LDDOIM & LDDSCH - High Cpu Consumption

Schollaert

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Oct 30, 1997, 3:00:00 AM10/30/97

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Can anybody tell me what trigers these tasks (LDDOIM & LDDSCH) on my AS/400
? and eventually how I can control them.

LDDOIM task takes at certain moments more than 100 % of the CPU Power.
Data in the QAPMJOBS performance file indicate 6 million Cpu milliseconds
in a 1058 second interval (quite performing isn't it ?)

LDDSCH taks uses somewhat less, but still quite high

I'm running a 320 with version 3.2 installed

Thanks.

Wim Schollaert

Paul Nicolay

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Oct 30, 1997, 3:00:00 AM10/30/97

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Hi Wim,

Both jobs don't look like system jobs, but rather as application software.
I'll guess you'll have to look in this area and consult the company or
programmer that installed it.

Regards,
Paul
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Schollaert <wim.sch...@ampvd.be> wrote in article
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Dave McKenzie

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Oct 30, 1997, 3:00:00 AM10/30/97

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Wim,

"LD" means Load/Dump, what the VLIC guys call Save/Restore. LD-tasks
do save/restore functions.

Dave
_________________________________________
On 30 Oct 1997 20:53:21 GMT, "Schollaert Wim"
<wim.sch...@ampvd.be> wrote:

>hey Paul,
>LDDxxx are real tasks, no user and no job number. I can only see them thru
>WRKSYSACT. Could this be application software ?
>Regards,
>Wes

>
>
>>
>> Both jobs don't look like system jobs, but rather as application
>software.
>> I'll guess you'll have to look in this area and consult the company or
>> programmer that installed it.
>
>>

Schollaert Wim

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Oct 30, 1997, 3:00:00 AM10/30/97

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Bradley V. Stone

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Oct 30, 1997, 3:00:00 AM10/30/97

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On 30 Oct 1997 20:53:21 GMT, "Schollaert Wim"
<wim.sch...@ampvd.be> wrote:

We had a time when I saw those jobs running a lot. And also the LDIOM
job. I asked about the LDIOM job and found out it's a Load Dump IO
Manager and that it had to do with save/restore. but we were also at
about 97% DASD, so who knows.

I did a search through the IBM books and it didn't say what they are.
They were just on some performence exercise.
Bradley V. Stone
bvs...@usa.net
http://prairie.lakes.com/~bvstone/
1992 Yamaha FJ1200
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Brian Coyle

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Oct 31, 1997, 3:00:00 AM10/31/97

to Schollaert

Schollaert wrote:
>
> Can anybody tell me what trigers these tasks (LDDOIM & LDDSCH) on my
> AS/400 ? and eventually how I can control them.
>
> LDDOIM task takes at certain moments more than 100 % of the CPU Power.
> Data in the QAPMJOBS performance file indicate 6 million Cpu
> milliseconds in a 1058 second interval (quite performing isn't it ?)
>
> LDDSCH taks uses somewhat less, but still quite high
>
> I'm running a 320 with version 3.2 installed
>
> Thanks.
>
> Wim Schollaert

The LDxxxx tasks are Load/Dump modules. You probably had a
save/restore occurring during the performance snapshot.

I have seen these modules consume quite a lot of CPU when the
save/restore is running in a memory constrained pool. The
solution is to watch where you run the save/restore...

GOOD LUCK!
-- Brian

@WORK-- mailto:Brian...@corp.disney.com
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