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Re: how to set per user process limit on Solaris? (fwd)

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  • Subject: Re: how to set per user process limit on Solaris? (fwd)
  • Date: Mon, 18 Dec 2000 12:35:08 -0700
>From: Tom McDermott <address@hidden>
>Subject: LDM: out of per user processes
>Organization: SUNY Brockport
>Keywords: 200012141622.eBEGM4o06206 LDM processes

Tom,

Here's the information I promised on how to set a per usr process
limit for the number of processes that the LDM user can spawn.  If you
set a generous limit, it should allow the LDM to run as intended but
protect other users in case something ever happens that causes lots of
processes to be spawned.

By the way, I heard another possible explanation for the symptom you
saw of too many processes on your LDM server: if any of your decoders
write to an NFS-mounted file system and connectivity to the NFS server
is lost or it crashes, depending on the characteristics of the NFS
mount lots of processes could hang waiting to write.

--Russ

_____________________________________________________________________

Russ Rew                                         UCAR Unidata Program
address@hidden                     http://www.unidata.ucar.edu


------- Forwarded Message

Date:    Mon, 18 Dec 2000 10:39:40 -0700
From:    "Mike Schmidt" <address@hidden>
To:      address@hidden, address@hidden,
         address@hidden
Subject: Re: how to set per user process limit on Solaris?

Russ,

On a Solaris 2.7 system, one can set system wide user process limits via
the maxuprc variable in /etc/system.  One can also query (and set dynamic
variables) in the kernel;

# adb -k /dev/ksyms /dev/mem
maxusers/D
max_nprocs/D    (system wide process limit - default = 10 + 16 * maxusers)
maxuprc/D       (user process limit - default = max_nprocs - 5)

The book "Sun Performace and Tuning" provides a good reference for this
and more information, most of which is freely availavle on Sun's website.

mike

On Dec 15,  3:32pm, Russ Rew wrote:
> Subject: how to set per user process limit on Solaris?
> Hi,
>
> Do any of you know how to set an upper limit on the number of
> processes a user can have running on Solaris 2.7 or later.  I had
> thought ulimit(1) could be used for this purpose, but it doesn't seem
> possible from reading the man page.
>
> The reason I want to do this is to advise an LDM site administrator
> how to limit the number of processes that can be spawned by the LDM,
> running under the "ldm" userid.  This user is worried that the LDM
> could fill up the process table if something goes wrong, and so wants
> some upper limit enforced on the number of processes that can run
> under userid "ldm".
>
> --Russ
>
>-- End of excerpt from Russ Rew


------- End of Forwarded Message