111 lines
3.4 KiB
Java
111 lines
3.4 KiB
Java
/*
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* Copyright (c) 2018, Red Hat, Inc. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package org.openjdk.bench.java.util;
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import org.openjdk.jmh.annotations.Benchmark;
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import org.openjdk.jmh.annotations.BenchmarkMode;
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import org.openjdk.jmh.annotations.Fork;
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import org.openjdk.jmh.annotations.Measurement;
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import org.openjdk.jmh.annotations.Mode;
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import org.openjdk.jmh.annotations.OutputTimeUnit;
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import org.openjdk.jmh.annotations.Param;
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import org.openjdk.jmh.annotations.Scope;
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import org.openjdk.jmh.annotations.Setup;
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import org.openjdk.jmh.annotations.State;
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import org.openjdk.jmh.annotations.Warmup;
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import java.util.HashMap;
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import java.util.LinkedHashMap;
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import java.util.Map;
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import java.util.concurrent.ThreadLocalRandom;
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import java.util.concurrent.TimeUnit;
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import java.util.function.Supplier;
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import java.util.stream.IntStream;
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import static java.util.stream.Collectors.toMap;
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@BenchmarkMode(Mode.AverageTime)
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@OutputTimeUnit(TimeUnit.MILLISECONDS)
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@State(Scope.Thread)
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@Warmup(iterations = 4, time = 2)
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@Measurement(iterations = 4, time = 2)
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@Fork(value = 3)
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public class HashMapBench {
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private Supplier<Map<Integer, Integer>> mapSupplier;
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private Map<Integer, Integer> bigMapToAdd;
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@Param("1000000")
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private int size;
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@Param
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private MapType mapType;
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public enum MapType {
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HASH_MAP,
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LINKED_HASH_MAP,
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}
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@Setup
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public void setup() {
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switch (mapType) {
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case HASH_MAP:
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mapSupplier = () -> new HashMap<>();
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break;
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case LINKED_HASH_MAP:
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mapSupplier = () -> new LinkedHashMap<>();
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break;
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default:
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throw new AssertionError();
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}
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ThreadLocalRandom rnd = ThreadLocalRandom.current();
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this.bigMapToAdd = IntStream.range(0, size).boxed()
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.collect(toMap(i -> 7 + i * 128, i -> rnd.nextInt()));
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}
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@Benchmark
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public int putAllWithBigMapToNonEmptyMap() {
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Map<Integer, Integer> map = mapSupplier.get();
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map.put(-1, -1);
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map.putAll(bigMapToAdd);
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return map.size();
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}
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@Benchmark
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public int putAllWithBigMapToEmptyMap() {
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Map<Integer, Integer> map = mapSupplier.get();
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map.putAll(bigMapToAdd);
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return map.size();
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}
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@Benchmark
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public int put() {
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Map<Integer, Integer> map = mapSupplier.get();
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for (int k : bigMapToAdd.keySet()) {
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map.put(k, bigMapToAdd.get(k));
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}
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return map.size();
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}
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}
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