RE: USRSPC vs. Local data

["Christen, Duane J." <dchristen@xxxxxxxxxxxxx>]

Carlos;
I would make the assumption that the processing is occuring in main-store
with the user space. But as with all main-store on the iSeries it can be
paged to disk when not in use, even allocated storage, like Rcd1, can be
paged to disk if the system needs the memory and it hasn't been used
recently. I would reccomend doing some testing on each approch and see which
option is faster. 

Remember that qtemp only last as long as the job, so if you want to save the
data to possabily be re-used it must be done in the same job, otherwise
write the user space to a file or copy it to another library before the job
ends.

Duane


-----Original Message-----
From: Carlos Kozuszko [mailto:tidesarrollo@xxxxxxxxxxxxxxxxxxxxxx]
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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