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From: wbpesch@ihuxp.UUCP (Walt Pesch)
Newsgroups: net.database
Subject: INGRES Back-end Processes & Paging Unix
Message-ID: <1196@ihuxp.UUCP>
Date: Sat, 21-Sep-85 14:16:57 EDT
Article-I.D.: ihuxp.1196
Posted: Sat Sep 21 14:16:57 1985
Date-Received: Sun, 22-Sep-85 06:27:11 EDT
Organization: AT&T Bell Laboratories
Lines: 42

Our group is currently designing an application that will use INGRES
as our database manager.  (More specifically, we are using AT&T INGRES, 
which when the new version is released will correspond to RTI's Version 
Three.)

Each INGRES invocation creates a back-ground process.  This sizes to
about half a meg, with a quarter-meg as sharable text and the other
quarter-meg as the data segment, unique for each process that has
invoked INGRES.

Because our application can have upwards of 100+ processes running on
a dedicated 3B20 (most of which will want database access), our
swapping rate for the background process would bring the machine to 
its knees.  The normal response would be to have some background 
daemons that would feed off a message queue and do the database 
accesses for the rest of the processes.

My question is what will be the effects of Paging Unix (specifically 
5.2.2 - I hope that's the right name).  Does anyone have any
information as to the characterization of the page fault rates and
locations for the background process?  If INGRES is only normally 
bopping around say 20K instead of a quarter-meg, we can change our
approach and have each process access INGRES.  This would be
allow us to eliminate a whole level of interfaces, and save both
real-world and system time.

I hope that someone out there can shed some light on the effects of
Paging Unix on the data segment (especially you folks out at RTI).  
I am interested in anything pertaining to this, whether it be from 
4.2 or whatever.



Walt Pesch
AT&T Network Systems
ihnp4!ihuxp!wbpesch
(312) 510-6237
Cornet 345-6237
-- 
Walt Pesch
AT&T Network Systems
ihnp4!ihuxp!wbpesch


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