VAX MP running OpenVMS in 32-processor configuration, theoretical limit for
Host machine was Amazon EC2 node with two Xeon sockets, each with 8 core Xeon chip, each core hyperthreaded, for a total of 32 host simultaneous execution units.
Note that MONITOR has apparent bug limiting collection of CPU usage data to first 31 processors only.
OpenVMS itself is able to load all of the systemís processors, as evidenced by SHOW SYSTEM
screen above and MONITOR STATES screen below.