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/*
* 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
* @requires vm.gc != "Z" & vm.gc != "Shenandoah"
* @library /test/lib
* @modules java.base/jdk.internal.misc
* java.management
* @build sun.hotspot.WhiteBox
* @run driver 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);
}
}
}
}
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