commensal-ejml is a commensal compiler for the EJML matrix math library. This is a pedagogical example, not a production-quality compiler; I've deliberately restricted its scope to one benchmark (the Kalman filter included with EJML).
To learn more about commensal compliation, see StreamJIT: A Commensal Compiler for High-Performance Stream Programming, published in OOPSLA 2014. (This compiler is not described in the paper, but was featured in the talk (slides).)
ant fetch; ant jar
ant run -Dimpl={simple,ops,commensal}
Running under ant or an IDE seems to inject noise into this benchmark,
so for best results, run with java directly.