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  1.  Home
  2. RPG400-L
  3. January 2011

Re: Subfile initial load very slow

Andy

Second time loading fast is so surprise at all, the system buffers so much
IO data these days. Even FNDSTRPDM runs 10 times faster the second time
over the same set of members.

Sharon had a valid point about "how many record were read to product 3200
subfile entries". I remember once finding a loop that was busted and read
the whole file to lead each subfile record (!!). It lasted quite a while,
till the file started getting "large".

Stu




On Tue, Jan 18, 2011 at 16:49, Wintermute, Sharon <Sharon.Wintermute@xxxxxxx
wrote:

Since you have changed the sflsiz and eliminated it, look and see how
much I/O is happening between when you call the CL and display the
subfile. How many records did it read to create how many subfile
records?

It can re-display the same thing really quick if the data is already
loaded in the buffers.

Sharon


-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of Andy Devries
Sent: Tuesday, January 18, 2011 4:45 PM
To: RPG programming on the IBM i / System i
Subject: RE: Subfile initial load very slow

Thanks Sharon - I tried changing the sflsiz to 1000. It still takes a
lot of time to load the subfile the first time thru. IE I call the CL
that displays the subfile screen, I hit enter and wait. After it has
loaded I exit the program, call the same CL and hit enter - 2 or 3
seconds and I have the subfile. If it took over a minute every time, I
would probably start from scratch. The fact that it re-displays so
quickly is the head scratcher.

-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of Wintermute, Sharon
Sent: Tuesday, January 18, 2011 2:12 PM
To: RPG programming on the IBM i / System i
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

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