BAEL-6725 - Performance Comparison Between Different Java String Concatenation Methods (#14458)
This commit is contained in:
Manfred
GitHub
parent
9b74111078
commit
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package com.baeldung.performance;
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import java.util.List;
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import java.util.concurrent.TimeUnit;
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import java.util.stream.Collectors;
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import org.openjdk.jmh.annotations.*;
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import org.openjdk.jmh.infra.Blackhole;
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import org.openjdk.jmh.runner.Runner;
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import org.openjdk.jmh.runner.options.Options;
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import org.openjdk.jmh.runner.options.OptionsBuilder;
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@State(Scope.Benchmark)
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@BenchmarkMode(Mode.AverageTime)
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@Warmup(iterations = 1, time = 2, timeUnit = TimeUnit.SECONDS)
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@Measurement(iterations = 3, time = 1, timeUnit = TimeUnit.SECONDS)
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@OutputTimeUnit(TimeUnit.MICROSECONDS)
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@Fork(value = 1)
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public class BatchConcatBenchmark {
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private static final String TOKEN = "string";
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private static final String[] DATA_100 = prepareData(100);
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private static final String[] DATA_1000 = prepareData(1000);
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private static final String[] DATA_10000 = prepareData(10000);
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private static final String FORMAT_STR_100 = getFormatStr(100);
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private static final String FORMAT_STR_1000 = getFormatStr(1000);
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private static final String FORMAT_STR_10000 = getFormatStr(10000);
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private static String[] prepareData(int size) {
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String[] data = new String[size];
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for (int n=0;n<size;n++) data[n] = TOKEN;
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return data;
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}
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private static String getFormatStr(int iterations) {
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StringBuilder builder = new StringBuilder();
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for (int n=0;n<iterations;n++) builder.append("%s");
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return builder.toString();
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}
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@State(Scope.Thread)
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public static class StrState {
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public String token = TOKEN;
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}
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@Benchmark
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public static void concatByPlusBy100(StrState strState, Blackhole blackhole) {
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String concatString = strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token+ strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token;
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blackhole.consume(concatString);
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}
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@Benchmark
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public static void concatByPlusBy1000(StrState strState, Blackhole blackhole) {
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String concatString = strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token+ strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token +
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strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token+ strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token +
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strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token+ strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token +
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strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token+ strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token +
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strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token+ strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token +
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strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token+ strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token +
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strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token+ strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token +
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strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token+ strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token +
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strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token+ strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token + strState.token;
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blackhole.consume(concatString);
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}
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@Benchmark
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public static void concatByJoinBy100(Blackhole blackhole) {
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concatByJoin(DATA_100, blackhole);
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}
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@Benchmark
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public static void concatByJoinBy1000(Blackhole blackhole) {
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concatByJoin(DATA_1000, blackhole);
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}
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@Benchmark
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public static void concatByJoinBy10000(Blackhole blackhole) {
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concatByJoin(DATA_10000, blackhole);
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}
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public static void concatByJoin(String[] data, Blackhole blackhole) {
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String concatString = String.join("", data);
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blackhole.consume(concatString);
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}
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@Benchmark
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public static void concatByFormatBy100(Blackhole blackhole) {
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concatByFormat(FORMAT_STR_100, DATA_100, blackhole);
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}
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@Benchmark
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public static void concatByFormatBy1000(Blackhole blackhole) {
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concatByFormat(FORMAT_STR_1000, DATA_1000, blackhole);
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}
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@Benchmark
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public static void concatByFormatBy10000(Blackhole blackhole) {
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concatByFormat(FORMAT_STR_10000, DATA_10000, blackhole);
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}
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public static void concatByFormat(String formatStr, String[] data, Blackhole blackhole) {
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String concatString = String.format(formatStr, data);
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blackhole.consume(concatString);
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}
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@Benchmark
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public static void concatByStreamBy100(Blackhole blackhole) {
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concatByStream(DATA_100, blackhole);
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}
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@Benchmark
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public static void concatByStreamBy1000(Blackhole blackhole) {
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concatByStream(DATA_1000, blackhole);
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}
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@Benchmark
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public static void concatByStreamBy10000(Blackhole blackhole) {
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concatByStream(DATA_10000, blackhole);
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}
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public static void concatByStream(String[] data, Blackhole blackhole) {
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String concatString = "";
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List<String> strList = List.of(data);
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concatString = strList.stream().collect(Collectors.joining(""));
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blackhole.consume(concatString);
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}
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public static void main(String[] args) throws Exception {
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Options options = new OptionsBuilder()
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.include(BatchConcatBenchmark.class.getSimpleName()).threads(1)
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.shouldFailOnError(true)
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.shouldDoGC(true)
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.jvmArgs("-server").build();
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new Runner(options).run();
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}
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}
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@ -0,0 +1,211 @@
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package com.baeldung.performance;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.StringJoiner;
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import java.util.concurrent.TimeUnit;
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import java.util.stream.Collectors;
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import org.openjdk.jmh.annotations.*;
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import org.openjdk.jmh.infra.Blackhole;
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import org.openjdk.jmh.runner.Runner;
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import org.openjdk.jmh.runner.options.Options;
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import org.openjdk.jmh.runner.options.OptionsBuilder;
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||||||
|
@State(Scope.Benchmark)
|
||||||
|
@BenchmarkMode(Mode.AverageTime)
|
||||||
|
@Warmup(iterations = 1, time = 2, timeUnit = TimeUnit.SECONDS)
|
||||||
|
@Measurement(iterations = 3, time = 1, timeUnit = TimeUnit.SECONDS)
|
||||||
|
@OutputTimeUnit(TimeUnit.MICROSECONDS)
|
||||||
|
@Fork(value = 1)
|
||||||
|
public class LoopConcatBenchmark {
|
||||||
|
|
||||||
|
private static final String TOKEN = "string";
|
||||||
|
private static final int ITERATION_100 = 100;
|
||||||
|
private static final int ITERATION_1000 = 1000;
|
||||||
|
private static final int ITERATION_10000 = 10000;
|
||||||
|
|
||||||
|
@Benchmark
|
||||||
|
public static void concatByPlusBy100(Blackhole blackhole) {
|
||||||
|
concatByPlus(ITERATION_100, blackhole);
|
||||||
|
}
|
||||||
|
|
||||||
|
@Benchmark
|
||||||
|
public static void concatByPlusBy1000(Blackhole blackhole) {
|
||||||
|
concatByPlus(ITERATION_1000, blackhole);
|
||||||
|
}
|
||||||
|
|
||||||
|
@Benchmark
|
||||||
|
public static void concatByPlusBy10000(Blackhole blackhole) {
|
||||||
|
concatByPlus(ITERATION_10000, blackhole);
|
||||||
|
}
|
||||||
|
|
||||||
|
public static void concatByPlus(int iterations, Blackhole blackhole) {
|
||||||
|
String concatString = "";
|
||||||
|
for (int n=0;n<iterations;n++) concatString += TOKEN;
|
||||||
|
blackhole.consume(concatString);
|
||||||
|
}
|
||||||
|
|
||||||
|
@Benchmark
|
||||||
|
public static void concatByConcatBy100(Blackhole blackhole) {
|
||||||
|
concatByConcat(ITERATION_100, blackhole);
|
||||||
|
}
|
||||||
|
|
||||||
|
@Benchmark
|
||||||
|
public static void concatByConcatBy1000(Blackhole blackhole) {
|
||||||
|
concatByConcat(ITERATION_1000, blackhole);
|
||||||
|
}
|
||||||
|
|
||||||
|
@Benchmark
|
||||||
|
public static void concatByConcatBy10000(Blackhole blackhole) {
|
||||||
|
concatByConcat(ITERATION_10000, blackhole);
|
||||||
|
}
|
||||||
|
|
||||||
|
public static void concatByConcat(int iterations, Blackhole blackhole) {
|
||||||
|
String concatString = "";
|
||||||
|
for (int n=0;n<iterations;n++) concatString = concatString.concat(TOKEN);
|
||||||
|
blackhole.consume(concatString);
|
||||||
|
}
|
||||||
|
|
||||||
|
@Benchmark
|
||||||
|
public static void concatByJoinBy100(Blackhole blackhole) {
|
||||||
|
concatByJoin(ITERATION_100, blackhole);
|
||||||
|
}
|
||||||
|
|
||||||
|
@Benchmark
|
||||||
|
public static void concatByJoinBy1000(Blackhole blackhole) {
|
||||||
|
concatByJoin(ITERATION_1000, blackhole);
|
||||||
|
}
|
||||||
|
|
||||||
|
@Benchmark
|
||||||
|
public static void concatByJoinBy10000(Blackhole blackhole) {
|
||||||
|
concatByJoin(ITERATION_10000, blackhole);
|
||||||
|
}
|
||||||
|
|
||||||
|
public static void concatByJoin(int iterations, Blackhole blackhole) {
|
||||||
|
String concatString = "";
|
||||||
|
for (int n=0;n<iterations;n++) concatString = String.join("", concatString, TOKEN);
|
||||||
|
blackhole.consume(concatString);
|
||||||
|
}
|
||||||
|
|
||||||
|
@Benchmark
|
||||||
|
public static void concatByFormatBy100(Blackhole blackhole) {
|
||||||
|
concatByFormat(ITERATION_100, blackhole);
|
||||||
|
}
|
||||||
|
|
||||||
|
@Benchmark
|
||||||
|
public static void concatByFormatBy1000(Blackhole blackhole) {
|
||||||
|
concatByFormat(ITERATION_1000, blackhole);
|
||||||
|
}
|
||||||
|
|
||||||
|
@Benchmark
|
||||||
|
public static void concatByFormatBy10000(Blackhole blackhole) {
|
||||||
|
concatByFormat(ITERATION_10000, blackhole);
|
||||||
|
}
|
||||||
|
|
||||||
|
public static void concatByFormat(int iterations, Blackhole blackhole) {
|
||||||
|
String concatString = "";
|
||||||
|
for (int n=0;n<iterations;n++) concatString = String.format("%s%s", concatString, TOKEN);
|
||||||
|
blackhole.consume(concatString);
|
||||||
|
}
|
||||||
|
|
||||||
|
@Benchmark
|
||||||
|
public static void concatByStringJoinerBy100(Blackhole blackhole) {
|
||||||
|
concatByStringJoiner(ITERATION_100, blackhole);
|
||||||
|
}
|
||||||
|
|
||||||
|
@Benchmark
|
||||||
|
public static void concatByStringJoinerBy1000(Blackhole blackhole) {
|
||||||
|
concatByStringJoiner(ITERATION_1000, blackhole);
|
||||||
|
}
|
||||||
|
|
||||||
|
@Benchmark
|
||||||
|
public static void concatByStringJoinerBy10000(Blackhole blackhole) {
|
||||||
|
concatByStringJoiner(ITERATION_10000, blackhole);
|
||||||
|
}
|
||||||
|
|
||||||
|
public static void concatByStringJoiner(int iterations, Blackhole blackhole) {
|
||||||
|
StringJoiner concatBuf = new StringJoiner("");
|
||||||
|
for (int n=0; n<iterations; n++) concatBuf.add(TOKEN);
|
||||||
|
blackhole.consume(concatBuf);
|
||||||
|
}
|
||||||
|
|
||||||
|
@Benchmark
|
||||||
|
public static void concatByStringBufferBy100(Blackhole blackhole) {
|
||||||
|
concatByStringBuffer(ITERATION_100, blackhole);
|
||||||
|
}
|
||||||
|
|
||||||
|
@Benchmark
|
||||||
|
public static void concatByStringBufferBy1000(Blackhole blackhole) {
|
||||||
|
concatByStringBuffer(ITERATION_1000, blackhole);
|
||||||
|
}
|
||||||
|
|
||||||
|
@Benchmark
|
||||||
|
public static void concatByStringBufferBy10000(Blackhole blackhole) {
|
||||||
|
concatByStringBuffer(ITERATION_10000, blackhole);
|
||||||
|
}
|
||||||
|
|
||||||
|
public static void concatByStringBuffer(int iterations, Blackhole blackhole) {
|
||||||
|
StringBuffer concatBuf = new StringBuffer();
|
||||||
|
for (int n=0; n<iterations; n++) concatBuf.append(TOKEN);
|
||||||
|
blackhole.consume(concatBuf);
|
||||||
|
}
|
||||||
|
|
||||||
|
@Benchmark
|
||||||
|
public static void concatByStringBuilderBy100(Blackhole blackhole) {
|
||||||
|
concatByStringBuilder(ITERATION_100, blackhole);
|
||||||
|
}
|
||||||
|
|
||||||
|
@Benchmark
|
||||||
|
public static void concatByStringBuilderBy1000(Blackhole blackhole) {
|
||||||
|
concatByStringBuilder(ITERATION_1000, blackhole);
|
||||||
|
}
|
||||||
|
|
||||||
|
@Benchmark
|
||||||
|
public static void concatByStringBuilderBy10000(Blackhole blackhole) {
|
||||||
|
concatByStringBuilder(ITERATION_10000, blackhole);
|
||||||
|
}
|
||||||
|
|
||||||
|
public static void concatByStringBuilder(int iterations, Blackhole blackhole) {
|
||||||
|
StringBuilder concatBuf = new StringBuilder();
|
||||||
|
for (int n=0; n<iterations; n++) concatBuf.append(TOKEN);
|
||||||
|
blackhole.consume(concatBuf);
|
||||||
|
}
|
||||||
|
|
||||||
|
@Benchmark
|
||||||
|
public static void concatByStreamBy100(Blackhole blackhole) {
|
||||||
|
concatByStream(ITERATION_100, blackhole);
|
||||||
|
}
|
||||||
|
|
||||||
|
@Benchmark
|
||||||
|
public static void concatByStreamBy1000(Blackhole blackhole) {
|
||||||
|
concatByStream(ITERATION_1000, blackhole);
|
||||||
|
}
|
||||||
|
|
||||||
|
@Benchmark
|
||||||
|
public static void concatByStreamBy10000(Blackhole blackhole) {
|
||||||
|
concatByStream(ITERATION_10000, blackhole);
|
||||||
|
}
|
||||||
|
|
||||||
|
public static void concatByStream(int iterations, Blackhole blackhole) {
|
||||||
|
String concatString = "";
|
||||||
|
List<String> strList = new ArrayList<>();
|
||||||
|
strList.add(concatString);
|
||||||
|
strList.add(TOKEN);
|
||||||
|
for (int n=0; n<iterations; n++) {
|
||||||
|
concatString = strList.stream().collect(Collectors.joining(""));
|
||||||
|
strList.set(0, concatString);
|
||||||
|
}
|
||||||
|
blackhole.consume(concatString);
|
||||||
|
}
|
||||||
|
|
||||||
|
public static void main(String[] args) throws Exception {
|
||||||
|
Options options = new OptionsBuilder()
|
||||||
|
.include(LoopConcatBenchmark.class.getSimpleName()).threads(1)
|
||||||
|
.shouldFailOnError(true)
|
||||||
|
.shouldDoGC(true)
|
||||||
|
.jvmArgs("-server").build();
|
||||||
|
new Runner(options).run();
|
||||||
|
}
|
||||||
|
|
||||||
|
}
|
||||||
Loading…
Reference in New Issue