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Operating Systems AIX Maxuproc parameter and number of processes Post 303033181 by Don Cragun on Monday 1st of April 2019 07:09:05 AM
Old 04-01-2019
If you are hitting a limit on the number of processes you're running, ps may be exempt from the limit because it usually runs set-UID root.

If you're running ps -ef | grep "<username>" or some other pipeline, even though ps might be exempt from the limit, the pipeline is not exempt and the output you're seeing could be truncated if the grep is killed due to the process limit.

Are you seeing this problem consistently? Or does it vary with time of day, or at times when cron or at jobs might be expected to be running? You say you're seeing about 90 processes running. Are they all things that you expect to be running? Are any of them things that hang around running for a while and then kick off a bunch of other processes to perform certain tasks when certain conditions arise?

Could network traffic be kicking off jobs that are being run by processes running under your account?

Do you have a bunch of MQ monitoring scripts running in the background? What are they doing? How many of them are there?

Obviously, with no access to your system, we can only make wild guesses. I agree that it sounds like you're running enough processes that AIX isn't letting you start any more until one or more of the jobs that are running terminate, but that doesn't help much if we don't know what is running and why it is running.

Is process accounting enabled on your system? Can you sysadmin help you track down what jobs you're running during times when your processes are being killed?
 

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qterm(8B)								PBS								 qterm(8B)

NAME
qterm - terminate processing by a PBS batch server SYNOPSIS
qterm [-t type] [server...] DESCRIPTION
The qterm command terminates a PBS batch server. When a server receives a terminate command, the server will go into a terminating state. While in this state, the server will not allow new jobs to be started or enqueued. By default, qterm will request a "quick" shutdown of the PBS server. Other ways of shutting down the server (specified with the -t argument), and their impact on running jobs, are described below. The qterm command will not exit until the server has completed its shutdown procedure. In order to execute qterm, the user must have PBS Operation or Manager privilege. OPTIONS
-t type Specifies the type of shut down. The types are: immediate All running jobs are to immediately stop execution. If checkpoint is supported, running jobs that were submitted with "-c shutdown" are checkpointed, terminated, and requeued. If checkpoint is not supported or the job cannot be checkpointed, running jobs are requeued if the rerunable attribute is true. Otherwise, jobs are killed. Normally the server will not shutdown until there are no jobs in the running state. If the server is unable to contact the MOM of running job, the job is still listed as running. The server may be forced down by a second qterm -t immediate command. delay If checkpoint is supported, running jobs that were submitted with "-c shutdown" are checkpointed, terminated, and requeued. If a job cannot be checkpointed, but can be rerun, the job is terminated and requeued. Otherwise, running jobs are allowed to continue to run. Note, the operator or administrator may use the qrerun and qdel commands to remove run- ning jobs. quick This option is used when you wish that running jobs be left running when the server shuts down. The server will cleanly shutdown and can be restarted when desired. Upon restart of the server, jobs that continue to run are shown as running; jobs that terminated during the server's absence will be placed into the exiting state. OPERANDS
The server operand specifies which servers are to shutdown. If no servers are given, then the default server will be terminated. STANDARD ERROR
The qterm command will write a diagnostic message to standard error for each error occurrence. EXIT STATUS
Upon successful processing of all the operands presented to the qterm command, the exit status will be a value of zero. If the qterm command fails to process any operand, the command exits with a value greater than zero. SEE ALSO
pbs_server(8B), qmgr(1B), pbs_resources_aix4(7B), pbs_resources_irix5(7B), pbs_resources_sp2(7B), pbs_resources_sunos4(7B), and pbs_resources_unicos8(7B) Local qterm(8B)
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