| /* |
| * 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 |
| * @library /test/lib / |
| * @modules java.base/jdk.internal.misc |
| * @modules java.management |
| * @build sun.hotspot.WhiteBox |
| * @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"); |
| }); |
| } |
| } |