[SUMMARY] Max number of processes per user

From: foster@bial1.ucsd.edu
Date: Wed Dec 03 1997 - 12:49:10 CST

[SUMMARY] Max number of processes per user

I had originally asked how to adjust the maximum number of processes
allowed per user. I had the answer before I got my own question!
Thank-you very much:

        "Arora, Samir" <sarora@ELDEC.com>
        nesrin_ozus@karmaint.com
        Antonia Gomez <antonia@fib.upc.es>
        Christophe DIARRA <diarra@ipno.in2p3.fr>
        Mike Zeleznik mzeleznik@usr.com
        Chris Marble <cmarble@orion.ac.hmc.edu>
        Urvashi Shah <shah@math.ufl.edu>

In short, you edit /etc/system and add the line

        set maxuprc=500 (default is 100)

and then reboot.

You can use sysdef to list the tunable parameters:

   *
   * Tunable Parameters
   *
     630784 maximum memory allowed in buffer cache (bufhwm)
        490 maximum number of processes (v.v_proc)
         99 maximum global priority in sys class (MAXCLSYSPRI)
        100 maximum processes per user id (v.v_maxup)
         30 auto update time limit in seconds (NAUTOUP)
         25 page stealing low water mark (GPGSLO)
          5 fsflush run rate (FSFLUSHR)
         25 minimum resident memory for avoiding deadlock (MINARMEM)
         25 minimum swapable memory for avoiding deadlock (MINASMEM)

The parameters to adjust are:

        set maxusers=300
        set maxuprc=64
        set max_nprocs=3096
        set pt_cnt=768
        set npty=768
        set nautopush=768

Here are some individual responses which contain more information:

------------------------------------------------------------------------------
sysadm@its.brooklyn.cuny.edu Bill

in /etc/system add

set maxuprc=100
            ^^^ less than maximum number of processes as shown by
sysdef

*
* Tunable Parameters
*
  630784 maximum memory allowed in buffer cache (bufhwm)
     490 maximum number of processes (v.v_proc)
      99 maximum global priority in sys class (MAXCLSYSPRI)
     100 maximum processes per user id (v.v_maxup)
      30 auto update time limit in seconds (NAUTOUP)
      25 page stealing low water mark (GPGSLO)
       5 fsflush run rate (FSFLUSHR)
      25 minimum resident memory for avoiding deadlock (MINARMEM)
      25 minimum swapable memory for avoiding deadlock (MINASMEM)

and reboot.

------------------------------------------------------------------------------
<Sorry, I lost the reference>

Have you tried adjusting the maxuser's parameter in the /etc/system
file? According to "Sun Performance and Tuning" by Adrian Cockcroft of
Sun Microsystems (you can order the book by SunExpress - I highly
recommend it!), page 187, the number of processes is set to:
 
    10 + 16 * maxusers
 
If you don't want to play with the maxusers parameter (it does effect a
lot of other tables), it looks like you can also set max_nprocs to be
the size of your desired process table. Be aware, though, this
parameter also affects other tables (inode cache, name cache, etc.)
------------------------------------------------------------------------------
" Rogerio Rocha - BVL - Lisbon Stock Exchange -I.S." <rogerio@bvl.pt>
 
Edit /etc/system, to insert higher values for :
 
set maxusers=300
 
set maxuprc=64
 
set max_nprocs=3096
 
set pt_cnt=768
 
set npty=768
 
set nautopush=768
------------------------------------------------------------------------------
 
 

  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    David S. Foster Univ. of California, San Diego
     Programmer/Analyst Brain Image Analysis Laboratory
     foster@bial1.ucsd.edu Department of Psychiatry
     (619) 622-5892 8950 Via La Jolla Drive, Suite 2240
                            La Jolla, CA 92037
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   

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