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

    This parameter allows the swapper an alternative mechanism before
    actually performing swaps.

    On VAX systems, SWPOUTPGCNT defines the minimum number of pages
    to which the swapper should attempt to reduce a process before
    swapping it out. The pages taken from the process are placed into
    the free-page list.

    On Alpha systems, SWPOUTPGCNT defines the minimum number of
    pagelets to which the swapper should attempt to reduce a process
    before swapping it out. The pagelets taken from the process are
    placed into the free-page list.

    SWPOUTPGCNT has the DYNAMIC attribute. On VAX systems,
    SWPOUTPGCNT also has the AUTOGEN attribute.