Number parsing benchmark for https://www.spigotmc.org/threads/optimizing-number-parsing-from-string.242771/#post-2434870

MyBenchmark.java

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package net.darkseraphim;

import org.openjdk.jmh.annotations.*;
import org.openjdk.jmh.infra.Blackhole;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ThreadLocalRandom;
import java.util.concurrent.TimeUnit;
import java.util.stream.IntStream;

public class MyBenchmark {

    @State(Scope.Benchmark)
    public static class IntState {
        private List<String> strings = new ArrayList<String>() {{
            IntStream.range(0, SAMPLE_SIZE).forEach(i -> add(randomInt()));
        }};
    }

    @State(Scope.Benchmark)
    public static class FloatState {
        private List<String> strings = new ArrayList<String>() {{
            IntStream.range(0, SAMPLE_SIZE).forEach(i -> add(randomFloat()));
        }};
    }

    private static final int SAMPLE_SIZE = 1000;

    private static String randomInt() {
        return String.valueOf(ThreadLocalRandom.current().nextInt());
    }

    private static String randomFloat() {
         return String.valueOf(ThreadLocalRandom.current().nextFloat());
    }

    @Benchmark
    @BenchmarkMode(Mode.Throughput)
    @OutputTimeUnit(TimeUnit.SECONDS)
    public void jvm_parseInt(IntState state, Blackhole bh) {
        for (int i = 0; i < state.strings.size(); i++) {
            bh.consume(Integer.parseInt(state.strings.get(i)));
        }
    }

    @Benchmark
    @BenchmarkMode(Mode.Throughput)
    @OutputTimeUnit(TimeUnit.SECONDS)
    public void jvm_parseFloat(FloatState state, Blackhole bh) {
        for (int i = 0; i < state.strings.size(); i++) {
            bh.consume(Float.parseFloat(state.strings.get(i)));
        }
    }

    @Benchmark
    @BenchmarkMode(Mode.Throughput)
    @OutputTimeUnit(TimeUnit.SECONDS)
    public void fast_parseInt(IntState state, Blackhole bh) {
        for (int i = 0; i < state.strings.size(); i++) {
            bh.consume(FastParse.fastParseInt(state.strings.get(i)));
        }
    }

    @Benchmark
    @BenchmarkMode(Mode.Throughput)
    @OutputTimeUnit(TimeUnit.SECONDS)
    public void fast_parseFloat(FloatState state, Blackhole bh) {
        for (int i = 0; i < state.strings.size(); i++) {
            char[] chars = state.strings.get(i).toCharArray();
            bh.consume(FastParse.fastParseFloat(chars, 0, chars.length));
        }
    }


    @Benchmark
    @BenchmarkMode(Mode.Throughput)
    @OutputTimeUnit(TimeUnit.SECONDS)
    public void jn_parseInt(IntState state, Blackhole bh) {
        for (int i = 0; i < state.strings.size(); i++) {
            bh.consume(JNumberParser.getInteger(state.strings.get(i)));
        }
    }

    @Benchmark
    @BenchmarkMode(Mode.Throughput)
    @OutputTimeUnit(TimeUnit.SECONDS)
    public void jn_parseFloat(FloatState state, Blackhole bh) {
        for (int i = 0; i < state.strings.size(); i++) {
            bh.consume(JNumberParser.getDouble(state.strings.get(i)));
        }
    }
}