To start multiprocessing, use
It is not necessary to use initialize-multiprocessing when the LispWorks environment is already running. Note that, on Windows, Mac OS X, Linux, x86/x64 Solaris and FreeBSD, the LispWorks images shipped do start the programming environment. If you create an image which does not start the programming environment, by using the
argument to save-image, then multiprocessing can be started in this new image as described below.
LispWorks User Guide and Reference Manual - 21 Dec 2011