RE: User Space extent

Oh, if that's what you're trying to do... make bsearch faster than CHAIN,
then consider using a User Index. No such limitation exist for it, and you
can do a Find Index Entry (effectively a CHAIN but without the I/O overhead)
nearly as easily as a CHAIN, and certainly as easy as or easier than
bsearch.


-Bob Cozzi
www.RPGxTools.com
RPG xTools - Enjoy programming again.


-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx [mailto:rpg400-l-bounces@xxxxxxxxxxxx]
On Behalf Of Tony Carolla
Sent: Wednesday, December 28, 2005 10:53 AM
To: RPG programming on the AS400 / iSeries
Subject: Re: User Space extent

On 12/28/05, Bob Cozzi <cozzi@xxxxxxxxx> wrote:
>
> First, switch to an IFS file and use large file support open64() and
> you'll
> solve your problem with 16MB. I thought you were reading/writing >16MB at
> a
> time. For a "throughout the day" routine should consider an IFS file as
> the
> solution.


The entries are stored in a PF throught the day.  At night, a lengthy update
procedure runs, and this file was used, via SETLL, while reading through
several files to determine if an update happened.  I thought that loading a
user space with the entries, then firing off bsearch() rather than SETLLing
each time would save time.  I am still juggling ideas for making it quick,
yet simple.

Whatever the final solution is, I would like to thank you people on the
list, because I have learned most of these techniques from you.  Years ago,
I would have just told mgt to buy a faster box ;-)


Second, the reason there is a 16MB limit that cannot be changed is because
> that code is so widely tide into OS/400 in so many places, and so
> optimized
> that if they changed it, it could break the OS.
>
> Back in the 1970s when they did this, nobody thought that one day most of
> the U.S. population would be throwing away the 16MB SD memory cards that
> came with their digital cameras, because they were too small.
> Although, now that I think about it... why was it that somebody said
> "Pointers are always too small so let's make them bigger than we'll ever
> need" and yet decided that 16MB was more memory that they would ever need.
> <g>
>
>
> -Bob Cozzi
> www.RPGxTools.com
> RPG xTools - Enjoy programming again.
>
>
> -----Original Message-----
> From: rpg400-l-bounces@xxxxxxxxxxxx [mailto:rpg400-l-bounces@xxxxxxxxxxxx]
> On Behalf Of Tony Carolla
> Sent: Wednesday, December 28, 2005 10:14 AM
> To: RPG programming on the AS400 / iSeries
> Subject: Re: User Space extent
>
> The user space will contain updated account numbers (3A + 9P 0, combined
> into a 12A) that are collected from journal entries throughout the
> day.  The
> number of elements can climb to 400k-500k a day (cleared out each night),
> so
> I will rarely hit the ceiling (except maybe after a three-day
> weekend).  The
> reason I hit the ceiling was due to a bug I created while writing the
> program, but I wanted to know if there was a way to do the impossible, an
> 'insider trick', to bypass that 16MB limit.
>
> Interesting... It piques my curiousity why the 16MB 'knob' can't just be
> turned up... That really bytes (three times no less ;-)
>
> On 12/27/05, albartell <albartell@xxxxxxxxx> wrote:
> >
> > Just curious, what are you placing in the user space that is exceeding
> > 16MB?
> >
> >
> >
> > Aaron Bartell
> >
> >
> > -----Original Message-----
> > From: rpg400-l-bounces@xxxxxxxxxxxx [mailto:
> rpg400-l-bounces@xxxxxxxxxxxx]
> > On Behalf Of Tony Carolla
> > Sent: Friday, December 23, 2005 3:52 PM
> > To: RPG programming on the AS400 / iSeries
> > Subject: User Space extent
> >
> > Merry Christmas again!  May the Chrismas cheer burn in deeper than the
> > screen from a 3196 console!
> >
> > I am creating a user space, set to auto-extend, and in a loop, placing a
> > 12
> > alpha value in the user space, incrementing the pointer, etc.  But as
> soon
> > as I get to 16MB, it crashes.  Is there any way to make a user space
> > larger
> > than 16mb?  If not, I guess I will have to use memory directly, but not
> > sure
> > if I want to do that...
> >
> > --
> > "Enter any 11-digit prime number to continue..."
> > "In Hebrew SQL, how do you use right() and left()?..." - Random Thought
> > "If
> > all you have is a hammer, all your problems begin to look like nails"
> > --
> > This is the RPG programming on the AS400 / iSeries (RPG400-L) mailing
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>
> --
> "Enter any 11-digit prime number to continue..."
> "In Hebrew SQL, how do you use right() and left()?..." - Random Thought
> "If all you have is a hammer, all your problems begin to look like nails"
> --
> This is the RPG programming on the AS400 / iSeries (RPG400-L) mailing list
> To post a message email: RPG400-L@xxxxxxxxxxxx
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>


--
"Enter any 11-digit prime number to continue..."
"In Hebrew SQL, how do you use right() and left()?..." - Random Thought
"If all you have is a hammer, all your problems begin to look like nails"