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From: oz@yetti.UUCP (Ozan Yigit)
Newsgroups: net.unix
Subject: Re: Unix on the Vax 8600
Message-ID: <205@yetti.UUCP>
Date: Thu, 4-Jul-85 14:54:19 EDT
Article-I.D.: yetti.205
Posted: Thu Jul  4 14:54:19 1985
Date-Received: Thu, 4-Jul-85 18:41:49 EDT
References: <1513@emory.UUCP> <7500004@pbear.UUCP>
Reply-To: oz@yetti.UUCP (Ozan Yigit)
Organization: York University Computer Science
Lines: 31
Keywords: 8600, performance
Summary: 

In article <7500004@pbear.UUCP> peterb@pbear.UUCP writes:
>
>
>	Since the 8600 still uses the same I/O structure as the 780's, heavy
>swap will slow a 8600 down.
>
	The only reason that an 8600 will slow down is because
	the 8600 is the only VAX that can push say an RA81 to its
	performance limit. 

>	Piling on more users to an 8600 will slow I/O somewhat since the
>unibus is still there, but cpu intensive processes will excell on the 8600.
>
	Even an 8600 does not use up the entire unibus bandwidth. We found
	that our 8600 was on its knees (running VMS) because of a job with 
	extremely high paging rate. It actually was due to an RA81 
	(there was only one disk at that time) becoming a bottleneck, 
	NOT the unibus.

Oz

-- 

Oz	[all wizardesque side effects are totaly unintentional,
	unless stated otherwise..]

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