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From: info-vax@ucbvax.ARPA
Newsgroups: fa.info-vax
Subject: Re: More memory for VMS V4
Message-ID: <6631@ucbvax.ARPA>
Date: Wed, 1-May-85 02:29:00 EDT
Article-I.D.: ucbvax.6631
Posted: Wed May  1 02:29:00 1985
Date-Received: Thu, 2-May-85 00:45:43 EDT
Sender: daemon@ucbvax.ARPA
Organization: University of California at Berkeley
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From: engvax!KVC@cit-vax

VMS V4 does indeed suck up more memory than an equivalently configured
V3 system.  However, when the system is NOT memory limited there really
isn't much difference in performance between V3 and V4.  Some things may
be slower and others faster, but on the whole my subjective impressions
of response time are no different. My system (ENGVAX) is an 8Mb.,
moderately loaded, 785 (used to be a 780).  Under VMS V3, we almost always
had quite a bit of memory left over.  Now we are usually within a few hundred
pages of using it all (we have more on order).

A moderately loaded 750 with 5 Mb that I've worked with quite a bit also
displays no real performance difference between V3 and V4.

Another 780 that I know of has only 4 Mb and a heavy user load.  System
response appears MUCH slower than V3 since the system spends a lot more time
paging to disk than before.  Unfortunately, they've also got an old controller
and little or no money to upgrade it.

Memory requirements on ENGVAX look to be about 1000 to 2000 more pages
than under V3 (0.5 to 1.0 Mb).  Again, I have no hard evidence for these
numbers, just feelings of what I remember from SHOW MEMORY.

	/Kevin Carosso              engvax!kvc @ CIT-VAX.ARPA
	 Hughes Aircraft Co.

ps.  Now that VMS V4 has been out for a little while, you can be certain
     that there will be a lot of people at DECUS next month who will have
     a lot to say about it.  Hopefully, we can all look forward to some
     real performance data.