eclipse collections megamorphic calls benchmark

ListOfBenchmark.java

package io.github.isopov.jmh;

import org.eclipse.collections.api.list.ImmutableList;
import org.eclipse.collections.impl.factory.Lists;
import org.openjdk.jmh.annotations.*;
import org.openjdk.jmh.runner.Runner;
import org.openjdk.jmh.runner.RunnerException;
import org.openjdk.jmh.runner.options.Options;
import org.openjdk.jmh.runner.options.OptionsBuilder;

import java.util.List;
import java.util.concurrent.TimeUnit;

//Result is
//Benchmark                    Mode  Cnt   Score   Error  Units
//ListOfBenchmark.eclipseSize  avgt   15  64.236 ± 0.827  ns/op
//ListOfBenchmark.jdkSize      avgt   15   8.536 ± 0.068  ns/op

@State(Scope.Thread)
@BenchmarkMode(Mode.AverageTime)
@Fork(3)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@Warmup(iterations = 3, time = 1)
@Measurement(iterations = 5, time = 1)
public class ListOfBenchmark {


    private ImmutableList<ImmutableList<String>> eclipse = Lists.immutable.of(
            Lists.immutable.of("a"),
            Lists.immutable.of("a", "b"),
            Lists.immutable.of("a", "b", "c"),
            Lists.immutable.of("a", "b", "c", "d"),
            Lists.immutable.of("a", "b", "c", "d", "e"),
            Lists.immutable.of("a", "b", "c", "d", "e", "f"),
            Lists.immutable.of("a", "b", "c", "d", "e", "f", "g")
    );
    private List<List<String>> jdk = List.of(
            List.of("a"),
            List.of("a", "b"),
            List.of("a", "b", "c"),
            List.of("a", "b", "c", "d"),
            List.of("a", "b", "c", "d", "e"),
            List.of("a", "b", "c", "d", "e", "f"),
            List.of("a", "b", "c", "d", "e", "f", "g")
    );

    @Benchmark
    public int eclipseSize() {
        int result = 0;
        for (var l : eclipse) {
            result += l.size();
        }
        return result;
    }

    @Benchmark
    public int jdkSize() {
        int result = 0;
        for (var l : jdk) {
            result += l.size();
        }
        return result;
    }

    public static void main(String[] args) throws RunnerException {
        Options opt = new OptionsBuilder()
                .include(".*" + ListOfBenchmark.class.getSimpleName() + ".*")
                .build();

        new Runner(opt).run();
    }
}