[Simh] Deathrow OpenVMS SIMH Node.. Hosted by OpenVMS?
Villy Madsen
Villy.Madsen at shaw.ca
Wed Mar 11 15:14:50 EDT 2009
Is that it simulated 18.9 VUPS ?? it must be, because I get about 7 VUPs on my ancient 1.5ghz P4 & about 14VUPS on a 2.8ghz celeron...
Villy
----- Original Message -----
From: "Hittner, David T (IT)" <david.hittner at ngc.com>
Date: Wednesday, March 11, 2009 12:00
Subject: Re: [Simh] Deathrow OpenVMS SIMH Node.. Hosted by OpenVMS?
To: Bill Korendyk <bill at korendyk.net>
Cc: simh at trailing-edge.com
> I'm not ruling out OpenVMS as a SIMH VAX platform. Far from it.
> Use it
> if you want to.
>
> Simulation of another CPU eats an astonishing number of host CPU
> cyclesto perform the simulation work.
>
> I'm trying to set your (and other's) expectation level, based on my
> simulation experiences. Context is important here - maybe it's
> because I
> already have some real VAXes, but I don't WANT another "smaller"
> MicroVAX in my cluster. I already have a physical MicroVAX
> 4000/VLC in
> my cluster, and to be frank, it's performance sucks at 5.8 VUPS,
> particularly when compared to my physical MicroVAX 4000-500 at
> 22 VUPS.
>
> When I ran a SIMH VAX on my Alpha PWS 500au (which runs at 155
> VUPS), I
> get 1.1 VUPS on the SIMH VAX. For comparison, when I ran the
> SIMH VAX on
> my 3.0 GHz PC, it simulated 1.89 VUPS.
>
> If you have newer iron like the multi-issue Alpha ESxx/GSxx
> servers (or
> even a DS10!!) just sitting around that you can run simulations
> on, go
> for it. If you are looking at _purchasing_ a low-cost platform
> for home
> use to run VAX software, I'm merely suggesting that you might
> want to
> take the cheaper path to Hobbyist VAX performance, which is a
> fast PC
> running SIMH VAX - or many times, just a used VAX.
>
> I'd be happy to look at your Alpha-based SIMH VAX VUPS numbers for
> comparison with mine; maybe my measuring and estimating sucks. :-))
>
> FWIW, my low-end HP Integrity rx2620 [at work] running OpenVMS
> clocks in
> at 533 VUPS. I've never tried running SIMH it, but I'm sure it
> would be
> much better than the Alpha (at 155 VUPS); but then again, just
> try to
> buy an rx2620 on Ebay ... $$$. The semi-affordable, semi-supported
> rx2600 is pretty reasonable on Ebay at $300-$2500, but is _much_
> slowerthan the rx2620.
>
> Dave
>
> > -----Original Message-----
>
> > From: Bill Korendyk [mailto:bill at korendyk.net]
> > Sent: Wednesday, March 11, 2009 12:14 PM
> > To: Hittner, David T (IS); simh at trailing-edge.com
> > Subject: RE: [Simh] Deathrow OpenVMS SIMH Node.. Hosted by OpenVMS?
> >
> > Hi Dave,
> >
> > Thanks for your response.
> >
> > On Tue, 10 Mar 2009 13:13:06 -0500 "Hittner, David T (IT)"
> > <david.hittner at ngc.com> wrote:
> > > Bill,
> > >
> > > The reason you don't see any networking under OpenVMS Alpha
> > is likely
> > > because you didn't install the VMS PCAP Execlet. I didn't
> see any
> > > reference to you doing so in the message below.
> >
> > I believe the Execlet was installed; if I recall correctly,
> > the behaviour and errors were very different before it was
> installed.> I'll check the next time I have a chance to work on
> this. In
> > the meantime, additional hints are welcome ;-)
> >
> > > Regarding running SIMH VAX on OpenVMS Alpha: that would be a
> gross
> > > waste of the Alpha unless it had absolutely nothing else to
> do. The
> > > performance of SIMH on a recent PC will decimate SIMH
> > performance on
> > > OpenVMS Alpha. Same for any Itegrity machines that you or I
> > can afford.
> > > :-)
> >
> > Hmm. I fear he doth exaggerate slightly :-)
> >
> > > All Alphas were excellent then, but the lower-end ones are
> somewhat
> > > slow now compared to high-end PCs. Higher-end
> > Alpha/Integrity machines
> > > might perform better, but still - SIMH really chews up
> > single-stream
> > > CPU cycles, and a PC is much cheaper.
> >
> > Yes, newer boxes are faster (and cheaper). But I already have
> > the Alpha and wanted to avoid building and configuring (yet)
> > another box needing care and attention, and adding to the
> power bill.
> > And since my "old" PCs are "really" old, buying a new PC for
> > this task seemed silly with a perfectly good Alpha to use.
> > SimH/VAX works fine (albeit off the network) and my
> > benchmarks show it running as well as a smaller MicroVAX.
> >
> > So I find the SimH/VAX hosted on OpenVMS is adequate,
> > especially for a hobbyist environment. Saves time and money,
> > runs solid, responds well, and the process (unless very
> > CPU-intensive) is barely noticed (i.e. buried in all the
> > other activity) on my lowly DS10 ;-) I'd sure like to
> try it
> > on an Integrity...
> >
> > So, let's not offhand rule out OpenVMS as a SimH host shall we
> :-)
> >
> > \bill
> > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > Bill
> Korendyk Bill at korendyk.net "Just call me Bill."
> > ---------------------------------------------------------------
> -----
> > "Where
> am I going... and why am I in a handbasket?"
> > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> >
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