Re: data pointer vs userspace

["Richard ECUYER" <recuyer@xxxxxxx>]

hi i had like the same requirements for some cgi, and i use userspace with
auto-increment.
The iseris part of the consit of stack of call (simulated a green screnn
input) with simple screen or subfile, in each pgm i use some of the data
gotten from the previous one.

After about 20 call to different pgm, i have a full structure (qualified
like list api by external DS) an send/receive about 30Ko of data for each
transcation.

It take about 2 seconds, to make all the process (read stdin, process, write
stdout, client process and display)
I use 2 userspaces one for work another to store in qtemp so after job done
no manage of  userspaces to do.

The initial idea was, use one pgm for both interactive and batch process.
Hope that it can give you an idea.

----- Original Message ----- 
From: "Larry Ducie" <larry_ducie@xxxxxxxxxxx>
To: <rpg400-l@xxxxxxxxxxxx>
Sent: Thursday, March 17, 2005 5:42 PM
Subject: data pointer vs userspace


> Hi,
>
> I'm writing some code to generate xml data, and it is stored,
provisionally,
> on a pointer.
>
> My question is: Which is the best place to hold the data - a pointer
within
> a userspace or a data pointer within the program?
>
> I will need to be able to generate data of varying sizes, from 100 bytes
to
> 100k. However, each instance of the app will generate data of a consistent
> size: Instance 1 will generate 100 byte xml (inventory transactions),
> instance 2 will generate 32-64k xml (picktickets), etc...
>
> I know I can allocate up to 16mb of memory to a data pointer, and similar
> sizes on a userspace. BUT what scenarios favour one over the other? Which
is
> fastest to allocate? Which is fastest to reallocate? Which is the most
> flexible? Which is the most stable/reliable/resilient?
>
> I know I can auto-extend a userspace, is this better than %realloc on a
data
> pointer? I also know I can %realloc less memory to a data pointer, can you
> auto-decrease a userspace? Is it actually worthwhile reallocating less
> memory to a pointer, or should I only change it upwards?
>
> Finally, I would not expect the memory I allocate to persist once the job
> has finished.
>
> Again, your wise words are most welcome.
>
> TIA
>
> Larry Ducie
>
>
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