VMS Help SET, ENTRY, Qualifiers, /WSDEFAULT  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /WSDEFAULT=n

    Defines, for a batch job, a working set default, which is the
    default number of physical pages that the job can use.

    If the queue on which the job executes has a nonzero default
    working set, the smaller of the specified job and queue values
    is used. If the queue on which the job executes has a working set
    default of zero, the smaller of the specified job value and the
    value established in the user authorization file (UAF) is used.

    Specify the value of n as a number of 512-byte pagelets on
    Alpha or 512-byte pages on VAX. Note that the operating system
    rounds up this value to the nearest CPU-specific page so that
    the actual amount of physical memory allowed may be larger than
    the specified amount on Alpha. If you specify zero or NONE, the
    specified queue or UAF value is used. Working set default values
    must range between the numbers specified by the system parameters
    PQL_MWSDEFAULT and WSMAX.