Using multiple cores with Mac

Hello, my Mac has 4 cores. When I run the --nproc 4, I get an error. Is there a way to use multiple cores on a Mac?

Hello and thanks for reporting this.
I’m not sure we never really thoroughly tested PhyloPhlAn on a Mac, but it would be very helpful if you can prove more details, like the PhyloPhlAn version you’re using, the command lines you’re running, and the error message you got.

Many thanks,
Francesco