/sys$common/syshlp/helplib.hlb Sys Parameters, LCKMGR_MODE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    (Alpha only) The LCKMGR_MODE parameter controls usage of the
    Dedicated CPU Lock Manager. Setting LCKMGR_MODE to a number
    greater than zero (0) indicates the number of CPUs that must
    be active before the Dedicated CPU Lock Manager is turned on.

    The Dedicated CPU Lock Manager performs all locking operations
    on a single dedicated CPU. This can improve system performance
    on large SMP systems with high MP_Synch associated with the lock
    manager.

    For more information about usage of the Dedicated CPU Lock
    Manager, see the OpenVMS Performance Management.

    Specify one of the following:

    Value    Description

    0        Indicates the Dedicated CPU Lock Manager is off. (The
             default.)
    >0       Indicates the number of CPUs that must be active before
             the Dedicated CPU Lock Manager is turned on.

    LCKMGR_MODE is a DYNAMIC parameter.