Path: utzoo!utgpu!water!watmath!julian!deepthot!zaphod
From: zaphod@deepthot.UUCP (millions of atoms of Lance)
Newsgroups: comp.sys.hp
Subject: Re: hp9000 ser. 500 hpux
Keywords: multi-cpu
Message-ID: <1098@deepthot.UUCP>
Date: 14 Mar 88 13:26:33 GMT
References: <987@maccs.UUCP> <4760006@hpfcls.HP.COM> <672@kuling.UUCP>
Reply-To: zaphod@deepthot.UUCP
Organization: UWO CS, London Canada
Lines: 33
Posted: Mon Mar 14 08:26:33 1988

In article <672@kuling.UUCP> irf@kuling.UUCP (Bo Thide) writes:

>   ...                                       We don't even think an 800
>series can compete with a 500 with 2 or 3 computers in terms of multi-user
>capablility. So the logical question here is:  Why doesn't HP have a
>multi-CPU 800?  Was the experience with the 500 series so bad that HP has
>given up that idea?

I agree.  
Our main application of our 2 CPU 9000/550 is data collection, at
1am a schedular starts up that phones 50 PC's around North America
and exchanges data with them. The only action between the two machines
is the simultaneous of information (grouped together as a single file).
To save time we have multiple modems, allowing concurrent sessions.

when we went from one modem/session-at-a-time to two, we noticed a
definite throughput increase (sessions acheived/ time period) .
when we went from two to three, we did not not an improvement, but
rather a decrease in thoughput as communication sessions began to
time out while two CPU tried to do three i-o intensive operations.

to acheive even better throughput, we are tacking in a third CPU.

on applications such as ours (concurrent near-identical sessions),
a multi CPU machine is a neccessity.
-- 
humbly yours, Lance Bailey 
              UWO,  Dept. of Comp. Science  |   Robarts Research Institute
              Graduate Studies              |   Clinical Trials Resources Group
              London, Canada                |   PO Box 5015, 100 Perth Dr.
              N6A 5B7                       |   London, Canada, N6A 5K8

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