hotspot/test/gc/arguments/TestMinAndInitialSurvivorRatioFlags.java
author jlahoda
Mon, 13 Feb 2017 09:37:26 +0100
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permissions -rw-r--r--
8173777: Merge javac -Xmodule into javac--patch-module Summary: Merging -Xmodule: functionality into --patch-module. Reviewed-by: jjg, mchung, rfield
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/*
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 * Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 */
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/*
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 * @test TestMinAndInitialSurvivorRatioFlags
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 * @key gc
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 * @summary Verify that MinSurvivorRatio and InitialSurvivorRatio flags work
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 * @library /test/lib
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 * @modules java.base/jdk.internal.misc
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 *          java.management
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 * @build sun.hotspot.WhiteBox
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 * @run main ClassFileInstaller sun.hotspot.WhiteBox
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 * @run driver TestMinAndInitialSurvivorRatioFlags
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 */
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import java.lang.management.MemoryUsage;
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import java.util.Arrays;
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import java.util.Collections;
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import java.util.LinkedList;
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import jdk.test.lib.process.OutputAnalyzer;
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import jdk.test.lib.process.ProcessTools;
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import jdk.test.lib.Utils;
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import sun.hotspot.WhiteBox;
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/* Test verifies that VM can start with any GC when MinSurvivorRatio and
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 * InitialSurvivorRatio flags passed and for Parallel GC it verifies that
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 * after start up survivor ratio equal to InitialSurvivorRatio value and
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 * that actual survivor ratio will never be less than MinSurvivorRatio.
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 */
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public class TestMinAndInitialSurvivorRatioFlags {
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    public static final long M = 1024 * 1024;
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    public static final long HEAP_SIZE = 200 * M;
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    public static final long NEW_SIZE = 100 * M;
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    public static void main(String args[]) throws Exception {
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        LinkedList<String> options = new LinkedList<>(
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                Arrays.asList(Utils.getFilteredTestJavaOpts("-XX:[^ ]*SurvivorRatio=[^ ]+"))
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        );
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        testSurvivorRatio(5, -1, -1, options, true);
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        testSurvivorRatio(10, -1, -1, options, true);
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        testSurvivorRatio(-1, 5, 3, options, true);
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        testSurvivorRatio(-1, 15, 3, options, true);
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        testSurvivorRatio(-1, 15, 3, options, false);
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        testSurvivorRatio(-1, 10, 10, options, true);
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        testSurvivorRatio(-1, 3, 15, options, true);
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        testSurvivorRatio(-1, 3, 15, options, false);
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    }
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    /**
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     * Test that MinSurvivorRatio and InitialSurvivorRatio flags work.
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     *
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     * @param survivorRatio value for -XX:SurvivorRatio option, omitted if negative
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     * @param initRatio value for -XX:InitialSurvivorRatio option, omitted if negative
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     * @param minRatio value for -XX:MinSurvivorRatio option, omitted if negative
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     * @param options additional options for VM
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     * @param useAdaptiveSizePolicy turn on or off UseAdaptiveSizePolicy option
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     */
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    public static void testSurvivorRatio(int survivorRatio,
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            int initRatio,
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            int minRatio,
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            LinkedList<String> options,
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            boolean useAdaptiveSizePolicy) throws Exception {
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        LinkedList<String> vmOptions = new LinkedList<>(options);
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        Collections.addAll(vmOptions,
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                "-Xbootclasspath/a:.",
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                "-XX:+UnlockDiagnosticVMOptions",
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                "-XX:+WhiteBoxAPI",
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                "-XX:MaxNewSize=" + NEW_SIZE, "-XX:NewSize=" + NEW_SIZE,
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                "-Xmx" + HEAP_SIZE, "-Xms" + HEAP_SIZE,
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                (survivorRatio >= 0 ? "-XX:SurvivorRatio=" + survivorRatio : ""),
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                (initRatio >= 0 ? "-XX:InitialSurvivorRatio=" + initRatio : ""),
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                (minRatio >= 0 ? "-XX:MinSurvivorRatio=" + minRatio : ""),
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                (useAdaptiveSizePolicy ? "-XX:+UseAdaptiveSizePolicy" : "-XX:-UseAdaptiveSizePolicy"),
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                SurvivorRatioVerifier.class.getName(),
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                Integer.toString(survivorRatio),
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                Integer.toString(initRatio),
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                Integer.toString(minRatio),
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                Boolean.toString(useAdaptiveSizePolicy)
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        );
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        vmOptions.removeIf((String p) -> p.isEmpty());
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        ProcessBuilder procBuilder = ProcessTools.createJavaProcessBuilder(vmOptions.toArray(new String[vmOptions.size()]));
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        OutputAnalyzer analyzer = new OutputAnalyzer(procBuilder.start());
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        analyzer.shouldHaveExitValue(0);
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    }
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    /**
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     * Class that verifies survivor ratio.
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     * Will be executed in tested VM. Checks initial size of eden and survivor paces with alignment.
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     */
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    public static class SurvivorRatioVerifier {
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        public static WhiteBox wb = WhiteBox.getWhiteBox();
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        public static final int MAX_ITERATIONS = 10;
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        public static final int ARRAY_LENGTH = 10000;
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        public static final int CHUNK_SIZE = 10000;
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        public static byte garbage[][] = new byte[ARRAY_LENGTH][];
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        public static void main(String args[]) throws Exception {
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            if (args.length != 4) {
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                throw new IllegalArgumentException("Expected 4 args: <survivorRatio> <initRatio> <minRatio> <useAdaptiveSizePolicy>");
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            }
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            final int survivorRatio = Integer.valueOf(args[0]);
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            final int initRatio = Integer.valueOf(args[1]);
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            final int minRatio = Integer.valueOf(args[2]);
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            final boolean useAdaptiveSizePolicy = Boolean.valueOf(args[3]);
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            // we stop testing only here to ensure that JVM will accept
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            // both MinSurvivorRatio and InitialSurvivorRatio regardles to GC
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            if (GCTypes.YoungGCType.getYoungGCType() != GCTypes.YoungGCType.PSNew) {
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                System.out.println("Test is only applicable to Parallel GC");
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                return;
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            }
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            // verify initial survivor ratio
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            verifySurvivorRatio(survivorRatio, initRatio, minRatio, useAdaptiveSizePolicy, true);
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            // force GC
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            AllocationHelper allocator = new AllocationHelper(MAX_ITERATIONS, ARRAY_LENGTH, CHUNK_SIZE,
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                    () -> (verifySurvivorRatio(survivorRatio, initRatio, minRatio, useAdaptiveSizePolicy, false)));
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            allocator.allocateMemoryAndVerify();
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        }
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        /**
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         * Verify actual survivor ratio.
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         *
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         * @param survivorRatio value of SurvivorRatio option, omitted if negative
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         * @param initRatio value of InitialSurvivorRatio option, omitted if negative
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         * @param minRatio value of MinSurvivorRatio option, omitted if negative
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         * @param useAdaptiveSizePolicy value of UseAdaptiveSizePolicy option
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         * @param verifyInitialRatio true if we are going to verify initial ratio
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         */
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        public static Void verifySurvivorRatio(int survivorRatio,
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                int initRatio,
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                int minRatio,
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                boolean useAdaptiveSizePolicy,
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                boolean verifyInitialRatio) {
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            MemoryUsage edenUsage = HeapRegionUsageTool.getEdenUsage();
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            MemoryUsage survivorUsage = HeapRegionUsageTool.getSurvivorUsage();
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            long alignedNewSize = edenUsage.getMax() + 2 * survivorUsage.getMax();
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            long generationAlignment = wb.psHeapGenerationAlignment();
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            if (survivorRatio >= 0) {
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                // -XX:SurvivorRatio was passed to JVM, actual ratio should be SurvivorRatio + 2
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                long expectedSize = HeapRegionUsageTool.alignDown(alignedNewSize / (survivorRatio + 2),
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                        generationAlignment);
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                if (survivorUsage.getCommitted() != expectedSize) {
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                    throw new RuntimeException("Expected survivor size is: " + expectedSize
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                            + ", but observed size is: " + survivorUsage.getCommitted());
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                }
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            } else if (verifyInitialRatio || !useAdaptiveSizePolicy) {
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                // In case of initial ratio verification or disabled adaptive size policy
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                // ratio should be equal to InitialSurvivorRatio value
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                long expectedSize = HeapRegionUsageTool.alignDown(alignedNewSize / initRatio,
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                        generationAlignment);
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                if (survivorUsage.getCommitted() != expectedSize) {
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                    throw new RuntimeException("Expected survivor size is: " + expectedSize
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                            + ", but observed size is: " + survivorUsage.getCommitted());
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                }
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            } else {
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                // In any other case actual survivor ratio should not be lower than MinSurvivorRatio
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                // or is should be equal to InitialSurvivorRatio
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                long expectedMinSize = HeapRegionUsageTool.alignDown(alignedNewSize / minRatio,
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                        generationAlignment);
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                long expectedInitSize = HeapRegionUsageTool.alignDown(alignedNewSize / initRatio,
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                        generationAlignment);
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                if (survivorUsage.getCommitted() != expectedInitSize
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                        && survivorUsage.getCommitted() < expectedMinSize) {
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                    throw new RuntimeException("Expected survivor size should be " + expectedMinSize
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                            + " or should be greater then " + expectedMinSize
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                            + ", but observer survivor size is " + survivorUsage.getCommitted());
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                }
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            }
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            return null;
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        }
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    }
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}