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8225339: Optimize HashMap.keySet()/HashMap.values()/HashSet toArray() methods

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Reviewed-by: rriggs, redestad, smarks
This commit is contained in:
Tagir F. Valeev 2019-06-14 05:02:58 +00:00
parent 51cf24fcc0
commit 822c02437a
5 changed files with 387 additions and 3 deletions
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95
test/micro/org/openjdk/bench/java/util/HashMapToArray.java Normal file
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/*
* Copyright (c) 2019, 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 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 java.util.Arrays;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;
@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@Warmup(iterations = 5, time = 500, timeUnit = TimeUnit.MILLISECONDS)
@Measurement(iterations = 10, time = 500, timeUnit = TimeUnit.MILLISECONDS)
@Fork(3)
@State(Scope.Thread)
public class HashMapToArray {
@Param({"0", "1", "10", "1000", "100000"})
public int size;
@Param({"HashMap", "LinkedHashMap"})
public String mapType;
private Map<Integer, Integer> map;
@Setup
public void setup() {
switch (mapType) {
case "HashMap":
map = new HashMap<>();
break;
case "LinkedHashMap":
map = new LinkedHashMap<>();
break;
default:
throw new IllegalStateException();
}
for (int i = 0; i < size; i++) {
map.put(i, i * i);
}
}
@Benchmark
public Object[] testKeySetToArray() {
return map.keySet().toArray();
}
@Benchmark
public Object[] testKeySetToArrayTyped() {
return map.keySet().toArray(new Integer[0]);
}
@Benchmark
public Object[] testValuesToArray() {
return map.values().toArray();
}
@Benchmark
public Object[] testValuesToArrayTyped() {
return map.values().toArray(new Integer[0]);
}
}