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From: alan@encore.encore.COM (Alan Langerman)
Newsgroups: comp.sys.encore
Subject: Re: Multimax thrashing
Message-ID: <13705@encore.Encore.COM>
Date: 2 Jan 91 19:01:10 GMT
References: <1990Dec3.170300.14750@newcastle.ac.uk> <130064@infocenter.encore.com> <2166@sirius.ucs.adelaide.edu.au> <142@mx-1> <2195@sirius.ucs.adelaide.edu.au>
Sender: news@Encore.COM
Reply-To: alan@encore.com
Organization: Encore Computer Corp.
Lines: 20

In article <2195@sirius.ucs.adelaide.edu.au>, francis@cs.ua.oz.au (Francis Vaughan) writes:
|> This is a small precis.
|> 
|> 
|> Umax 4.3 release 4.0.0, and all previous releases of BSD Umax, contain
|> a serious bug in the virtual memory system that prevents it from being
|> able to page out pages of processes under certain commonly occurring
|> circumstances.

Please note that Encore's other operating system products (Mach, UmaxV)
do not suffer from this particular bug.  (Of course, they may suffer from
other bugs.)

For those who care, Encore Mach Release 1.0 looks to the user/programmer
like a 4.3BSD Tahoe system and reads/writes existing 4.3BSD filesystems.
It also has full server and client NFS.  However, it does NOT support
Umax4.3-isms like inq_stats, dread/dwrite, etc.  Release 1.0 is available now.

Alan Langerman
Mach Group, OSF/1 Project