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wtf is jmh?

lenguyenthanh/jmh — explained in plain English

Analysis updated 2026-07-18 · repo last pushed 2023-01-12

Audience · developerComplexity · 3/5DormantSetup · moderate

TL;DR

JMH is the standard tool Java developers use to measure exactly how fast their code runs, avoiding the tricks the Java runtime plays on naive timing.

Mindmap

mindmap
  root((repo))
    What it does
      Measures code speed
      Warms up code
      Runs statistically sound
    Tech stack
      Java
      Maven
      Kotlin
      Scala
    Use cases
      Compare function speed
      Test app performance
      Benchmark libraries
      Validate optimizations
    Audience
      Java developers
      Library maintainers
      Performance engineers
      JVM language users

Code map

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filefunction / class

Why would anyone build with this?

REASON 1

Compare two implementations of a function to see which one actually runs faster.

REASON 2

Benchmark a library's performance before publishing a new release.

REASON 3

Measure how your application performs under different JVM conditions.

REASON 4

Validate that a code optimization actually improved speed rather than just looking faster.

What's in the stack?

JavaMavenJVMKotlinScala

How it stacks up

lenguyenthanh/jmh0verflowme/alarm-clock0verflowme/seclists
Language—CSS—
Last pushed2023-01-122022-10-032020-05-03
MaintenanceDormantDormantDormant
Setup difficultymoderateeasyeasy
Complexity3/52/51/5
Audiencedevelopervibe coderops devops

Figures from each repo's GitHub metadata at analysis time.

How do you spin it up?

Difficulty · moderate Time to first run · 30min

Best used in a separate Maven project with command-line execution for accurate results.

Open source and accepts community contributions via pull requests, check the repo for exact license terms.

Yoink these prompts

Prompt 1
Help me set up a separate Maven project with JMH to benchmark my Java function.
Prompt 2
Write a JMH benchmark that compares two different implementations of the same method.
Prompt 3
Explain how JMH's warm-up phase avoids misleading results from JVM optimizations.
Prompt 4
Show me how to run a JMH benchmark from the command line and interpret its output.

Frequently asked questions

wtf is jmh?

JMH is the standard tool Java developers use to measure exactly how fast their code runs, avoiding the tricks the Java runtime plays on naive timing.

Is jmh actively maintained?

Dormant — no commits in 2+ years (last push 2023-01-12).

What license does jmh use?

Open source and accepts community contributions via pull requests, check the repo for exact license terms.

How hard is jmh to set up?

Setup difficulty is rated moderate, with roughly 30min to a first successful run.

Who is jmh for?

Mainly developer.

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