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From: marc@arnor.uucp
Newsgroups: comp.unix.aix
Subject: Re: '6000 performance issue
Message-ID: <MARC.90Nov19114826@marc.watson.ibm.com>
Date: 19 Nov 90 16:48:26 GMT
References: <1990Nov19.042905.26880@i88.isc.com>
Sender: news@arnor.uucp (NNTP News Poster)
Organization: IBM T.J. Watson Research Center, Hawthorne, New York
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In-Reply-To: mikebe@i88.isc.com's message of 19 Nov 90 04:29:05 GMT

In article <1990Nov19.042905.26880@i88.isc.com> mikebe@i88.isc.com (Michael G. Beirne) writes:

>This sounds like a performance problem to me. What happens when 5 or 6 people
>start up Frame on a RS/6000 and the whole program is in paging/memory area
>for each user instead of just the data and bss area separate for each user?

Programs are executed out of a memory mapped instance of the text
file.  There will be only one copy (at most) of each page of the text
no matter how many processes run the program.  The same thing is true
of shared libraries, like libc.a and libX11.a.

Of course, each process has its own copy of any data pages it has
touched.


Marc Auslander