Running the JDK microbenchmarks using'make test TEST=micro:...", will run JMH with the default number of forks, 5. That is, it will fork and run all of the warmups and measurement iterations 5 times in succession.

It would be better for this job to use a lower fork value (such as 1) by default. This would be sufficient for quick performance verification tasks, and would reduce the default run duration significantly.