How to time the different stages of maven execution

Question

I have a maven build that is extremely slow. I would like to know whether there is a way to profile maven execution in order to find out which are the most time-consuming steps.

Later I will want to compare these times between builds for older versions (which were faster), so they should be ideally in a format that can be compared/diffed/graphed.

Answer 1

This is the quickest possible way:

export MAVEN_OPTS="-Dorg.slf4j.simpleLogger.dateTimeFormat=HH:mm:ss,SSS \                    -Dorg.slf4j.simpleLogger.showDateTime=true"  mvn test 

Results in

MAVEN_OPTS="-Dorg.slf4j.simpleLogger.dateTimeFormat=HH:mm:ss,SSS -Dorg.slf4j.simpleLogger.showDateTime=true" mvn test 17:06:07,330 [INFO] Scanning for projects... 17:06:07,447 [INFO]  17:06:07,447 [INFO] ------------------------------------------------------------------------ 17:06:07,448 [INFO] Building bimble-server 0.0.1-SNAPSHOT 17:06:07,448 [INFO] ------------------------------------------------------------------------ 17:06:07,747 [INFO]  17:06:07,748 [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ bimble-server --- 

If you then add that environment variable to your shell's config file (like ~/.bashrc or ~/.profile) you will have those timings every time you use Maven.

Based on info from Stanley Hillner's blog: