I think the OP needs to read up on loosely couple multiprocessing vs tightly coupled multiprocessing and homogenous vs heterogenous computing systems.
Tightly coupled means shared memory, shared I/O busses and complex processor signalling of the type you'd get in a highly parallel clustered computer with a shared workload. In very highly parallel clustering the workload has to be broken into small chunks that can be run in parallel then the results are amalgamated to make a single results set as output. It also needs a very specialised OS and job scheduler to spread the work evenly across all of the engines.
Loosely coupled means shared disks, shared tape drives, shared networking but discrete encapsulated workloads (like a DRDA SQL request coming in from a device in the network) probably with a workload scheduler to ensure that one machine isn't overloaded while another is dormant. That's the sort of mainframe I work with (albeit that each machine is a "logical partition" on the same hardware they are physically separate for the purposes of this discussion).
Homogenous means all systems are identical, they run the same OS on the same processor architecture. Connecting two identical X86_64 laptops to the same disk array doesn't give you a single image computer with the power of two laptops (because things like screens and keyboards aren't easy to share). It may be homogenous but it would be a cumbersome and ludicrous beast.
Heterogenous means each system can be entirely different from every other (like X86 vs X86_64 vs ARM and running Windows vs Linux vs OSX and big-endian vs little-endian). Running that in a loosely coupled configuration generally buys you nothing. It's not much different to my X86_64 laptop running a 3270 emulator connected to a remote IBM zSeries mainframe. Or a bank ATM connected to their mainframe. What can you possibly offload to the second processor without introducing an emulation layer or only sending it trivial tasks (like reading a chip'n'pin (EMV card), digit entry on PIN pad entry & currency note counting)?
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