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8302315: Examine cost of clone of primitive arrays compared to arraycopy

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Reviewed-by: alanb
This commit is contained in:
Claes Redestad 2023-02-18 15:17:57 +00:00
parent 53be5dc486
commit d6716d2e54
2 changed files with 108 additions and 71 deletions
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test/micro/org/openjdk/bench/java/lang/ArrayClone.java Normal file
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/*
* Copyright (c) 2023, 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 org.openjdk.bench.java.lang;
import java.util.concurrent.ThreadLocalRandom;
import java.util.concurrent.TimeUnit;
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Fork;
import org.openjdk.jmh.annotations.Measurement;
import org.openjdk.jmh.annotations.Mode;
import org.openjdk.jmh.annotations.OutputTimeUnit;
import org.openjdk.jmh.annotations.Param;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.Setup;
import org.openjdk.jmh.annotations.State;
import org.openjdk.jmh.annotations.Warmup;
import org.openjdk.jmh.runner.Runner;
import org.openjdk.jmh.runner.options.OptionsBuilder;
/**
* Compare array clone with equivalent System.arraycopy-based routines
*/
@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@Warmup(iterations = 2, time = 3, timeUnit = TimeUnit.SECONDS)
@Measurement(iterations = 15, time = 1, timeUnit = TimeUnit.SECONDS)
@Fork(1)
@State(Scope.Benchmark)
public class ArrayClone {
@Param({"0", "10", "100", "1000"})
int size;
private byte[] bytes;
private int[] ints;
@Setup
public void setup() {
bytes = new byte[size];
ints = new int[size];
ThreadLocalRandom.current().nextBytes(bytes);
for (int i = 0; i < ints.length; i++) {
ints[i] = ThreadLocalRandom.current().nextInt();
}
}
@Benchmark
public byte[] byteClone() {
return bytes.clone();
}
@Benchmark
public byte[] byteArraycopy() {
byte[] copy = new byte[bytes.length];
System.arraycopy(bytes, 0, copy, 0, bytes.length);
return copy;
}
@Benchmark
public int[] intClone() {
return ints.clone();
}
@Benchmark
public int[] intArraycopy() {
int[] copy = new int[ints.length];
System.arraycopy(ints, 0, copy, 0, ints.length);
return copy;
}
}