#jmh — Public Fediverse posts

Wednesday Links - Edition 2025-07-02
https://dev.to/0xkkocel/wednesday-links-edition-2025-07-02-4bmb
#java #jmh #spring #architecture

🚀 Call for Contributors – #JVM #Performance #Benchmarks

If you're interested in contributing to the #JVM #Performance #Benchmarks project - an initiative that gained significant traction in the #Java community through our recent #JDK17 and #JDK21 analyses - check out the repo:

🔗 https://github.com/ionutbalosin/jvm-performance-benchmarks

🧵 DM me or open a PR to get started

#Java #JVM #OpenJDK #GraalVM #JMH #Performance #OpenSource

Simple O(n^2) vs mildly optimised solution in #Java for #AdventOfCode day 1 part 2 using #jmh.

Day 2 part 2 was surprisingly tricky to find the edge cases and required unit tests to track them all down.

Code: https://github.com/chriswhocodes/aoc2024
Benchmark: https://github.com/chriswhocodes/aoc2024-benchmark

https://on.soundcloud.com/HXq9JBGAVB6taFLB9 #belpolitiek #jmh #Berckmans

Thanks for attending my deep dive session, and thanks for all feedback and questions. #Devoxx #JMH

Slides https://t.ly/POQnP and if you want to get really crazy with running some examples, you can clone the repository from https://github.com/Xceptance/jmh-training

And here is the full recording: https://youtu.be/u5XC2nriqpQ?si=SB_05NXM3oqJ7x6f

Feedback appreciated!

Hope to see you tomorrow!

For all #1brc fans, we will lay the basic foundation for that exercise, without elaborating on tuning, by seeing the magic of the JVM and hardware... because it will hit us when benchmarking too naively.
@Devoxx #jmh #1brc

How many joules does it take to execute a single Java method?

In my latest Growing Green Software blog post, I explore this question and show how we can use JoularJX to break down the energy consumption of a Java program to the method level.

https://medium.com/growing-green-software/measuring-java-energy-consumption-987654efdabb

#GreenSoftware #EnergyMeasurement #Java #JMH #JoularJX

"My code is faster than yours... let me prove it to you!" Challenge accepted, François Martin! 🚨

In this #BaselOne24 talk, you will learn about benchmarking with #JMH. JMH is a #Java harness for building, running, and analyzing nano/micro/milli/macro benchmarks written in Java and other languages targeting the hashtag#JVM.

Get your tickets at https://lnkd.in/ggjmzerN.

#communityrocks #softwaredevelopment #softwareengineering #BaselOne

Как замерять и повышать производительность Java-кода: личный пример с JMH

Привет, Хабр! Большинство команд разработки так или иначе вовлечены в гонку за производительностью. Если понимать этот показатель как скорость работы системы, то вся деятельность по прокачке производительности — это, по сути, анализ метрик и поиск инструментов, которые эту скорость могут повысить. Меня зовут Александр Певненко , я работаю в СберТехе, компании, которая разрабатывает ПО. Для большинства наших продуктов производительность — критичный фактор, поэтому анализ метрик и оптимизация кода — важная часть цикла разработки. Хочу поделиться личным опытом и мнением обо всём, что касается оптимизации и повышения скорости работы кода, а также нагрузочного тестирования как части этой работы. Тут представлены моя собственная практика использования набора библиотек JMH для нагрузочного тестирования и замеров производительности Java-кода. Всем, кому интересно, добро пожаловать под кат!

https://habr.com/ru/companies/sberbank/articles/814299/

#тестирование #jmh

@matari Most of your recorded time will actually have been spent on the System.out.println command. And self-made benchmark timers are notorious for giving bad data, so I recommend JMH instead.

You're right that String.format is slower than using the + operator, but a JMH benchmark comparison would show the difference to be much greater. (It would also show that String.format allocates a bunch more bytes to the heap.)

In summary: don't use String.format for simple concatenation.

#Java #JMH

Today I made the first release of #SonarQube #Java Energy Impact #Plugin. See https://github.com/aixigo/sonarqube-java-energyimpact-plugin/blob/main/CHANGELOG.md

Based on scientific research the usage of #ArrayList and #HashMap is discouraged due to higher #EnergyConsumption leading to higher #CarbonEmission|s. 5% #EnergySaving|s can be achieved.

Now I'm searching for ways to measure energy consumption in #Java Microbenchmark Harness (#JMH) to start working on the higher hanging fruits/recommendations of the paper: https://doi.org/10.1007/s10664-021-09950-y

#GreenCoding

https://www.gva.be/cnt/dmf20230908_95777642 Cafe Kamiel nog steeds gesloten #jmh #antwerpen #berchem

The curious C2 case of different training data and sticking to it forever: https://github.com/rschwietzke/jmh-C2-compile

I would appreciate a review, any feedback, and possibly an idea, if this is a bug, a feature, or just one of the "bad luck" cases.

Appreciated! #java #jvm #jit #jmh

Here are the slides of my first #DevoxxPL talk. I had to rush a little because I wanted to tell you so much in so little time. Thanks for attending. I hope you enjoyed it and you can take something home.

See you tomorrow for "Parallel Programming is Hard". 1430/230pm in Room 2!

https://training.xceptance.com/java/500-the-art-of-microbenchmarking-devoxx-pl-2023.html

#java #jvm #jmh

Join me today at 1430/230pm in Room 4B for "Microbenchmarking, the art of realizing one is wrong" #DevoxxPL

I promise code, funny numbers, some #JVM insides and insights, and car analogies.

#Java #JMH

How to write JMH microbenchmarks for asynchronous functions (tips and tricks). https://mail.openjdk.org/pipermail/loom-dev/2023-May/005509.html
By Sergey Kuksenko #Java #jmh

JMH 1.36 (github.com/openjdk/jmh) is released (JDK 8 is now minimum, GC profiler bugfix, perfasm profiler improvements): https://mail.openjdk.org/pipermail/jmh-dev/2022-November/003553.html
#noxp #Java #jmh

Significantly cleaner #JMH results with this improvement to compiler blackholes, allowing standard load optimisations to work: https://mail.openjdk.org/pipermail/hotspot-compiler-dev/2022-November/060233.html #HotSpot #performance #benchmark