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

       /WSEXTENT=n

    Defines for the batch job a working set extent, the maximum
    amount of physical memory that the job can use. The job uses
    the maximum amount of physical memory only when the system has
    excess free pages. If the queue on which the job executes has a
    nonzero working set extent, the smaller of the specified job and
    queue values is used. If the queue on which the job executes has
    a working set extent of 0, the smaller of the specified job 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 OpenVMS systems round
    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 the value 0 or NONE,
    the specified queue or UAF value is used. Working set extent
    values must range between the numbers specified by the system
    parameters PQL_MWSEXTENT and WSMAX.