VMS Help AUTOGEN, When to Run AUTOGEN  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Compaq recommends that you run AUTOGEN in the following
    circumstances:

    o  During a new installation or upgrade.

    o  Whenever your work load changes significantly.

    o  When you add an optional (layered) software product. Certain
       layered products might require you to execute AUTOGEN to
       adjust parameter values and page and swap file sizes. (For
       information about using AUTOGEN to modify page and swap files,
       refer to the chapter on managing page, swap, and dump files
       in the OpenVMS System Manager's Manual.) Refer to specific
       product documentation for installation requirements.

    o  When you install images with the /SHARED attribute. The
       GBLSECTIONS and GBLPAGES parameters might need to be increased
       to accommodate additional use of global pages and global
       sections.

    o  During normal operation, as part of a batch-oriented
       command procedure that runs AUTOGEN on a regular basis and
       automatically sends a report to an appropriate Mail account.
       The recommended procedure is described in the chapter on
       managing system parameters in the OpenVMS System Manager's
       Manual.

    After a new operating system installation or upgrade, examine the
    results of calculations that AUTOGEN made to determine whether
    AUTOGEN has set system parameter values that are appropriate for
    your workload requirements.