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8132721: Add tests which check that heap counters work as expected during Humongous allocations

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Reviewed-by: jmasa, tschatzl, dfazunen
This commit is contained in:
Kirill Zhaldybin 2016-02-02 18:06:14 +03:00
parent 00aa34d788
commit 5c9133fb92
1 changed files with 193 additions and 0 deletions
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hotspot/test/gc/g1/humongousObjects/TestHeapCounters.java Normal file
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/*
* Copyright (c) 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.
*
*/
package gc.g1.humongousObjects;
import gc.testlibrary.Helpers;
import jdk.test.lib.Asserts;
import sun.hotspot.WhiteBox;
import java.lang.management.GarbageCollectorMXBean;
import java.lang.management.ManagementFactory;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
/**
* @test TestHeapCounters
* @summary Checks that heap counters work as expected after humongous allocations/deallocations
* @requires vm.gc=="G1" | vm.gc=="null"
* @library /testlibrary /test/lib /
* @modules java.management
* @build sun.hotspot.WhiteBox
* gc.testlibrary.Helpers
* gc.g1.humongousObjects.TestHeapCounters
* @run driver ClassFileInstaller sun.hotspot.WhiteBox
* sun.hotspot.WhiteBox$WhiteBoxPermission
*
* @run main/othervm -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:.
* -Xmx128m -Xms128m
* -XX:G1HeapRegionSize=1M -XX:InitiatingHeapOccupancyPercent=100 -XX:-G1UseAdaptiveIHOP
* -Xlog:gc -Xlog:gc:file=TestHeapCountersRuntime.gc.log
* gc.g1.humongousObjects.TestHeapCounters RUNTIME_COUNTER
*
* @run main/othervm -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:.
* -Xmx128m -Xms128m
* -XX:G1HeapRegionSize=1M -XX:InitiatingHeapOccupancyPercent=100 -XX:-G1UseAdaptiveIHOP
* -Xlog:gc -Xlog:gc:file=TestHeapCountersMXBean.gc.log
* gc.g1.humongousObjects.TestHeapCounters MX_BEAN_COUNTER
*/
public class TestHeapCounters {
private static final WhiteBox WHITE_BOX = WhiteBox.getWhiteBox();
private static final int G1_REGION_SIZE = WHITE_BOX.g1RegionSize();
private static final int HALF_G1_REGION_SIZE = G1_REGION_SIZE / 2;
// Since during deallocation GC could free (very unlikely) some non-humongous data this value relaxes amount of
// memory we expect to be freed.
private static final double ALLOCATION_SIZE_TOLERANCE_FACTOR = 0.85D;
private enum MemoryCounter {
MX_BEAN_COUNTER {
@Override
public long getUsedMemory() {
return ManagementFactory.getMemoryMXBean().getHeapMemoryUsage().getUsed();
}
},
RUNTIME_COUNTER {
@Override
public long getUsedMemory() {
return Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory();
}
};
public abstract long getUsedMemory();
}
private static class Allocation {
private byte[] allocation;
public final long expectedSize;
public Allocation(int allocationSize, long allocationExpectedSize) {
allocation = new byte[allocationSize];
expectedSize = allocationExpectedSize;
System.out.println(String.format("Object size is %d; Object is %shumongous",
WHITE_BOX.getObjectSize(allocation),
(WHITE_BOX.g1IsHumongous(allocation) ? "" : "non-")));
selfTest();
}
private void selfTest() {
boolean isHumongous = WHITE_BOX.getObjectSize(allocation) > HALF_G1_REGION_SIZE;
boolean shouldBeHumongous = WHITE_BOX.g1IsHumongous(allocation);
// Sanity check
Asserts.assertEquals(isHumongous, shouldBeHumongous,
String.format("Test Bug: Object of size %d is expected to be %shumongous but it is not",
WHITE_BOX.getObjectSize(allocation), (shouldBeHumongous ? "" : "non-")));
}
public void forgetAllocation() {
allocation = null;
}
}
public static void main(String[] args) {
if (args.length != 1) {
throw new Error("Expected memory counter name wasn't provided as command line argument");
}
MemoryCounter memoryCounter = MemoryCounter.valueOf(args[0].toUpperCase());
int byteArrayMemoryOverhead = Helpers.detectByteArrayAllocationOverhead();
// Largest non-humongous byte[]
int maxByteArrayNonHumongousSize = HALF_G1_REGION_SIZE - byteArrayMemoryOverhead;
// Maximum byte[] that takes one region
int maxByteArrayOneRegionSize = G1_REGION_SIZE - byteArrayMemoryOverhead;
List<Integer> allocationSizes = Arrays.asList(
(int) maxByteArrayNonHumongousSize + 1,
(int) (0.8f * maxByteArrayOneRegionSize),
(int) (maxByteArrayOneRegionSize),
(int) (1.2f * maxByteArrayOneRegionSize),
(int) (1.5f * maxByteArrayOneRegionSize),
(int) (1.7f * maxByteArrayOneRegionSize),
(int) (2.0f * maxByteArrayOneRegionSize),
(int) (2.5f * maxByteArrayOneRegionSize)
);
List<Allocation> allocations = new ArrayList<>();
List<GarbageCollectorMXBean> gcBeans =
ManagementFactory.getGarbageCollectorMXBeans();
long gcCountBefore = gcBeans.stream().mapToLong(GarbageCollectorMXBean::getCollectionCount).sum();
System.out.println("Starting allocations - no GC should happen until we finish them");
for (int allocationSize : allocationSizes) {
long usedMemoryBefore = memoryCounter.getUsedMemory();
long expectedAllocationSize = (long) Math.ceil((double) allocationSize / G1_REGION_SIZE) * G1_REGION_SIZE;
allocations.add(new Allocation(allocationSize, expectedAllocationSize));
long usedMemoryAfter = memoryCounter.getUsedMemory();
System.out.format("Expected allocation size: %d\nUsed memory before allocation: %d\n"
+ "Used memory after allocation: %d\n",
expectedAllocationSize, usedMemoryBefore, usedMemoryAfter);
long gcCountNow = gcBeans.stream().mapToLong(GarbageCollectorMXBean::getCollectionCount).sum();
if (gcCountNow == gcCountBefore) {
// We should allocate at least allocation.expectedSize
Asserts.assertGreaterThanOrEqual(usedMemoryAfter - usedMemoryBefore, expectedAllocationSize,
"Counter of type " + memoryCounter.getClass().getSimpleName() +
" returned wrong allocation size");
} else {
System.out.println("GC happened during allocation so the check is skipped");
gcCountBefore = gcCountNow;
}
}
System.out.println("Finished allocations - no GC should have happened before this line");
allocations.stream().forEach(allocation -> {
long usedMemoryBefore = memoryCounter.getUsedMemory();
allocation.forgetAllocation();
WHITE_BOX.fullGC();
long usedMemoryAfter = memoryCounter.getUsedMemory();
// We should free at least allocation.expectedSize * ALLOCATION_SIZE_TOLERANCE_FACTOR
Asserts.assertGreaterThanOrEqual(usedMemoryBefore - usedMemoryAfter,
(long) (allocation.expectedSize * ALLOCATION_SIZE_TOLERANCE_FACTOR),
"Counter of type " + memoryCounter.getClass().getSimpleName() + " returned wrong allocation size");
});
}
}