andrebrait

static double distance(double x1, double y1, double x2, double y2) {
    double dx = x2 - x1;
    double dy = y2 - y1;
    return Math.sqrt((dx * dx) + (dy * dy));
}

static double constant(double x1, double y1, double x2, double y2) {
    return 0.0d;
}

andrebrait

@Benchmark
public void testMethod(MyState state, Blackhole blackhole) {
    int sum1 = state.a + state.b;
    int sum2 = state.a + state.a + state.b + state.b;

    blackhole.consume(sum1);
    blackhole.consume(sum2);
}

andrebrait

@State(Scope.Thread)
public static class MyState {
    public int a = 1;
    public int b = 2;
}

@Benchmark 
public int testMethod(MyState state) {
    int sum = state.a + state.b;
    return sum;

andrebrait

@Benchmark
public int testMethod() {
    int sum = 3;
    return sum;
}

andrebrait

@Benchmark
public void testMethod(Blackhole blackhole) {
    int a = 1;
    int b = 2;
    int sum = a + b;
    blackhole.consume(sum);
}

andrebrait

@Benchmark
public int testMethod() {
    int a = 1;
    int b = 2;
    int sum = a + b;

    return sum;
}

andrebrait

@Benchmark
public void testMethod() {
    int a = 1;
    int b = 2;
    int sum = a + b;
}

andrebrait

REMEMBER: The numbers below are just data. To gain reusable insights, you need to follow up on
why the numbers are the way they are. Use profilers (see -prof, -lprof), design factorial
experiments, perform baseline and negative tests that provide experimental control, make sure
the benchmarking environment is safe on JVM/OS/HW level, ask for reviews from the domain experts.
Do not assume the numbers tell you what you want them to tell.

Benchmark                  (listSize)  Mode  Cnt  Score    Error  Units
MyBenchmark.atomicLong        1000000  avgt    5  0.026 ±  0.001   s/op
MyBenchmark.atomicLong       10000000  avgt    5  0.263 ±  0.003   s/op
MyBenchmark.atomicLong      100000000  avgt    5  2.504 ±  0.466   s/op

andrebrait

package com.avenuecode.snippet;

import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Fork;
import org.openjdk.jmh.annotations.Level;
import org.openjdk.jmh.annotations.Mode;
import org.openjdk.jmh.annotations.Param;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.Setup;

andrebrait

java -jar target/benchmarks.jar