| /* |
| * Copyright (c) 2015, 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; |
| |
| /** |
| * @test TestHumongousThreshold |
| * @summary Checks that objects larger than half a region are allocated as humongous |
| * @requires vm.gc=="G1" | vm.gc=="null" |
| * @library /testlibrary /test/lib / |
| * @modules java.management |
| * @build sun.hotspot.WhiteBox |
| * gc.testlibrary.Helpers |
| * gc.g1.humongousObjects.TestHumongousThreshold |
| * @run driver ClassFileInstaller sun.hotspot.WhiteBox |
| * sun.hotspot.WhiteBox$WhiteBoxPermission |
| * |
| * @run main/othervm -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:. |
| * -XX:G1HeapRegionSize=1M |
| * gc.g1.humongousObjects.TestHumongousThreshold |
| * |
| * @run main/othervm -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:. |
| * -XX:G1HeapRegionSize=2M |
| * gc.g1.humongousObjects.TestHumongousThreshold |
| * |
| * @run main/othervm -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:. |
| * -XX:G1HeapRegionSize=4M |
| * gc.g1.humongousObjects.TestHumongousThreshold |
| * |
| * @run main/othervm -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:. |
| * -XX:G1HeapRegionSize=8M |
| * gc.g1.humongousObjects.TestHumongousThreshold |
| * |
| * @run main/othervm -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:. |
| * -Xms128M -XX:G1HeapRegionSize=16M |
| * gc.g1.humongousObjects.TestHumongousThreshold |
| * |
| * @run main/othervm -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:. |
| * -Xms200M -XX:G1HeapRegionSize=32M |
| * gc.g1.humongousObjects.TestHumongousThreshold |
| * |
| */ |
| |
| public class TestHumongousThreshold { |
| private static final WhiteBox WHITE_BOX = WhiteBox.getWhiteBox(); |
| private static final int REGION_SIZE = WHITE_BOX.g1RegionSize(); |
| private static final int MAX_CONTINUOUS_SIZE_CHECK = 129; |
| private static final int NON_HUMONGOUS_DIVIDER = 10; |
| |
| /** |
| * The method allocates byte[] with specified size and checks that: |
| * 1. byte[] is allocated as we specified in expectedHumongous. |
| * 2. byte[] is allocated as humongous if its size is large than a half of region and non-humongous otherwise. |
| * It uses WB to obtain the size of created byte[]. Only objects larger than half of region are expected |
| * to be humongous. |
| * |
| * @param arraySize size of allocation |
| * @param expectedHumongous expected humongous/non-humongous allocation |
| * @return allocated byte array |
| */ |
| |
| private static byte[] allocateAndCheck(int arraySize, boolean expectedHumongous) { |
| byte[] storage = new byte[arraySize]; |
| long objectSize = WHITE_BOX.getObjectSize(storage); |
| boolean shouldBeHumongous = objectSize > (REGION_SIZE / 2); |
| |
| Asserts.assertEquals(expectedHumongous, shouldBeHumongous, "Despite we expected this object to be " |
| + (expectedHumongous ? "humongous" : "non-humongous") + " it appeared otherwise when we checked " |
| + "object size - likely test bug; Allocation size = " + arraySize + "; Object size = " + objectSize |
| + "; region size = " + REGION_SIZE); |
| |
| Asserts.assertEquals(WHITE_BOX.g1IsHumongous(storage), shouldBeHumongous, |
| "Object should be allocated as " + (shouldBeHumongous ? "humongous" |
| : "non-humongous") + " but it wasn't; Allocation size = " + arraySize + "; Object size = " |
| + objectSize + "; region size = " + REGION_SIZE); |
| return storage; |
| } |
| |
| public static void main(String[] args) { |
| int byteArrayMemoryOverhead = Helpers.detectByteArrayAllocationOverhead(); |
| |
| // Largest non-humongous byte[] |
| int maxByteArrayNonHumongousSize = (REGION_SIZE / 2) - byteArrayMemoryOverhead; |
| |
| // Increment for non-humongous testing |
| int nonHumongousStep = maxByteArrayNonHumongousSize / NON_HUMONGOUS_DIVIDER; |
| |
| // Maximum byte[] that takes one region |
| int maxByteArrayOneRegionSize = REGION_SIZE - byteArrayMemoryOverhead; |
| |
| // Sizes in regions |
| // i,e, 1.0f means one region, 1.5f means one and half region etc |
| float[] humongousFactors = {0.8f, 1.0f, 1.2f, 1.5f, 1.7f, 2.0f, 2.5f}; |
| |
| // Some diagnostic output |
| System.out.format("%s started%n", TestHumongousThreshold.class.getName()); |
| System.out.format("Actual G1 region size %d%n", REGION_SIZE); |
| System.out.format("byte[] memory overhead %d%n", byteArrayMemoryOverhead); |
| |
| // Non-humongous allocations |
| System.out.format("Doing non-humongous allocations%n"); |
| |
| // Testing allocations with byte[] with length from 0 to MAX_CONTINUOUS_SIZE_CHECK |
| System.out.format("Testing allocations with byte[] with length from 0 to %d%n", MAX_CONTINUOUS_SIZE_CHECK); |
| for (int i = 0; i < MAX_CONTINUOUS_SIZE_CHECK; ++i) { |
| allocateAndCheck(i, false); |
| } |
| |
| // Testing allocations with byte[] with length from 0 to nonHumongousStep * NON_HUMONGOUS_DIVIDER |
| System.out.format("Testing allocations with byte[] with length from 0 to %d with step %d%n", |
| nonHumongousStep * NON_HUMONGOUS_DIVIDER, nonHumongousStep); |
| for (int i = 0; i < NON_HUMONGOUS_DIVIDER; ++i) { |
| allocateAndCheck(i * nonHumongousStep, false); |
| } |
| |
| // Testing allocations with byte[] of maximum non-humongous length |
| System.out.format("Testing allocations with byte[] of maximum non-humongous length %d%n", |
| maxByteArrayNonHumongousSize); |
| allocateAndCheck(maxByteArrayNonHumongousSize, false); |
| |
| // Humongous allocations |
| System.out.format("Doing humongous allocations%n"); |
| // Testing with minimum humongous object |
| System.out.format("Testing with byte[] of minimum humongous object %d%n", maxByteArrayNonHumongousSize + 1); |
| allocateAndCheck(maxByteArrayNonHumongousSize + 1, true); |
| |
| // Testing allocations with byte[] with length from (maxByteArrayNonHumongousSize + 1) to |
| // (maxByteArrayNonHumongousSize + 1 + MAX_CONTINUOUS_SIZE_CHECK) |
| System.out.format("Testing allocations with byte[] with length from %d to %d%n", |
| maxByteArrayNonHumongousSize + 1, maxByteArrayNonHumongousSize + 1 + MAX_CONTINUOUS_SIZE_CHECK); |
| for (int i = 0; i < MAX_CONTINUOUS_SIZE_CHECK; ++i) { |
| allocateAndCheck(maxByteArrayNonHumongousSize + 1 + i, true); |
| } |
| |
| // Checking that large (more than a half of region size) objects are humongous |
| System.out.format("Checking that large (more than a half of region size) objects are humongous%n"); |
| for (float factor : humongousFactors) { |
| allocateAndCheck((int) (maxByteArrayOneRegionSize * factor), true); |
| } |
| } |
| } |