b438cffdb9
Co-authored-by: Vladimir Ivanov <vaivanov@openjdk.org> Reviewed-by: sviswanathan, ecaspole
92 lines
2.9 KiB
Java
92 lines
2.9 KiB
Java
/*
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* Copyright (c) 2023, 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.java.lang;
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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.Benchmark;
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import org.openjdk.jmh.annotations.BenchmarkMode;
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import org.openjdk.jmh.annotations.Fork;
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import org.openjdk.jmh.annotations.Measurement;
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import org.openjdk.jmh.annotations.Mode;
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import org.openjdk.jmh.annotations.OutputTimeUnit;
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import org.openjdk.jmh.annotations.Param;
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import org.openjdk.jmh.annotations.Scope;
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import org.openjdk.jmh.annotations.Setup;
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import org.openjdk.jmh.annotations.State;
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import org.openjdk.jmh.annotations.Warmup;
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import org.openjdk.jmh.runner.Runner;
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import org.openjdk.jmh.runner.options.OptionsBuilder;
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/**
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* Compare array clone with equivalent System.arraycopy-based routines
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*/
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@BenchmarkMode(Mode.AverageTime)
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@OutputTimeUnit(TimeUnit.NANOSECONDS)
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@Warmup(iterations = 2, time = 3, timeUnit = TimeUnit.SECONDS)
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@Measurement(iterations = 15, time = 1, timeUnit = TimeUnit.SECONDS)
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@Fork(1)
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@State(Scope.Thread)
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public class ArrayClone {
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@Param({"0", "10", "100", "1000"})
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int size;
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private byte[] bytes;
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private int[] ints;
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@Setup
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public void setup() {
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bytes = new byte[size];
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ints = new int[size];
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ThreadLocalRandom.current().nextBytes(bytes);
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for (int i = 0; i < ints.length; i++) {
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ints[i] = ThreadLocalRandom.current().nextInt();
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}
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}
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@Benchmark
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public byte[] byteClone() {
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return bytes.clone();
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}
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@Benchmark
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public byte[] byteArraycopy() {
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byte[] copy = new byte[bytes.length];
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System.arraycopy(bytes, 0, copy, 0, bytes.length);
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return copy;
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}
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@Benchmark
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public int[] intClone() {
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return ints.clone();
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}
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@Benchmark
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public int[] intArraycopy() {
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int[] copy = new int[ints.length];
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System.arraycopy(ints, 0, copy, 0, ints.length);
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return copy;
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}
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} |