Issues with Buffers

[Former Member]

HI all,

I am testing a Z program for performance,

I copied the Z program in to another Y program and did performance tuning.

when i am running in background first Z program and then Y program

Y perogram is giving less time.

and if I am testing in the reverse order, testing Y program frst and then Z program

Z program is giving good results.

1:How can we measure execution time for any program.

2: How to handle buffers? (when the first time program is executed where the data bufered like SAP buffer or Application server buffer or Presentation server buffer.)

[Former Member]

HI all,

I am testing a Z program for performance,

I copied the Z program in to another Y program and did performance tuning.

when i am running in background first Z program and then Y program

Y perogram is giving less time.

and if I am testing in the reverse order, testing Y program frst and then Z program

Z program is giving good results.

1:How can we measure execution time for any program.

2: How to handle buffers? (when the first time program is executed where the data bufered like SAP buffer or Application server buffer or Presentation server buffer.)

[Former Member]

the effect of the buffers (table buffer mainly) should become visible only between the really first execution and the second execution.

So how much time is between your actual measurements.

And please repeat your measurements several times, then you learn how statistical variation you have

and what is really an effect.

You optimize the repeated execution not the very first one.

Siegfried

[Former Member]

thank you