Re: User Space or Data Queue or PF or IFS -- RPG400-L

Hi John,

While waiting for your reply to Hans Boldt's question, I thought I just
point out that a physical file accessed by relative record# will perform
better than the IFS, so I'm unclear on why you'd prefer the IFS.

Curious,
Peter Dow
Dow Software Services, Inc.
909 793-9050 voice
909 793-4480 fax
909 522-3214 cell

----- Original Message ----- 
From: "John Brandt Sr." <pgmr@xxxxxxxxxxxxxxx>
To: "'RPG programming on the AS400 / iSeries'" <rpg400-l@xxxxxxxxxxxx>
Sent: Monday, November 03, 2003 12:17 PM
Subject: RE: User Space or Data Queue or PF or IFS


> Peter:
> I am reading off of a socket. I parse the data based on
> the packet size coming off of the socket and
> write it to the user space in 32K increments.
> I am writing to be backwards compatible back to 4.5
> so if they retrieve a multiple gig file,
> I have to be able to handle it.
> I can do the calculations to figure it out in records.
> I was just thinking I didn't want to use the IFS
> because it would take a performance hit.
> John
>
>
> -----Original Message-----
> From: Peter Dow [mailto:maillist@xxxxxxxxxxxxxxx]
> Sent: Monday, November 03, 2003 1:21 PM
> To: RPG programming on the AS400 / iSeries
> Subject: Re: User Space or Data Queue or PF or IFS
>
>
> Hi John,
>
> When you say you're accessing the 32K chunks by address, do you mean
chunk#
> or something?  If you split each chunk into two physical file records,
> calculation of the rrn of the chunks would be pretty simple -- rrn1 =
chunk#
> * 2 - 1, rrn2 = chunk# * 2.  I guess what I'm saying is that calculating
the
> record you want is not too big a deal.  If speed is an issue, and you
think
> a multiply would take too long, then try rrn1 = chunk# + chunk# - 1.
>
> hth,
> Peter Dow
> Dow Software Services, Inc.
> 909 793-9050 voice
> 909 793-4480 fax
> 909 522-3214 cell
>
> ----- Original Message ----- 
> From: "John Brandt Sr." <pgmr@xxxxxxxxxxxxxxx>
> To: "'RPG programming on the AS400 / iSeries'" <rpg400-l@xxxxxxxxxxxx>
> Sent: Monday, November 03, 2003 10:19 AM
> Subject: User Space or Data Queue or PF or IFS
>
>
> > I have written a utility to retrieve records from an SQL server.
> > I used User Space to store the data returned from the server.
> > The problem is that the user space is restricted to 16MB.
> > In order to break this limitation, I need to move to another storage
> method.
> > I am putting data directly off a socket in 32K chunks and accessing it
by
> > address.
> > Any method besides the IFS would cause me to have to calculate the
record
> I
> > want every I/O, although a Data Queue would work because I can use the
32K
> > chunks and just divide my offset by 32767 to get the record that I want.
> (I
> > will still have some overlap, but I can deal with that)
> >
> > Any suggestions?
> > John Brandt
> > iStudio400.com
> >
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