VMS Help Sys Parameters, BALSETCNT  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    BALSETCNT sets the number of balance set slots in the system page
    table. Each memory-resident working set requires one balance set
    slot.

    You can monitor the active system with the DCL command SHOW
    MEMORY or the MONITOR PROCESSES command of the Monitor utility to
    determine the actual maximum number of working sets in memory. If
    this number is significantly lower than the value of BALSETCNT,
    this parameter value may be lowered. If all balance set slots are
    being used, raise the value of BALSETCNT.

    Never set BALSETCNT to a value higher than 2 less than
    MAXPROCESSCNT. If physical memory is a significant system
    constraint, consider lowering this value even further. However,
    if your system runs with a number of processes nearly equal to
    MAXPROCESSCNT, lowering BALSETCNT will force swapping to occur,
    which can affect system performance. Note that virtual balance
    slots (VBS) can affect the values of BALSETCNT and MAXPROCESSCNT.

    BALSETCNT is an AUTOGEN, GEN, and MAJOR parameter.