| /* |
| * Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * @test TestSurvivorRatioFlag |
| * @key gc |
| * @summary Verify that actual survivor ratio is equal to specified SurvivorRatio value |
| * @library /test/lib |
| * @modules java.base/jdk.internal.misc |
| * java.management |
| * @build sun.hotspot.WhiteBox |
| * @run main ClassFileInstaller sun.hotspot.WhiteBox |
| * @run driver TestSurvivorRatioFlag |
| */ |
| |
| import java.lang.management.MemoryUsage; |
| import java.util.Arrays; |
| import java.util.Collections; |
| import java.util.LinkedList; |
| import jdk.test.lib.process.OutputAnalyzer; |
| import jdk.test.lib.process.ProcessTools; |
| import jdk.test.lib.Utils; |
| import sun.hotspot.WhiteBox; |
| |
| public class TestSurvivorRatioFlag { |
| |
| public static final long M = 1024 * 1024; |
| public static final long HEAP_SIZE = 200 * M; |
| public static final long NEW_SIZE = 100 * M; |
| |
| public static void main(String args[]) throws Exception { |
| LinkedList<String> options = new LinkedList<>( |
| Arrays.asList(Utils.getFilteredTestJavaOpts("-XX:[^ ]*SurvivorRatio=[^ ]+")) |
| ); |
| |
| testSurvivorRatio(3, options); |
| testSurvivorRatio(6, options); |
| testSurvivorRatio(10, options); |
| testSurvivorRatio(15, options); |
| testSurvivorRatio(20, options); |
| } |
| |
| /** |
| * Verify that actual survivor ratio equal to specified. |
| * |
| * @param ratio survivor ratio that be verified |
| * @param options additional options to JVM |
| */ |
| public static void testSurvivorRatio(int ratio, LinkedList<String> options) throws Exception { |
| |
| LinkedList<String> vmOptions = new LinkedList<>(options); |
| |
| Collections.addAll(vmOptions, |
| "-Xbootclasspath/a:.", |
| "--add-exports=java.base/jdk.internal.misc=ALL-UNNAMED", |
| "-XX:+UnlockDiagnosticVMOptions", |
| "-XX:+WhiteBoxAPI", |
| "-XX:GCLockerEdenExpansionPercent=0", |
| "-XX:MaxNewSize=" + NEW_SIZE, |
| "-XX:NewSize=" + NEW_SIZE, |
| "-Xmx" + HEAP_SIZE, |
| "-Xms" + HEAP_SIZE, |
| "-XX:SurvivorRatio=" + ratio, |
| SurvivorRatioVerifier.class.getName(), |
| Integer.toString(ratio) |
| ); |
| |
| ProcessBuilder procBuilder = ProcessTools.createJavaProcessBuilder(vmOptions.toArray(new String[vmOptions.size()])); |
| OutputAnalyzer analyzer = new OutputAnalyzer(procBuilder.start()); |
| analyzer.shouldHaveExitValue(0); |
| } |
| |
| /** |
| * Class that verifies survivor ratio. |
| */ |
| public static class SurvivorRatioVerifier { |
| |
| static WhiteBox wb = WhiteBox.getWhiteBox(); |
| |
| public static final int MAX_ITERATIONS = 10; |
| public static final int ARRAY_LENGTH = 10000; |
| public static final int CHUNK_SIZE = 10000; |
| |
| public static void main(String args[]) throws Exception { |
| if (args.length != 1) { |
| throw new IllegalArgumentException("Expected 1 arg: <ratio>"); |
| } |
| final int ratio = Integer.valueOf(args[0]); |
| |
| AllocationHelper allocator = new AllocationHelper(MAX_ITERATIONS, ARRAY_LENGTH, CHUNK_SIZE, () -> (verifySurvivorRatio(ratio))); |
| allocator.allocateMemoryAndVerify(); |
| } |
| |
| /** |
| * Verify that actual survivor ratio is equal to expected. |
| * Depending on selected young GC we verify that: |
| * - for DefNew and ParNew: eden_size / survivor_size is close to expectedRatio; |
| * - for PSNew: survivor_size equal to young_gen_size / expectedRatio; |
| * - for G1: survivor_regions <= young_list_length / expectedRatio. |
| */ |
| public static Void verifySurvivorRatio(int expectedRatio) { |
| GCTypes.YoungGCType type = GCTypes.YoungGCType.getYoungGCType(); |
| switch (type) { |
| case DefNew: |
| case ParNew: |
| verifyDefNewSurvivorRatio(expectedRatio); |
| break; |
| case PSNew: |
| verifyPSSurvivorRatio(expectedRatio); |
| break; |
| case G1: |
| verifyG1SurvivorRatio(expectedRatio); |
| break; |
| default: |
| throw new RuntimeException("Unexpected young GC type"); |
| } |
| return null; |
| } |
| |
| private static void verifyDefNewSurvivorRatio(int expectedRatio) { |
| MemoryUsage edenUsage = HeapRegionUsageTool.getEdenUsage(); |
| MemoryUsage survivorUsage = HeapRegionUsageTool.getSurvivorUsage(); |
| |
| int actualRatio = (int) (edenUsage.getCommitted() / survivorUsage.getCommitted()); |
| if (Math.abs(actualRatio - expectedRatio) > 1) { |
| throw new RuntimeException("Expected survivor ratio is: " + expectedRatio |
| + ", but observed ratio is: " + actualRatio); |
| } |
| } |
| |
| private static void verifyPSSurvivorRatio(int expectedRatio) { |
| MemoryUsage edenUsage = HeapRegionUsageTool.getEdenUsage(); |
| MemoryUsage survivorUsage = HeapRegionUsageTool.getSurvivorUsage(); |
| |
| long youngGenSize = edenUsage.getMax() + 2 * survivorUsage.getMax(); |
| // for Paralle GC Min/InitialSurvivorRatio = SurvivorRatio + 2 |
| long expectedSize = HeapRegionUsageTool.alignDown(youngGenSize / (expectedRatio + 2), |
| wb.psHeapGenerationAlignment()); |
| |
| if (expectedSize != survivorUsage.getCommitted()) { |
| throw new RuntimeException("Expected survivor size is: " + expectedSize |
| + ", but observed size is: " + survivorUsage.getCommitted()); |
| } |
| } |
| |
| private static void verifyG1SurvivorRatio(int expectedRatio) { |
| MemoryUsage survivorUsage = HeapRegionUsageTool.getSurvivorUsage(); |
| |
| int regionSize = wb.g1RegionSize(); |
| int youngListLength = (int) Math.max(NEW_SIZE / regionSize, 1); |
| int expectedSurvivorRegions = (int) Math.ceil(youngListLength / (double) expectedRatio); |
| int observedSurvivorRegions = (int) (survivorUsage.getCommitted() / regionSize); |
| |
| if (expectedSurvivorRegions < observedSurvivorRegions) { |
| throw new RuntimeException("Expected amount of G1 survivor regions is " |
| + expectedSurvivorRegions + ", but observed " |
| + observedSurvivorRegions); |
| } |
| } |
| } |
| } |