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8292698: Improve performance of DataInputStream

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Reviewed-by: dfuchs
This commit is contained in:
Sergey Tsypanov 2022-10-17 04:41:12 +00:00 • committed by Jaikiran Pai
parent d3781ac8a3
commit 74a51ccc86
2 changed files with 84 additions and 27 deletions
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69
test/micro/org/openjdk/bench/java/io/DataInputStreamTest.java Normal file
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/*
* Copyright (c) 2020, 2022, Red Hat Inc. 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 micro.org.openjdk.bench.java.io;
import org.openjdk.jmh.annotations.*;
import org.openjdk.jmh.infra.Blackhole;
import java.io.ByteArrayInputStream;
import java.io.DataInputStream;
import java.util.concurrent.ThreadLocalRandom;
import java.util.concurrent.TimeUnit;
@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.MICROSECONDS)
@Fork(value = 4, warmups = 0)
@Measurement(iterations = 5, time = 1)
@Warmup(iterations = 2, time = 2)
@State(Scope.Benchmark)
public class DataInputStreamTest {
private final int size = 1024;
private ByteArrayInputStream bais;
@Setup(Level.Iteration)
public void setup() {
byte[] bytes = new byte[size];
ThreadLocalRandom.current().nextBytes(bytes);
bais = new ByteArrayInputStream(bytes);
}
@Benchmark
public void readChar(Blackhole bh) throws Exception {
bais.reset();
DataInputStream dis = new DataInputStream(bais);
for (int i = 0; i < size / 2; i++) {
bh.consume(dis.readChar());
}
}
@Benchmark
public void readInt(Blackhole bh) throws Exception {
bais.reset();
DataInputStream dis = new DataInputStream(bais);
for (int i = 0; i < size / 4; i++) {
bh.consume(dis.readInt());
}
}
}