Re: I think I need multi-threading but I'm only on V5R4M5

[Scott Klement <rpg400-l@xxxxxxxxxxxxxxxx>]

Hi Bryce,

The spawn() API will allow you to create "child jobs" that can be used 
to do your searching.  They are _jobs_ (not threads) and will have the 
start-up overhead associated with creating a new job (just as SBMJOB 
does) but the jobs will be able to communicate back to with your master 
job via pipes (or data queues, or whatever) and therefore you can use it 
to compile your master list if you like.

I have no idea how well/poor that would perform.

You could also code your routine in a thread-capable language like C or 
Java instead of using RPG. Then you could use multi-threaded support.

Though, I find myself wondering if it'd make much difference in 
performance?  The only way to know, I guess, is to test it.


On 10/5/2010 12:43 PM, Bryce Martin wrote:
> Well I have come upon a project where I think I need multi-threading in
> RPGLE but I am only on V5R4M5.
>
> Here is the scenario...
> We have a file that we need to search.  There are 7 fields in each record
> that can be searched.  As few as 1 or as many as all 7 can be specified.
> What I've done is broken out these fields into Key,Value pairs for faster
> searching.  By keeping each searchable field as a seperate table ask the
> Key and having the key field from the main file as the Value.  I will then
> return all matching values to the main search program.
>
> My basic structure would be something like....
>
> if parm1<>  '';
>   searchfield1()
> endif;
>
> if parm2<>  '';
>   searchfield2();
> endif;
>
> ....
>
> if parm7<>  '';
>   searchfield7();
> endif;
>
>
> Since each of these searches are on different files I want to be able to
> do them in parallel to speed it up.  Is there a way to do this without
> doing a sbmjob.  I can't do the sbmjob since I need to gather the results
> of each searchfield procedure and then compile a master list.
>
> Any idea will be appreciated.
>
>
> Thanks
> Bryce Martin
> Programmer/Analyst I
> 570-546-4777
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