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test/micro/org/openjdk/bench/java/lang/ArrayCopyAlignedLarge.java
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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; | ||
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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; | ||
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import java.util.concurrent.TimeUnit; | ||
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/** | ||
* Benchmark measuring aligned System.arraycopy. | ||
*/ | ||
@BenchmarkMode(Mode.AverageTime) | ||
@OutputTimeUnit(TimeUnit.NANOSECONDS) | ||
@State(Scope.Thread) | ||
@Warmup(iterations = 10, time = 1) | ||
@Measurement(iterations = 5, time = 1) | ||
@Fork(value = 3) | ||
public class ArrayCopyAlignedLarge { | ||
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@Param({"100000", "1000000", "2000000", "5000000", "10000000"}) | ||
int length; | ||
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int fromPos, toPos; | ||
byte[] fromByteArr, toByteArr; | ||
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@Setup | ||
public void setup() { | ||
// Both positions aligned | ||
fromPos = 0; | ||
toPos = 0; | ||
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fromByteArr = new byte[length]; | ||
toByteArr = new byte[length]; | ||
} | ||
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@Benchmark | ||
public void testByte() { | ||
System.arraycopy(fromByteArr, fromPos, toByteArr, toPos, length); | ||
} | ||
} |