```
$ benchmark-driver -v --rbenv 'before --jit;after --jit' --repeat-count=4 --alternate --output=all benchmark.yml
before --jit: ruby 3.0.0dev (2020-12-22T05:16:39Z master 692af8e8) +JIT [x86_64-linux]
after --jit: ruby 3.0.0dev (2020-12-22T06:05:59Z master d2ca23fdbc) +JIT [x86_64-linux]
last_commit=MJIT is enabled whenever an MJIT header is used
Calculating -------------------------------------
                             before --jit           after --jit
Optcarrot 180 frames    86.61115328062763     91.49245232931852 fps
                        90.18653732453176     92.31139517827663
                        91.29817884736318     93.84437713805814
                        92.76118222412521     93.91929147901106
```