Re: perfomance question

[Vernon Hamberg <vhamberg@xxxxxxxxx>]

Heba

I/O is the main bottleneck on the 400. One thing that can help is to change
unused logical files to MAINT(*DLY). If you have a lot of logical files,
this will reduce I/O needed to also write to these logical files. When the
run is over, restore the settings.

This technique cannot be used on uniquely keyed logical files.

Having multiple jobs could help. Depends - do you have multiple processors?
Even just more tasks will maybe take more CPU, while putting the I/O
requests out there. Very generally, you want to use all the CPU you can
while waiting for I/O.

Is the 3rd-party module part of a package? Do you have any control over
what it does, or how? If it's a utility, maybe you're better off rolling
your own.

For max performance, generally avoid SQL - too much overhead - and go for
native record I/O. SQL is convenient for development but can be slower.

Vern

At 12:32 PM 10/12/02 +0000, you wrote:
> Hi All,
>
> I have a performance question, one of our interface systems should put put a
> large number of transactions into the as/400 machine and these transactions
> should be processed within a certain limit of time.
>
> what we have developed here in-house is just a program that runs as a
> prestarted job every 30min, this program calls another third party module to
> record the transactions...there are some cases that we need to performa lot
> of payment transactions(at the end of month for example) and due to this
> third party module takes a considerable time because it writes a lot of
> records in many files we have a performance slow down due to the IO.
>
> I am thinking about converting the prestart job to a DB trigger...
> else can we do? If I spawn 4 jobs instead of one to process the payment does
> it have any positive effect? Any H/W or S/W recommendations to speed up the
> processing?
>
> Thanks in advance for any help
> Heba
>
>
>
>
>
>
>
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