Re: USRSPC vs. Local data

["Alan E." <steelville@xxxxxxxxxxx>]

That's what I figured, although if not in QTEMP, user spaces
would seem to have object locking and authority
considerations. That said, it seems like no matter what,
straight array processing
(as in Rcd1) has always seemed to me like a crawler (slow
slow) compared to almost anything else.

But that also said, seems to me that outside the lookup
opcode and MOVEA and such, user spaces are much more
flexible. You don't have to used up all the memory for
defining a 512-length and 10,000-dimension array to cover
all the situations, while avoiding the overhead of the
dynamically allocated arrays at the same time.

That also said, coding for arrrays is quicker sometimes.

- Alan


----- Original Message -----
From: "Bob cozzi" <cozzi@xxxxxxxxx>
To: "'RPG programming on the AS400 / iSeries'"
<rpg400-l@xxxxxxxxxxxx>
Sent: Saturday, August 30, 2003 9:39 PM
Subject: RE: USRSPC vs. Local data


| The short answer is it depends, but it may be faster in
some situations, and
| slower in others. I use that technique a lot (user spaces
for virtual
| memory) and have no issues with performance.
|
|
| Bob Cozzi
| Cozzi Consulting
| www.rpgiv.com
|
|
| -----Original Message-----
| From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx]
| On Behalf Of Carlos Kozuszko
| Sent: Saturday, August 30, 2003 6:51 AM
| To: rpg400 (E-mail)
| Subject: USRSPC vs. Local data
|
|
| Are there any access speed differences processing data
from a user space
| compared with local data ?
|
| D  Rcd1           S             82    DIM(300)
| D  Rcd2           S             82    DIM(300)
BASED(pRcd2) // Pointer to
| a userspace
|
| Lets say i want to load 300 records in an array and sort
it, sorting Rcd2
| would be slower than Rcd1 ?
|
| Im considering storing the data in a userspace, becouse
there are chances
| that the same dataset (300 records per dataset) need to be
reprocessed
| again, storing a userspace in qtemp by each recordset
would avoid to re-read
| and sort the records.
| What im really wondering is if the access to the data
stored in a user space
| is a plain memory access just like accesing any other
variable, if so, i
| think my new approach is better that the current one.
|
| Any thoughts ?
|
| Carlos Kozuszko
|
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