Performance degradation with KSH93 Post: 302303183

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Top Forums Shell Programming and Scripting Performance degradation with KSH93 Post 302303183 by i.f.schulz on Thursday 2nd of April 2009 04:48:02 AM

04-02-2009

Registered User

Performance degradation with KSH93

Hi,

I have a script that calls an external program to perform some calculations and then I read with "grep" and "sed" values from the output files. I've noticed that performance of KSH93 degrades with every iteration. The output files are all the same size, so I don't understand why after the first calculation it takes 5 seconds to read the values but after the 50th calculation it takes ~1 minute. Besides that, everything is working correctly, no error messages.

I had the same problem a couple of months ago with a simpler script. Back then I just executed the script with KSH88 and the problem was gone (I wasn't using any special features of KSH93).

But this actual script has gotten very complex using lots of KSH93 specific stuff, so I cannot use KSH88 here.

I've searched the internet concerning performance degradation, but found only a hint to a bug with the "unset" command. Well, I was using the "unset" command for some array variables, but even after commenting these lines out, the problem was still there.

Has anyone heard anything about KSH93 getting slower and slower with time?

By the way, I'm on a AIX 5.2 machine.

Thanks, Ingo

i.f.schulz

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LEARN ABOUT CENTOS

pmdapostfix

PMDAPOSTFIX(1)						       Performance Co-Pilot						    PMDAPOSTFIX(1)

NAME

       pmdapostfix - Postfix performance metrics domain agent (PMDA)

DESCRIPTION

       pmdapostfix is a Performance Metrics Domain Agent (PMDA) which exports mail queue sizes as reported by qshape(1), as well as aggregate
       statistics collected from mail.log.

INSTALLATION

       If you want access to the names and values for the Postfix performance metrics, do the following as root:

	   # cd $PCP_PMDAS_DIR/postfix
	   # ./Install

       If you want to undo the installation, do the following as root:

	   # cd $PCP_PMDAS_DIR/postfix
	   # ./Remove

       pmdapostfix is launched by pmcd(1) and should never be executed directly.  The Install and Remove scripts notify pmcd(1) when the agent is
       installed or removed.

FILES

       $PCP_PMDAS_DIR/postfix/Install
	   installation script for the pmdapostfix agent

       $PCP_PMDAS_DIR/postfix/Remove
	   undo installation script for the pmdapostfix agent

       $PCP_LOG_DIR/pmcd/postfix.log
	   default log file for error messages from pmdapostfix

SEE ALSO

       pmcd(1) and qshape(1).

3.8.10							       Performance Co-Pilot						    PMDAPOSTFIX(1)

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