Re: [MI400] High Performance parallel run programming

["sas" <sas@xxxxxxxxxx>]

Dear Kaare,
Do you have any program sample doing this ? would you be so kind to share
the code ?
Regards,
Sas

----- Original Message -----
From: "Kaare Plesner, SOSY A/S" <kaaple@attglobal.net>
To: "MI Programming on the AS400 / iSeries" <mi400@midrange.com>
Sent: Wednesday, January 15, 2003 6:28 PM
Subject: RE: [MI400] High Performance parallel run programming

I have in several cases been able to speed up applications considerably by
running in parallel like you describe. You cannot expect that splitting up
in 5 jobs will make it 5 times faster - you might need say 7 or 8 parallels
to achieve improvement by factor 5.

The gain obviously depends upon the spare CPU and database I/O capacity on
your computer while running this job. As long as there is free capacity, you
should gain by adding another job. But if your job when running alone is
using say 50% CPU, and OS/400 and other jobs are using 10%, then you
obviously should not start more than one additional job.

Before splitting the job into several you might want to look at blocked I/O,
i.e. having the files involved sorted in the same sequence and using the
OVRDBF command SEQONLY and NBRRCDS keywords. If this is possible, and if the
job in that way can use 100% CPU, then nothing else could be faster.

Regards,   Kaare

============================================
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iSeries or AS/400 - let us solve the problem
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Kaare Plesner        I     SOSY A/S
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mailto:kp@sosy.dk    I     DK-2620 Albertslund
                     I     Denmark
Home office:         I     Tel +45 4494 8105
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-----Original Message-----
From: mi400-bounces@midrange.com [mailto:mi400-bounces@midrange.com]On
Behalf Of sas
Sent: Wednesday, January 15, 2003 7:49 AM
To: mi400@midrange.com
Subject: [MI400] High Performance parallel run programming

Dear all ,
Does anyone on the list has any experience doing parallel run programing?
background :
suppose we have one million record should be read and it will take ex. 5
minute , so if we want the job to be done in 1 (one ) minute, so we should
run pgm1( to read record 1-200),pgm2 ( to read record 201-400)  and so on
until pgm5( to read 801-1000) and all the programs should be run on the same
time .
Would you be so kind share the experience .
Thank you
Regards,
Sas

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