andrebrait

#!/usr/bin/python

import urllib2
import re
import ssl
import sys

# # find generic mirrors
mirrors = urllib2.urlopen('http://www.debian.org/mirror/list')
https = []

andrebrait

package com.avenuecode.snippet;

import org.openjdk.jmh.annotations.Benchmark;

public class MyBenchmark {

    @Benchmark
    public void testMethod() {
        // This is a demo/sample template for building your JMH benchmarks. Edit as needed.
        // Put your benchmark code here.

andrebrait

mvn clean install

andrebrait

java -jar target/benchmarks.jar

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

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

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

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

    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 sum = 3;
    return sum;
}