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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
Old 04-01-2019
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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qpsmtpd-prefork(8)					      System Manager's Manual						qpsmtpd-prefork(8)

NAME
qpsmtpd-prefork - Preforkin server for qpsmtpd SYNOPSIS
qpsmtpd-prefork [options] DESCRIPTION
qpsmtpd-prefork is the qpsmtpd frontend script which binds to the SMTP TCP socket, and asynchronously forks new children in advance of new connections. OPTIONS
--port port Binds to a specific port, instead of the default 2525. --user user On startup, switch to run as user instead of the starting user. Applies only when started as root (as is normal when listening on port 25). --limit-connections limit Accept at most limit simultaneous connections. Inbound connections beyondthis limit will be deferred or refused. --max-from-ip limit Accept at most limit simultaneous connections from any given IP address; does not override --limit-connections, if set. --children limit Limit the total number of child processes to limit; once all children are handling requests, further connections are deferred. --idle-children count Keep count child processes available, subject to the upper bound given via --children. Specify 0 to disable preforking entirely. --interface addr Bind to the local address addr, instead of the default behavior of binding to all interfaces. Can be specified multiple times to bind to more than one interface or local address. --renice-parent delta Adjust the priority of the parent process by delta, yielding more CPU time to other processes. The default is 5. --detach Detach from the controlling terminal at startup, to run as a standalone daemon. See also --pid-file. --pid-file filename Upon startup, and after daemonizing if applicable, write the process ID to filename, for use by sysvinit control scripts or similar utilities. --pretty-child Update child process names within the process table. --version Print the qpsmtpd release version and exit. --debug Be somewhat more verbose about logging during startup (has no effect once fully started). --help Display commandline help and exit. AUTHOR
Copyright (c) 2006, SoftScan; based on qpsmtpd-forkserver by Ask Bjorn Hansen <ask@develooper.com> http://smtpd.develooper.com/ qpsmtpd-prefork(8)
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