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Maxuproc parameter and number of processes

 
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Old 04-01-2019
Maxuproc parameter and number of processes
Hi there,

I am having a problem on an AIX server running a WebSphere MQ instance. The problem is that sometimes it seems to reach process limit, but I do not find the processes themselves.

What I see: succeed to log in (as root from console os as nonpriviliged user via ssh). Trying to run almost any command results in a message "Killed.", even a simple "ls" command. However "ps -ef" command is able to run. MQ monitoring scripts gets killed. vmstat cannot run, but lsps shows no paging activity. thus there should be enough memory. Also topas is able to run, showing very little CPU activity.
This "Killed." thing - by my experience - used to be the result of reaching maxuproc limit, but the maxuproc is set to 4096 and the ps -ef shows only ~90 processes. However. when I raise the maxuproc parameter, everything works fine again.

Well, my question is: how to monitor if I am reaching maxuproc limit? Or: where are the processes which are not listed by ps command.

Best regards,
--Trifo
 
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LEARN ABOUT DEBIAN

hwloc-ps

HWLOC-PS(1)							       hwloc							       HWLOC-PS(1)

NAME

       hwloc-ps - List currently-running processes that are bound.

SYNOPSIS

       hwloc-ps [options]

OPTIONS

       -a	 list all processes, even those that are not bound to any specific part of the machine.

       -p --physical
		 report OS/physical indexes instead of logical indexes

       -l --logical
		 report logical indexes instead of physical/OS indexes (default)

       -c --cpuset
		 show process bindings as cpusets instead of objects.

       --whole-system
		 Do not consider administration limitations.

DESCRIPTION

       By  default,  hwloc-ps  lists  only  those currently-running processes that are bound; it displays their their identifier, command-line and
       binding.  The binding may be reported as objects or cpusets.  By default, process bindings are restricted to the currently available topol-
       ogy.  If  some  processes  are bound to processors that are not available to the current process, they are ignored unless --whole-system is
       given.  The output is a plain list. If you wish to annotate the hierarchical topology with processes so as to see how they are actual  dis-
       tributed on the machine, you might want to use lstopo --ps instead (which also only shows processes that are bound).

       The -a switch can be used to show all processes, if desired.

SEE ALSO

       hwloc(7), lstopo(1), hwloc-calc(1), hwloc-distrib(1)

1.4.1								   Feb 27, 2012 						       HWLOC-PS(1)