Jeff,

        If I create a command file that executes a program, then the command file
stays open until I exit the program and let the commands complete, granted
it's closed at that point.

Thanx,
        Jon

-----Original Message-----
From: HP-3000 Systems Discussion [mailto:[log in to unmask]]On
Behalf Of Jeff Kell
Sent: Friday, June 15, 2001 8:18 AM
To: [log in to unmask]
Subject: Re: UDC vs Command files


"Shahan, Ray" wrote:
>
> That same issue, logon time performance, is sometimes a thorn for
companies
> that require folks to log off at lunch break, and/or who run more than 1
> shift.
>
> > -----Original Message-----
> > From: John Clogg [SMTP:[log in to unmask]]
> > Sent: Thursday, June 14, 2001 1:58 PM
> > Subject:      Re: UDC vs Command files
> >
> > Donna, as usual gives an excellent answer...
> > > for the up-shifting challenged amongst us
> > Who might that be?
> >
> > Anyway, I want to add one point.  One of the supposedly "bad" things
about
> > UDCs is the overhead at logon time required to catalog all the UDCs
> > available to the user.  These days I doubt that is a significant issue
for
> > most shops, but for one with a not-too-fast server and users who log on
> > and
> > off frequently, it could be of interest.

One key is the *number* of UDCs that are cataloged.  Way back in the
classic days I presented a paper on System Configuration at either Orlando
or Anaheim (81 or 83?  don't have my proceedings in front of me).  In
those days, data segments were at a premium for larger shops, and it
turns out that each catalogued UDC took a data segment at logon time.
I had a discussion with Jeff Vance at a more recent HPWorld about this
because he didn't believe me :-)  But it was true, at least of classic
MPE.  I don't know the overhead of MPE/iX.

Command files are presumably opened then closed, you only have the
directory search to find the file.  UDCs stay opened (with the file
overhead associated with open files on MPE/iX - a new mapped VSM object?)

Command files are also easier to change on the fly.

Jeff Kell <[log in to unmask]>

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