Multiprocessor communication micro chip

I was thinking of one idea where in case of single processor not able to handle all the software load i want to create multi processor architecture of micro chip dspic30f family as proof of concept. Is it feasible? I am sorry if I am vague.

Of course it is.... IMAC and PC's have done it for years..

In my old amiga there were decicated processors for Video, Sound and IO etc.. to take the burden from the main processor...

PC's always use graphics processors and BIOS processors... Most 16 bit plus processors have DMA control to let other processors do other tasks..

maybe worth to note https://ww1.microchip.com/downloads/en/DeviceDoc/70172A.pdf

But what methodology should I follow to communicate between the controllers. Can I think of some shared memory between the controllers?

Like I said.. Most 16bit + processors have DMA controllers for just that purpose.. ( Direct Memory Access )