If you need per-core number crunching performance you'd reach for Nx, similar to how you would do the crunching in Python. With OTP it's then (almost) trivially concurrent.
Compared to squeezing performance out of multiple cores with the JVM it's absurdly convenient and consumes way less RAM. I have two reasons for still working with the JVM, multiplatform desktop GUI and high quality PDF libraries that support rather low-level aspects of the standard that I need. It's kind of obvious why these things aren't readily available on the BEAM, though.
Compared to squeezing performance out of multiple cores with the JVM it's absurdly convenient and consumes way less RAM. I have two reasons for still working with the JVM, multiplatform desktop GUI and high quality PDF libraries that support rather low-level aspects of the standard that I need. It's kind of obvious why these things aren't readily available on the BEAM, though.