Re: Profiling RPGLE programs

[Charles Wilt <charles.wilt@xxxxxxxxx>]

Performance Explorer (PEX) data will show that...

Carsten provided a link...

The iDoctor tools provide and much nicer GUI into the collected PEX data...

We once found a program taking 30% of our CPU (across 30K users...)

PEX was used to provide the following
"Statements that use the most CPU in BADPGM are the following:
79100, 79400, 79700, 80000, 80300, 80600.
Next busiest statements are:74700, 75200, 75700, 76200, 76800, 77,300, 78700
"

Took maybe an 1hr to fix (%trim() was being used repeatedly) during the
next scan BADPROGRAM wasn't using enough CPU to show up...

Charles




On Wed, Feb 19, 2020 at 1:12 PM Roger Harman <roger.harman@xxxxxxxxxxx>
wrote:

> I haven't seen the code yet.  I was hoping to get a histogram type view of
> the hot spots.
>
> Roger Harman
> COMMON Certified Application Developer - ILE RPG on IBM i on Power
>
> --
>
> From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxxxxxxxx> on behalf of
> Justin Taylor <JUSTIN@xxxxxxxxxxxxx>
> Sent: Wednesday, February 19, 2020 10:13 AM
> To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx>
> Subject: RE: Profiling RPGLE programs
>
> I normally eyeball the code, identify likely culprits and have it write to
> the joblog.  I iterate thru that process until I narrow down the cause.
>
> HTH
>
>
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>
>
>
> -----Original Message-----
>
> From: Roger Harman [mailto:roger.harman@xxxxxxxxxxx]
>
>
> Sent: Wednesday, February 19, 2020 11:04 AM
>
> To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx>
>
> Subject: Profiling RPGLE programs
>
>
>
> I have a request from a sister division to look at (and, hopefully
> improve) a program that is VERY long running - like 2 days long.
>
>
>
> My first thought was I need to know the hot spots in the program but, in
> all my years on this platform, I've never needed to profile a program.
>
>
>
> Does anyone have any tips, a simple cheat sheet, or primer on the steps
> involved?
>
>
>
> Thanks!
>
>
>
> Roger Harman
>
> COMMON Certified Application Developer - ILE RPG on IBM i on Power
>
>
>
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>
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