90 lines
2.6 KiB
Java
90 lines
2.6 KiB
Java
/*
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* Copyright (c) 2024, Oracle and/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.sun.misc;
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import java.lang.reflect.Field;
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import java.util.concurrent.TimeUnit;
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import jdk.internal.misc.Unsafe;
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import org.openjdk.jmh.annotations.*;
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@BenchmarkMode(Mode.AverageTime)
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@Warmup(iterations = 5, time = 500, timeUnit = TimeUnit.MILLISECONDS)
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@Measurement(iterations = 10, time = 500, timeUnit = TimeUnit.MILLISECONDS)
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@State(org.openjdk.jmh.annotations.Scope.Thread)
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@OutputTimeUnit(TimeUnit.NANOSECONDS)
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@SuppressWarnings("removal")
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public class UnsafeOps {
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static final Unsafe U;
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static {
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try {
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Field f = Unsafe.class.getDeclaredField("theUnsafe");
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f.setAccessible(true);
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U = (Unsafe) f.get(null);
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} catch (ReflectiveOperationException ex) {
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throw new IllegalStateException();
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}
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}
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private static class TestClass {
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long value;
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}
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private Object object;
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private long valueOffset;
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private long address;
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@Setup
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public void setup() throws Exception {
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object = new TestClass();
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Field f = TestClass.class.getDeclaredField("value");
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valueOffset = U.objectFieldOffset(f);
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address = U.allocateMemory(1000);
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}
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@TearDown
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public void finish() {
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U.freeMemory(address);
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}
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@Benchmark
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public void putLongOnHeap() {
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U.putLong(object, 0, 99);
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}
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@Benchmark
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public long getLongOnHeap() {
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return U.getLong(object, 0);
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}
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@Benchmark
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public void putLongOffHeap() {
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U.putLong(null, address, 99);
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}
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@Benchmark
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public long getLongOffHeap() {
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return U.getLong(null, address);
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}
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}
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