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65 lines
2.3 KiB
Java
65 lines
2.3 KiB
Java
/*
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* Copyright Amazon.com Inc. or its affiliates. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package org.openjdk.bench.java.nio;
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import java.nio.ByteBuffer;
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import java.util.LinkedList;
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import java.util.concurrent.ThreadLocalRandom;
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import java.util.concurrent.TimeUnit;
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import org.openjdk.jmh.annotations.*;
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import org.openjdk.jmh.infra.Blackhole;
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@OutputTimeUnit(TimeUnit.MILLISECONDS)
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@State(Scope.Thread)
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@BenchmarkMode(Mode.AverageTime)
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@Warmup(iterations = 3, time = 1, timeUnit = TimeUnit.SECONDS)
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@Measurement(iterations = 3, time = 1, timeUnit = TimeUnit.SECONDS)
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@Fork(value = 3, jvmArgs = {"-Xmx1g", "-Xms1g", "-XX:+AlwaysPreTouch"})
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public class DirectByteBufferGC {
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@Param({"16384", "65536", "262144", "1048576", "4194304"})
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int count;
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// Make sure all buffers are reachable and available for GC. Buffers
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// directly reference their Cleanables, so we do not want to provide
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// excess GC parallelism opportunities here, this is why reference
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// buffers from a linked list.
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//
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// This exposes the potential GC parallelism problem in Cleaner lists.
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LinkedList<ByteBuffer> buffers;
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@Setup
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public void setup() {
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buffers = new LinkedList<>();
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for (int c = 0; c < count; c++) {
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buffers.add(ByteBuffer.allocateDirect(1));
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}
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}
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@Benchmark
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public void test() {
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System.gc();
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}
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}
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