[phenixbb] Specifying the number of processors to run phenix with

Hi- anyone know how to specify the number of processors to run phenix under in linux? Or how to tell what the default is? I'm running linux (fedora) with 4 processors and can't tell whether phenix is using all of them or not. I do the refinement with .csh files and tried doing "myfile.csh --nproc=4". The file ran but no faster- I can't tell if it is using 4 by default or if that's the incorrect command to specify the use of 4 processors. Thanks for your help! -Sam