PFRATH specifies the page fault rate above which the limit of
    a working set is automatically increased. The unit of measure
    is the number of faults per 10 seconds of processor time. At a
    setting of 120, for example, the system automatically increases
    the limit of a working set if it is faulting more than 120 pages
    per 10 seconds. Decreasing the value of this parameter tends to
    increase the limits of the working sets, while increasing its
    value tends to decrease their limits.

    On Alpha and Integrity servers, the default value is 8 page
    faults every 10 seconds.

    PFRATH has the DYNAMIC and MAJOR attributes. On Alpha and
    Integrity servers, PFRATH also is an AUTOGEN-altered parameter.