The Free On-line Dictionary of Computing (30 December 2018):

cellular multiprocessing

    (CMP) The partitioning of
   processors into separate computing environments running
   different operating systems.

   The term cellular multiprocessing appears to have been coined
   by Unisys, who are developing a system where computers
   communicate as clustered machines through a high speed bus,
   rather than through communication protocols such as
   TCP/IP.

   The Unisys system is based on Intel processors, initially
   the Pentium II Xeon and moving on to the 64-bit Merced
   processors later in 1999.  It will be scalable from four up to
   32 processors, which can be clustered or partitioned in
   various ways.  For example a sixteen processor system could be
   configured as four Windows NT systems (each functioning as a
   four-processor symmetric multiprocessing system), or an
   8-way NT and 8-way Unix system.

   Supported operating systems will be Windows NT, SCO's
   Unixware 7.0, Unisys' SVR4 Unix and possibly the OS2200
   and MCP-AS mainframe operating systems (with the assistance
   of Unisys' own dedicated chipset).

   (http://marketplace.unisys.com/ent/cmp.html).

   (1998-09-09)