AUTOGEN is a command procedure supplied by Compaq/HP that attempts to ensure that SYSGEN parameters fall within HP's(formerly Compaq) recommended limits. AUTOGEN performs the valuable task of propagating changes to interrelated parameters. When you change a parameter related to some other parameter AUTOGEN analyzes your modifications and adjusts related parameters.

Set the system parameters by specifying them in your SYS$SYSTEM:MODPARAMS.DAT file and invoke AUTOGEN in SYS$UPDATE. Some parameters take effect immediately, while others take effect only after you reboot the system.

Example:

$ SET DEFAULT SYS$SYSTEM
$ CREATE MODPARAMS.DAT
MIN_GBLPAGES = 50000
MIN_GBLPAGFIL = 40000
MIN_GBLSECTIONS = 100
MIN_VIRTUALPAGECNT = 600000
MIN_WSMAX = 4096
<CTRL-Z>
$ SET DEFAULT SYS$UPDATE
$ @AUTOGEN GETDATA REBOOT NOFEEDBACK

In this example, the DCL command SET DEFAULT sets the default to the directory specified by the logical name SYS$SYSTEM. SYS$SYSTEM contains files processed by AUTOGEN.

The DCL command CREATE creates the MODPARAMS.DAT file and inserts each separate line following the command as a record of the new file. Pressing <CTRL-Z> signals the end of the input.

The DCL command SET DEFAULT sets the default to the directory specified by the logical name SYS$UPDATE. Invoking AUTOGEN from the system manager's account ensures that you have the required privileges. GETDATA is an AUTOGEN start-phase which collects all data required by the AUTOGEN system generation phases. REBOOT is the AUTOGEN end-phase that reboots the system to allow some parameters to take effect. NOFEEDBACK is an execution type which tells AUTOGEN not to use feedback information gathered from the system.

For more information on AUTOGEN, refer to the OpenVMS System Management Utilities Reference Manual.