1 /* 2 * Copyright (c) 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 TestSurvivorRatioFlag 26 * @key gc 27 * @summary Verify that actual survivor ratio is equal to specified SurvivorRatio value 28 * @library /test/lib 29 * @modules java.base/jdk.internal.misc 30 * java.management 31 * @build sun.hotspot.WhiteBox 32 * @run main ClassFileInstaller sun.hotspot.WhiteBox 33 * @run driver TestSurvivorRatioFlag 34 */ 35 36 import java.lang.management.MemoryUsage; 37 import java.util.Arrays; 38 import java.util.Collections; 39 import java.util.LinkedList; 40 import jdk.test.lib.process.OutputAnalyzer; 41 import jdk.test.lib.process.ProcessTools; 42 import jdk.test.lib.Utils; 43 import sun.hotspot.WhiteBox; 44 45 public class TestSurvivorRatioFlag { 46 47 public static final long M = 1024 * 1024; 48 public static final long HEAP_SIZE = 200 * M; 49 public static final long NEW_SIZE = 100 * M; 50 51 public static void main(String args[]) throws Exception { 52 LinkedList<String> options = new LinkedList<>( 53 Arrays.asList(Utils.getFilteredTestJavaOpts("-XX:[^ ]*SurvivorRatio=[^ ]+")) 54 ); 55 56 testSurvivorRatio(3, options); 57 testSurvivorRatio(6, options); 58 testSurvivorRatio(10, options); 59 testSurvivorRatio(15, options); 60 testSurvivorRatio(20, options); 61 } 62 63 /** 64 * Verify that actual survivor ratio equal to specified. 65 * 66 * @param ratio survivor ratio that be verified 67 * @param options additional options to JVM 68 */ 69 public static void testSurvivorRatio(int ratio, LinkedList<String> options) throws Exception { 70 71 LinkedList<String> vmOptions = new LinkedList<>(options); 72 73 Collections.addAll(vmOptions, 74 "-Xbootclasspath/a:.", 75 "-XaddExports:java.base/jdk.internal.misc=ALL-UNNAMED", 76 "-XX:+UnlockDiagnosticVMOptions", 77 "-XX:+WhiteBoxAPI", 78 "-XX:GCLockerEdenExpansionPercent=0", 79 "-XX:MaxNewSize=" + NEW_SIZE, 80 "-XX:NewSize=" + NEW_SIZE, 81 "-Xmx" + HEAP_SIZE, 82 "-Xms" + HEAP_SIZE, 83 "-XX:SurvivorRatio=" + ratio, 84 SurvivorRatioVerifier.class.getName(), 85 Integer.toString(ratio) 86 ); 87 88 ProcessBuilder procBuilder = ProcessTools.createJavaProcessBuilder(vmOptions.toArray(new String[vmOptions.size()])); 89 OutputAnalyzer analyzer = new OutputAnalyzer(procBuilder.start()); 90 analyzer.shouldHaveExitValue(0); 91 } 92 93 /** 94 * Class that verifies survivor ratio. 95 */ 96 public static class SurvivorRatioVerifier { 97 98 static WhiteBox wb = WhiteBox.getWhiteBox(); 99 100 public static final int MAX_ITERATIONS = 10; 101 public static final int ARRAY_LENGTH = 10000; 102 public static final int CHUNK_SIZE = 10000; 103 104 public static void main(String args[]) throws Exception { 105 if (args.length != 1) { 106 throw new IllegalArgumentException("Expected 1 arg: <ratio>"); 107 } 108 final int ratio = Integer.valueOf(args[0]); 109 110 AllocationHelper allocator = new AllocationHelper(MAX_ITERATIONS, ARRAY_LENGTH, CHUNK_SIZE, () -> (verifySurvivorRatio(ratio))); 111 allocator.allocateMemoryAndVerify(); 112 } 113 114 /** 115 * Verify that actual survivor ratio is equal to expected. 116 * Depending on selected young GC we verify that: 117 * - for DefNew and ParNew: eden_size / survivor_size is close to expectedRatio; 118 * - for PSNew: survivor_size equal to young_gen_size / expectedRatio; 119 * - for G1: survivor_regions <= young_list_length / expectedRatio. 120 */ 121 public static Void verifySurvivorRatio(int expectedRatio) { 122 GCTypes.YoungGCType type = GCTypes.YoungGCType.getYoungGCType(); 123 switch (type) { 124 case DefNew: 125 case ParNew: 126 verifyDefNewSurvivorRatio(expectedRatio); 127 break; 128 case PSNew: 129 verifyPSSurvivorRatio(expectedRatio); 130 break; 131 case G1: 132 verifyG1SurvivorRatio(expectedRatio); 133 break; 134 default: 135 throw new RuntimeException("Unexpected young GC type"); 136 } 137 return null; 138 } 139 140 private static void verifyDefNewSurvivorRatio(int expectedRatio) { 141 MemoryUsage edenUsage = HeapRegionUsageTool.getEdenUsage(); 142 MemoryUsage survivorUsage = HeapRegionUsageTool.getSurvivorUsage(); 143 144 int actualRatio = (int) (edenUsage.getCommitted() / survivorUsage.getCommitted()); 145 if (Math.abs(actualRatio - expectedRatio) > 1) { 146 throw new RuntimeException("Expected survivor ratio is: " + expectedRatio 147 + ", but observed ratio is: " + actualRatio); 148 } 149 } 150 151 private static void verifyPSSurvivorRatio(int expectedRatio) { 152 MemoryUsage edenUsage = HeapRegionUsageTool.getEdenUsage(); 153 MemoryUsage survivorUsage = HeapRegionUsageTool.getSurvivorUsage(); 154 155 long youngGenSize = edenUsage.getMax() + 2 * survivorUsage.getMax(); 156 // for Paralle GC Min/InitialSurvivorRatio = SurvivorRatio + 2 157 long expectedSize = HeapRegionUsageTool.alignDown(youngGenSize / (expectedRatio + 2), 158 wb.psHeapGenerationAlignment()); 159 160 if (expectedSize != survivorUsage.getCommitted()) { 161 throw new RuntimeException("Expected survivor size is: " + expectedSize 162 + ", but observed size is: " + survivorUsage.getCommitted()); 163 } 164 } 165 166 private static void verifyG1SurvivorRatio(int expectedRatio) { 167 MemoryUsage survivorUsage = HeapRegionUsageTool.getSurvivorUsage(); 168 169 int regionSize = wb.g1RegionSize(); 170 int youngListLength = (int) Math.max(NEW_SIZE / regionSize, 1); 171 int expectedSurvivorRegions = (int) Math.ceil(youngListLength / (double) expectedRatio); 172 int observedSurvivorRegions = (int) (survivorUsage.getCommitted() / regionSize); 173 174 if (expectedSurvivorRegions < observedSurvivorRegions) { 175 throw new RuntimeException("Expected amount of G1 survivor regions is " 176 + expectedSurvivorRegions + ", but observed " 177 + observedSurvivorRegions); 178 } 179 } 180 } 181 }