 */
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330 private int getY(int to, int from, int rn) {
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331 return ((rn * regionCount + to) / N + from * K) % (regionCount * K);
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332 }
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333 }
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334