val create : ?local:int ‑> ?remote:(_ Rpc_parallel.Remote_executable.t * int) list ‑> ?cd:string ‑> redirect_stderr:[ `Dev_null | `File_append of string ] ‑> redirect_stdout:[ `Dev_null | `File_append of string ] ‑> unit ‑> tDefault is to create the same number of local workers as the cores in local machine. All spawned workers will their redirect stdout and stderr to the same file.