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8196334: Optimize UUID#fromString

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Co-authored-by: Andriy Plokhotnyuk <plokhotnyuk@gmail.com>
Co-authored-by: Jon Chambers <jon.chambers@gmail.com>
Reviewed-by: igerasim, alanb
This commit is contained in:
Claes Redestad 2020-03-02 08:22:48 +01:00
parent 751de03704
commit ebadfaeb2e
3 changed files with 145 additions and 5 deletions
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75
test/micro/org/openjdk/bench/java/util/UUIDBench.java Normal file
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/*
* Copyright (c) 2020, 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.util;
import java.util.UUID;
import java.util.concurrent.TimeUnit;
import org.openjdk.jmh.annotations.*;
@State(Scope.Thread)
@OutputTimeUnit(TimeUnit.MICROSECONDS)
@Fork(value = 3)
@Warmup(iterations = 5, time = 1, timeUnit = TimeUnit.SECONDS)
@Measurement(iterations = 5, time = 2, timeUnit = TimeUnit.SECONDS)
public class UUIDBench {
@Param("20000")
private int size;
private UUID[] uuids;
private String[] uuidStrings;
private int index = 0;
@Setup
public void setup() {
uuids = new UUID[size];
uuidStrings = new String[size];
for (int i = 0; i < this.uuidStrings.length; i++) {
final UUID uuid = UUID.randomUUID();
this.uuids[i] = uuid;
this.uuidStrings[i] = uuid.toString();
}
}
@Setup(Level.Iteration)
public void setupIteration() {
index++;
if (index >= size) {
index = 0;
}
}
@Benchmark
public UUID fromString() {
return UUID.fromString(uuidStrings[index]);
}
@Benchmark
public String toString() {
return uuids[index].toString();
}
}