Re: FAST BOOT OF SIMH VAX Emulator

From: David Froble (davef_at_tsoft-inc.com)
Date: 11/17/04 

Date: Tue, 16 Nov 2004 19:35:32 -0500

Vadim Model wrote:

> shevchenko@ikp.tu-darmstadt.de (Sheva) wrote in message news:<adeef81b.0411150320.8b1cf2b@posting.google.com>...
>
>>Is there a way to freeze this state, and reactivate it later?
>>
>
> In principle, yes, the emulator could do this for you (when
> implemented). But do you really need that frozen state? Next time you
> wake-up your system it will start from the same state. Including the
> system time, so that you need to correct it manually. And where is
> guarantee that certain application could stand such a temporal "jump"?
>
> Actually I doubt that such tricks could be correctly implemented
> without appropriate support from VMS. And after all, booting takes VMS
> much less then a minute. Provided that you have fast enough CPU, of
> course. As far as shutdown is concerned you can just kill the
> emulator. I have never experienced any problems with such a fast
> "shutdown".
>
> Regards,
> Vadim
>

If you're not really doing any work, then sure, you can do that.

If you have applications running, with complex transactions being posted,
updating multiple files, and you kill it in the middle of a transaction then you
have bad data.

I'm guessing most people are running SIMH just to see VMS running on a windoz
box, and aren't doing anything serious.

Dave 

-- 
David Froble                       Tel: 724-529-0450
Dave Froble Enterprises, Inc.      Fax: 724-529-0596
DFE Ultralights, Inc.              E-Mail: davef@tsoft-inc.com
170 Grimplin Road
Vanderbilt, PA  15486

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