Mercurial > hg > gc-bench
view src/main/java/org/openjdk/gcbench/fragger/ArrayFragger.java @ 90:14c1bb4faa6e
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author | shade |
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date | Thu, 23 Nov 2017 15:12:49 +0100 |
parents | 583fef4276f5 |
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/* * Copyright (c) 2017, Red Hat Inc. 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. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * 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 org.openjdk.gcbench.fragger; import org.openjdk.gcbench.util.AllocProfileSupport; import org.openjdk.gcbench.util.ratelimit.MultiTokenBucket; import org.openjdk.jmh.annotations.*; import java.util.concurrent.ThreadLocalRandom; import java.util.concurrent.TimeUnit; @Warmup(iterations = 5, time = 1, timeUnit = TimeUnit.SECONDS) @Measurement(iterations = 5, time = 1, timeUnit = TimeUnit.SECONDS) @Fork(value = 1) @BenchmarkMode(Mode.Throughput) @OutputTimeUnit(TimeUnit.SECONDS) @Threads(Threads.MAX) @State(Scope.Benchmark) public class ArrayFragger { @Param("16") int payloadSize; @Param({"1000"}) long ldsMB; @Param({"10"}) int rate; Object[] objects; int count; MultiTokenBucket bucket; Object[] o0; Object[] o16; private int getSizePerCount() { if (AllocProfileSupport.isAvailable()) { long a1 = AllocProfileSupport.getAllocatedBytes(); o0 = new Object[0]; long a2 = AllocProfileSupport.getAllocatedBytes(); o16 = new Object[16]; for (int c = 0; c < 16; c++) { o16[c] = new byte[payloadSize]; } long a3 = AllocProfileSupport.getAllocatedBytes(); long sizeO0 = a2 - a1; long sizeO16 = a3 - a2; return (int) ((sizeO16 - sizeO0) / 16); } else { // best guess return 4 + // array element 16 + payloadSize; // object } } @Setup public void setup() { bucket = new MultiTokenBucket(rate); count = (int) Math.max(1, ldsMB * 1024 * 1024 / getSizePerCount()); objects = new Object[count]; for (int c = 0; c < count; c++) { objects[c] = new byte[payloadSize]; } } @Benchmark public void test() { bucket.limit(); objects[ThreadLocalRandom.current().nextInt(count)] = new byte[payloadSize]; } }