But do you try to "load all" that same subfile? I think that was the
original point to this line of troubleshooting. If you are only loading
the page asked for and then the next page as wanted, and letting the
system handle to roll back, this is fine. If you are saying its a page +1
subfile and then loading 3200 records it may affect the time for the
initial load. This has been eliminated, but it was definitely suspect at
the time. T
From:
Bryce Martin <BMartin@xxxxxxxxxxxx>
To:
RPG programming on the IBM i / System i <rpg400-l@xxxxxxxxxxxx>
Date:
01/19/2011 08:24 AM
Subject:
RE: Subfile initial load very slow
Sent by:
rpg400-l-bounces@xxxxxxxxxxxx
Sharon,
It may be the problem, but my suspicion is elsewhere. I have NEVER had a
SFLSIZ that was more than 1 more than the SFLPAG. And I have NEVER seen
this type of issue. My guess is more of a datebase IO issue, files being
opened, program not in memory, etc etc. You might be right, but from my
personal experience, I don't think that's it.
Thanks
Bryce Martin
Programmer/Analyst I
570-546-4777
"Wintermute, Sharon" <Sharon.Wintermute@xxxxxxx>
Sent by: rpg400-l-bounces@xxxxxxxxxxxx
01/18/2011 05:12 PM
Please respond to
RPG programming on the IBM i / System i <rpg400-l@xxxxxxxxxxxx>
To
"RPG programming on the IBM i / System i" <rpg400-l@xxxxxxxxxxxx>
cc
Subject
RE: Subfile initial load very slow
Do you understand that by the system having to reallocate the subfile to
get it to 500 records from a definition (SFLSIZ) of 13, it is going to
take some time? That is 39 times it has to reallocate the subfile.
This is probably your problem.
-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of Andy Devries
Sent: Tuesday, January 18, 2011 4:08 PM
To: RPG programming on the IBM i / System i
Subject: RE: Subfile initial load very slow
I hope this is what you are asking. When I looked at the job when it
completed (loading and displaying the subfile). I read 4 different data
base files to produce one subfile record. The actual subfile ends up
containing just over 500 records.
After the initial load, it is possible that the subfile could be
reloaded - the file is static enough that new records would not be
added.
-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of Gary Thompson
Sent: Tuesday, January 18, 2011 1:43 PM
To: RPG programming on the IBM i / System i
Subject: RE: Subfile initial load very slow
More questions to focus on the reason the initial load seems so much
slower:
1) Do you know about how many records are read from the database
to load one subfile record?
2) After initial load, is the subfile reloaded, or are new
records
added to existing subfile records?
By tracking program i-o, you might find that performance is not changing
as much as the amout of program i-o is changing
In my experience, subfile i-o is relatively fast compared to database
i-o
Andy Devries <andyd@xxxxxxx>
Sent by: rpg400-l-bounces@xxxxxxxxxxxx
01/18/2011 02:21 PM
Please respond to
RPG programming on the IBM i / System i <rpg400-l@xxxxxxxxxxxx>
To
RPG programming on the IBM i / System i <rpg400-l@xxxxxxxxxxxx>
cc
Subject
RE: Subfile initial load very slow
Thanks Paul - The program is a simple call from a CL - Displays the
subfile screen with input fields. Once <ENTER> is hit the subfile build
happens. It's the time between the build and redisplay that can be very
long. Not all 3000+ records are part of the subfile.
-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx]
On Behalf Of paultherrien@xxxxxxxxxxxxxxxxxx
Sent: Tuesday, January 18, 2011 12:59 PM
To: 'RPG programming on the IBM i / System i'
Subject: RE: Subfile initial load very slow
Is there anything else occurring when the program initializes? It
doesn't
sound like a subfile issue exactly.
Since it only occurs when the program is first loaded it indicates that
there is some initialization going on which may or may not have anything
to
do with the subfile.
Paul Therrien
Andeco Software, LLC
932 Saint Johns Dr
Maryville, TN 37801
225-229-2491
paultherrien@xxxxxxxxxxxxxxxxxx
www.andecosoftware.com
-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx]
On Behalf Of Andy Devries
Sent: Tuesday, January 18, 2011 2:30 PM
To: rpg400-l@xxxxxxxxxxxx
Subject: Subfile initial load very slow
I've been scratching my head about this one for some time. This is an
RPG400
program. I have a subfile that is loaded from a file that only contains
3200 records. The initial load takes a long time (over a minute). In
subsequent calls to the same program, it responds much better (2-3
seconds).
I've gone into debug - doesn't seem to hang at any location. I've
watched
it process (WRKACTJOB) and it seems to do the same process. I have
looked
at locked records - doesn't seem to be a problem. Can anyone suggest
other
techniques for debugging this problem. As you can imagine, the users
don't
like the long delay.
Andy
midrange.com
