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| 1 | +package benchmark; |
| 2 | + |
| 3 | +import com.google.common.collect.ImmutableMap; |
| 4 | +import org.openjdk.jmh.annotations.Benchmark; |
| 5 | +import org.openjdk.jmh.annotations.BenchmarkMode; |
| 6 | +import org.openjdk.jmh.annotations.Fork; |
| 7 | +import org.openjdk.jmh.annotations.Level; |
| 8 | +import org.openjdk.jmh.annotations.Measurement; |
| 9 | +import org.openjdk.jmh.annotations.Mode; |
| 10 | +import org.openjdk.jmh.annotations.Scope; |
| 11 | +import org.openjdk.jmh.annotations.Setup; |
| 12 | +import org.openjdk.jmh.annotations.State; |
| 13 | +import org.openjdk.jmh.annotations.Warmup; |
| 14 | +import org.openjdk.jmh.infra.Blackhole; |
| 15 | +import org.openjdk.jmh.runner.Runner; |
| 16 | +import org.openjdk.jmh.runner.options.Options; |
| 17 | +import org.openjdk.jmh.runner.options.OptionsBuilder; |
| 18 | + |
| 19 | +import java.util.HashMap; |
| 20 | +import java.util.LinkedHashMap; |
| 21 | +import java.util.Map; |
| 22 | +import java.util.Random; |
| 23 | + |
| 24 | +@State(Scope.Benchmark) |
| 25 | +@Warmup(iterations = 2, time = 5) |
| 26 | +@Measurement(iterations = 3, batchSize = 1000) |
| 27 | +@Fork(3) |
| 28 | +public class MapBenchmark { |
| 29 | + |
| 30 | + int numberEntries = 30; |
| 31 | + |
| 32 | + Map<String, Integer> hashMap; |
| 33 | + Map<String, Integer> linkedHashMap; |
| 34 | + Map<String, Integer> immutableMap; |
| 35 | + |
| 36 | + Random random; |
| 37 | + |
| 38 | + @Setup(Level.Trial) |
| 39 | + public void setUp() { |
| 40 | + random = new Random(); |
| 41 | + linkedHashMap = new LinkedHashMap<>(); |
| 42 | + for (int i = 0; i < numberEntries; i++) { |
| 43 | + linkedHashMap.put("string" + i, i); |
| 44 | + } |
| 45 | + hashMap = new HashMap<>(); |
| 46 | + for (int i = 0; i < numberEntries; i++) { |
| 47 | + hashMap.put("string" + i, i); |
| 48 | + } |
| 49 | + ImmutableMap.Builder<String, Integer> builder = ImmutableMap.builder(); |
| 50 | + for (int i = 0; i < numberEntries; i++) { |
| 51 | + builder.put("string" + i, i); |
| 52 | + } |
| 53 | + immutableMap = builder.build(); |
| 54 | + } |
| 55 | + |
| 56 | + @Benchmark |
| 57 | + @BenchmarkMode(Mode.Throughput) |
| 58 | + public void benchmarkLinkedHashMap(Blackhole blackhole) { |
| 59 | + mapGet(blackhole, linkedHashMap); |
| 60 | + } |
| 61 | + @Benchmark |
| 62 | + @BenchmarkMode(Mode.Throughput) |
| 63 | + public void benchmarkHashMap(Blackhole blackhole) { |
| 64 | + mapGet(blackhole, hashMap); |
| 65 | + } |
| 66 | + |
| 67 | + @Benchmark |
| 68 | + @BenchmarkMode(Mode.Throughput) |
| 69 | + public void benchmarkImmutableMap(Blackhole blackhole) { |
| 70 | + mapGet(blackhole, immutableMap); |
| 71 | + } |
| 72 | + |
| 73 | + private void mapGet(Blackhole blackhole, Map<String, Integer> mapp) { |
| 74 | + int index = rand(0, numberEntries); |
| 75 | + blackhole.consume(mapp.get("string" + index)); |
| 76 | + } |
| 77 | + |
| 78 | + private int rand(int loInc, int hiExc) { |
| 79 | + return random.nextInt(hiExc - loInc) + loInc; |
| 80 | + } |
| 81 | + |
| 82 | + public static void main(String[] args) throws Exception { |
| 83 | + Options opt = new OptionsBuilder() |
| 84 | + .include("benchmark.MapBenchmark") |
| 85 | + .build(); |
| 86 | + |
| 87 | + new Runner(opt).run(); |
| 88 | + } |
| 89 | +} |
| 90 | + |
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