The Tesla profiler is a simple EventSpy implementation that gathers timing information. It collects the time it takes to execute each mojo and gathers them within the phase they run. This was originally written to find a particular hotspot and it not formatted particularly well and definitely needs improvement.
To profile your build you need to install the profiling extension your Maven/Tesla distribution. Find the latest version in Maven Central and install it in the ${M2_HOME}/lib/ext directory.
To active the profiling you need to enable the profile system property:
mvn clean install -Dmaven.profile
Here's an example of what the output will look like:
org.apache.maven:maven-core:3.1.2-SNAPSHOT
clean 176ms
org.apache.maven.plugins:maven-clean-plugin:2.5 (default-clean) 176ms
initialize 408ms
org.codehaus.mojo:buildnumber-maven-plugin:1.2 (create-noncanonicalrev) 349ms
org.codehaus.mojo:buildnumber-maven-plugin:1.2 (create-buildnumber) 59ms
generate-sources 408ms
org.codehaus.modello:modello-maven-plugin:1.8.1 (standard) 369ms
org.codehaus.modello:modello-maven-plugin:1.8.1 (standard) 28ms
org.codehaus.modello:modello-maven-plugin:1.8.1 (standard) 11ms
generate-resources 933ms
org.apache.maven.plugins:maven-remote-resources-plugin:1.4 (default) 932ms
process-resources 225ms
org.apache.maven.plugins:maven-resources-plugin:2.6 (default-resources) 224ms
compile 4s 522ms
org.apache.maven.plugins:maven-compiler-plugin:2.5.1 (default-compile) 4s 522ms
process-classes 6s 880ms
org.codehaus.mojo:animal-sniffer-maven-plugin:1.6 (check-java-1.5-compat) 5s 814ms
org.codehaus.plexus:plexus-component-metadata:1.5.5 (default) 946ms
org.sonatype.plugins:sisu-maven-plugin:1.1 (default) 120ms
process-test-resources 173ms
org.apache.maven.plugins:maven-resources-plugin:2.6 (default-testResources) 173ms
test-compile 818ms
org.apache.maven.plugins:maven-compiler-plugin:2.5.1 (default-testCompile) 818ms
process-test-classes 134ms
org.codehaus.plexus:plexus-component-metadata:1.5.5 (default) 110ms
org.sonatype.plugins:sisu-maven-plugin:1.1 (default) 23ms
test 11s 306ms
org.apache.maven.plugins:maven-surefire-plugin:2.12 (default-test) 11s 306ms
package 1s 371ms
org.apache.maven.plugins:maven-jar-plugin:2.4 (default-jar) 502ms
org.apache.maven.plugins:maven-site-plugin:3.3 (attach-descriptor) 869ms