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List:       aix-l
Subject:    Re: Impact of maxuproce kernel parm
From:       Bruce Zimmer <b.r.zimmer () worldnet ! att ! net>
Date:       2002-04-26 17:46:09
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MAXUPROC is used to calculate some of the kernel tables and therefore
increasing it to an unnecessarily high value will cause some waste of kernel
table space.  If there is an abundance of RAM, the kernel tables still will
not be excessivly large and will cause no adverse effects.

Bruce Zimmer

----- Original Message -----
From: "Badger, Claude P" <claude.badger@EDS.COM>
Newsgroups: bit.listserv.aix-l
To: <aix-l@Princeton.EDU>
Sent: Friday, April 26, 2002 12:29 PM
Subject: Impact of maxuproce kernel parm


>         I have a question regarding fine-tuning the AIX kernel to support
a
> larger number of processes for my team's application.  Our application
uses
> a single user id for all of its processes and we have recently had to
> increase the "maximum number of processes per user"  value from our
> historical 200 to 400: as customer sites migrate to the newer, more
powerful
> hardware, they are increasing the load on the boxes.
>
>         We arrived at the new value by fully loading our application on
the
> newer hardware with the maximum number of processes the current design can
> support (~240 processes) and adding a fudge factor of >50%.  There are few
> processes for this user other than the application process themselves as
> started by our master control program so we feel we have a realistic
handle
> on the number of processes likely to run.
>
>         Searching the IBM documentation I have identified the kernel
> parameter controlling this (maxuproc) but cannot find any guidelines as to
> how to assess what the right value is: i.e. why would we not set the value
> to "9999" (I found a reference to this value for Oracle) and effectively
> forget about it?  Does anyone know what the impact of this tunable
parameter
> is and what limit might exist?
>
>
> Claude Badger
> Infrastructure Specialist
> Canada Information Solutions
> 1615 Dundas Street East
> Whitby, ON
> Canada L1N 7S6
> Ph: 905 644 2868
> Fax: 905 644 1624
> claude.badger@eds.com <mailto:claude.badger@eds.com>
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