| Title: | "ASK THE WIZARDS" |
| Moderator: | QUARK::LIONEL |
| Created: | Mon Oct 30 1995 |
| Last Modified: | Mon May 12 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 1857 |
| Total number of notes: | 3728 |
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From: "VMS001::WWW"@vms001.das-x.dec.com (04-Apr-1997 1005)
To: [email protected], [email protected], [email protected]
Subject: Ask the Wizard: '[email protected]'
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Name: Nina L. Wolf
Email Address: [email protected]
CPU Architecture: VAX
Version: v 5.5-2
Questions:
Is there an actual limit to how many users a
MicroVAX 3100/40 will allow when an unlimited
user license is installed? If it is truly
unlimited, are there resource limitations that
can be adjusted to allow more users?
I tested this on a MicroVAX 3100/20 and could not
connect more than 16 users. The Model 40 seemed
to allow a couple more.
Thanks,
Nina
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 1714.1 | Hard Limits Well Past What This System Can Support... | XDELTA::HOFFMAN | Steve, OpenVMS Engineering | Wed Apr 09 1997 11:28 | 31 |
No computer yet invented is infinitely powerful...
And storage and processor requirements traditionally expand to
exceed what is presently available...
There are always limits to the number of users: memory, processor
performance, disk space, etc. All these factors are affected by
the specific application(s) being used, and by user expectations.
Common "configurable" limits include the amount of physical memory
configured, the IJOBLIM parameter (See SET LOGIN/INTERACTIVE), the
size(s) of the process workingset(s), and various SYSGEN parameters
such as NJOBLIM, MAXPROCESSCNT, BALSETCNT, VIRTUALPAGECNT, and
various other associated or derived settings... And the appropriate
sizes for the pagefile(s) and swapfile(s) are normally derived from
these SYSGEN paramters.
OpenVMS VAX "hard" limits include the size of system space (which
effectively limits the values derived from the MAXPROCESSCNT and
VIRTUALPAGECNT interactions), and the "hard" MAXPROCESSCNT limit
of 8192 processes. (OpenVMS Alpha increases MAXPROCESSCNT limit
to 16384, and tends to avoid the derived MAXPROCESSCNT/VIRTUALPAGECNT
limits on system space due to differences in the OpenVMS Alpha V7.0
memory management model.
SYSGEN parameters should be adjusted only via AUTOGEN. Note that
random tweaking can often reduce the overall system performance --
AUTOGEN determines reasonable values for most settings. Periodic
AUTOGEN passes -- with FEEDBACK -- should be performed over time,
to better "dial in" the parameter settings based on actual usage.
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