Date: Fri, 30 Aug 1996 08:52:08 -0500 (CDT) From: Joe Greco <jgreco@brasil.moneng.mei.com> To: froden@bigblue.no Cc: isp@freebsd.org Subject: Re: Max users/max processes in FreeBSD?? Message-ID: <199608301352.IAA08372@brasil.moneng.mei.com> In-Reply-To: <199608292312.BAA14425@login.bigblue.no> from "Frode Nordahl" at Aug 30, 96 01:13:51 am
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> login:~# limit [vt220] > cputime unlimited > filesize unlimited > datasize 65536 kbytes > stacksize 8192 kbytes > coredumpsize unlimited > memoryuse 14988 kbytes > descriptors 64 > memorylocked 9994 kbytes > maxproc 40 > login:~# uname -a > FreeBSD login.bigblue.no 2.1.0-RELEASE FreeBSD 2.1.0-RELEASE #0: Wed Aug 7 14:5 > 4:17 MET DST 1996 root@login.bigblue.no:/usr/src/sys/compile/LOGIN i386 > login:~# > > This is what I get on FreeBSD 2.1.0-STABLE (Cannot run 2.1.5 on this machine due to incompatibility of some > nature) > > So, the MAXUSER directive in the kernel confiugration can be set to whatever I want? You know where one > might find the proc directive? The MAXUSERS directive can be set to whatever. However, it is NOT a limit to the number of simultaneous users you can have online! It is simply a guideline that helps the kernel scale a number of things to the size you expect to need. Obviously running 200 users on a box with MAXUSERS 10 may fail... probably due to proc table overflow... but running 20 is quite possible and reasonable. Last I checked, and it was a while ago, MAXUSERS directly or indirectly contributes to the sizes of things like the proc and maxfiles and MBCLUSTERS variables. These are all things you want larger on a busy system. As for "maxproc" - type "unlimit; limit" :-) There is a way to change the 40 default in the kernel but it is generally considered the wrong thing to do so. Also note, MAXUSERS has a warning if you go > 64. This is mainly to warn people who are doing silly things like setting MAXUSERS=2048 on a 16MB box. The setting of MAXUSERS does affect kernel resource consumption, so be reasonable with it. The old Sun guidelines are still pretty good: Start with 16 Add one for every logged in user you expect Add one for every NFS client you expect Add one for every xterm window you expect Round up to an even power of 2 Side note: Usually you are doing something wrong if MAXUSERS > Memory Size in MB.. ... JG
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