| /* |
| * 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.plab.lib; |
| |
| import jdk.test.lib.Platform; |
| import sun.hotspot.WhiteBox; |
| |
| /** |
| * This application is part of PLAB Resize test. |
| * The application allocates objects in 3 iterations: |
| * 1. Objects of fixed size |
| * 2. Objects of decreasing size |
| * 3. Objects of increasing size |
| * The application doesn't have any assumptions about expected behavior. |
| * It's supposed to be executed by a test which should set up test parameters (object sizes, number of allocations, etc) |
| * and VM flags including flags turning GC logging on. The test will then check the produced log. |
| * |
| * Expects the following properties to be set: |
| * - iterations - amount of iteration per cycle. |
| * - chunk.size - size of objects to be allocated |
| */ |
| final public class AppPLABResize { |
| |
| // Memory to be promoted by PLAB for one thread. |
| private static final long MEM_ALLOC_WORDS = 32768; |
| // Defined by properties. |
| private static final int ITERATIONS = Integer.getInteger("iterations"); |
| private static final long CHUNK = Long.getLong("chunk.size"); |
| |
| private static final WhiteBox WHITE_BOX = WhiteBox.getWhiteBox(); |
| |
| /** |
| * Main method for AppPLABResizing. Application expect for next properties: |
| * iterations, chunk.size and threads. |
| * |
| * @param args |
| */ |
| public static void main(String[] args) { |
| |
| if (ITERATIONS == 0 || CHUNK == 0) { |
| throw new IllegalArgumentException("Properties should be set"); |
| } |
| |
| long wordSize = Platform.is32bit() ? 4l : 8l; |
| // PLAB size is shared between threads. |
| long initialMemorySize = wordSize * MEM_ALLOC_WORDS; |
| |
| // Expect changing memory to half during all iterations. |
| long memChangeStep = initialMemorySize / 2 / ITERATIONS; |
| |
| WHITE_BOX.fullGC(); |
| |
| // Warm the PLAB. Fill memory ITERATIONS times without changing memory size. |
| iterateAllocation(initialMemorySize, 0); |
| // Fill memory ITERATIONS times. |
| // Initial size is initialMemorySize and step is -memChangeStep |
| iterateAllocation(initialMemorySize, -memChangeStep); |
| // Fill memory ITERATIONS times. |
| // Initial size is memoryAfterChanging, step is memChangeStep. |
| // Memory size at start should be greater then last size on previous step. |
| // Last size on previous step is initialMemorySize - memChangeStep*(ITERATIONS - 1) |
| long memoryAfterChanging = initialMemorySize - memChangeStep * (ITERATIONS - 2); |
| iterateAllocation(memoryAfterChanging, memChangeStep); |
| } |
| |
| private static void iterateAllocation(long memoryToFill, long change) { |
| int items; |
| if (change > 0) { |
| items = (int) ((memoryToFill + change * ITERATIONS) / CHUNK) + 1; |
| } else { |
| items = (int) (memoryToFill / CHUNK) + 1; |
| } |
| |
| long currentMemToFill = memoryToFill; |
| for (int iteration = 0; iteration < ITERATIONS; ++iteration) { |
| MemoryConsumer storage = new MemoryConsumer(items, (int) CHUNK); |
| storage.consume(currentMemToFill); |
| // Promote all objects to survivor |
| WHITE_BOX.youngGC(); |
| storage.clear(); |
| currentMemToFill += change; |
| } |
| } |
| } |