Maxuproc parameter and number of processes Post: 303033193

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Operating Systems AIX Maxuproc parameter and number of processes Post 303033193 by trifo75 on Monday 1st of April 2019 09:35:59 AM

04-01-2019

Registered User

Thanks for the replies. Well, trying to be more specific.

There is an MQ server running on the host, running ps -ef at any time shows about 90 lines of output. This is quite normal, including the processes belonging to AIX itself, the MQ server and the monitoring scripts (5 maximum at any given moment).

This morning I found that the output of ps -ef shows just the same amount of processes as it usually does. Most of them remain live for an extended period, thus every app that succeeded to connect earlyer, is able to use the service. New connections cannot be created - new connections in this configuration implies new processes to handle a client.

Also I am unable to run any command that is not setuid root.

Now, raising the maxuproc value from 4096 to 5000 seems to solve the problem. Well, there is not a single user in the system trying to run 4000 processes, as I see 90 processes altogether. Why?

Couple of hours later the problem is showing up again the same way. Raising the maxuproc again solves the problem. Well, seems solving. Something is accumulating in the background and I do not see what that might be. So, when I run into this maxuproc problem, and maxuproc is set to 4096, then I would like to see thet something is really 4096. What kind of objects are counted? entries in process table? Threads? Or what else.

Well, I know how to list user parameters .

The relevant parameters of the relevant user are:

Code:

        fsize=2097151
        cpu=-1
        data=262144
        stack=65536
        core=2097151
        rss=65536
        nofiles=2000

Well, yes, maybe I was on a wrong track and the limit was not the number of processes, but some other limit. In this case my question is, why did the raise of maxuproc suppress the problem?

--Trifo

Last edited by jim mcnamara; 04-01-2019 at 10:55 AM..

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LEARN ABOUT HPUX

serialize

serialize(2)							System Calls Manual						      serialize(2)

NAME

       serialize() - force target process to run serially with other processes

SYNOPSIS

DESCRIPTION

       The  system call is used to force the target process referenced by the pid value passed in to run serially with other processes also marked
       for serialization.  If the value of pid is zero, then the currently running process is marked for serialization.  Once a process  has  been
       marked  by  the	process  stays	marked until process completion, unless is reissued on the serialized process with timeshare set to 1.	If
       timeshare is set to 1, the process specified in pid will be returned to normal timeshare scheduling algorithms.

       This call is used to improve process throughput since process throughput usually increases for large processes when they are executed seri-
       ally  instead  of allowing each program to run for only a short period of time.	By running large processes one at a time, the system makes
       more efficient use of the CPU as well as system memory, since each process does not end up constantly faulting in its working set, to  only
       have  the pages stolen when another process starts running.  As long as there is enough memory in the system, processes marked by behave no
       differently from other processes in the system.	However, once memory becomes tight, processes marked by are run one at	a  time  with  the
       highest	priority  processes being run first.  Each process runs for a finite interval of time before another serialized process is allowed
       to run.

RETURN VALUE

       returns zero upon successful completion, or nonzero if the system call failed.

ERRORS

       If fails, it sets (see errno(2)) to the following value:

	      The	     pid passed in does not exist.

WARNINGS

       The user has no way of forcing an execution order on serialized processes.

AUTHOR

       was developed by HP.

SEE ALSO

       serialize(1), privileges(5).

																      serialize(2)

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