RE: Multi-processor machines.

["Svensson, Joakim" <joakim.svensson@xxxxxxxxxxxx>]

One years ago I was asked to look at the performance of a normal
online-application. I made some measurements with Performance Monitor
and used this data to predict the performance in a larger AS/400. No
matter the size of the AS/400 the end-user responstimes was the same.
The only thing that changed as I changed CPU-model, main storage and
DASD was the CPU utilization getting lower and lower. On a 530 the CPU
util was about 3%.
I started to look at the RPG-code, and soon I realized that the
application was built with one program per screen. This can be regarded
as a very modular and flexible model, but the problem was that every
CALL was directly followed by a FREE. To make things worse, every
program made explicit OPEN and CLOSE on every file, with no central
opening of files.

Conclusion: Every computer - regardless of hardware-features - is
waiting at the same speed.

/Joakim

Joakim Svensson
IT-Architect
Cap Gemini, Sweden

>-----Original Message-----
>Sometimes the best way to make it run faster is to fix the software, not the
>hardware.
>
>Peter Lunde
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