Re: FNDSTRPDM memory enhancement

[Vern Hamberg <vhamberg@xxxxxxxxxxxxxxxxxxxxxxxxx>]

Craig, have you looked at the SETOBJACC command? It is the fastest way to 
get objects into main memory. You can (need to?) specify members for files. 
Your loop could use this on the members listed.

Look at the help text on this command, esp. the opening section, for hints 
on making these things persistent in main memory. Thing is, you need enough 
space that is not needed for running processes.

The replaced object thing is a little different - there's probably some 
reference to a memory location in your job, and if a program is in use 
while it is recreated, that reference is changed to the copy in QRPLOBJ.

Once an object is in memory, it is available to all running processes, even 
if in a different pool.

If the member is small enough (probably < 4k), 1 read is enough to bring it 
all in. This depends on things like expert cache, which can use larger IO 
block sizes for sequential file access, which could be the pattern for 
source members. But the normal block size is one memory page, or 4096 bytes.

HTH

Vern

BTW, you still might be crazy. Just because a person is paranoid, it 
doesn't mean they're not really after you.

At 11:34 AM 10/10/2003 -0500, you wrote:
-snip-
> If you open each member in an RPG program, do a single read, and
> close, I think that places the entire member in memory.

-snip-

> Every morning a system scan is initiated in batch that basically does a
> DSPFD for all common source physical files to outfiles.  I was thinking of
> taking these resulting outfiles and submitting jobs to batch for each
> library processed for each source file.

-snip-

> Should I do the open, 1 read, close of every source member in batch jobs (1
> library per job)?  Any system issues that might come up in doing this?
> Am I correct in thinking of this as members stored in memory?  Is this the
> same thing as when a program is replaced while someone is using it and they
> are running the version still stored in memory until they exit?
> Am I crazy?
>
> Thanks,
> Craig Strong