cpu vs memory

[IonCurici]

Need an advice on best solution - whether to load memory or cpu.
Subj: script performing calculations based on the user input (2 mandatory + 3 optional elements) and outputting a result consisting of 48 to 144 elements.


solution 1
page1:
<form method="post" action="page2">

page2:
calculations are made based on post data, result returned as a big array and written to $_SESSION.
page redirected to page3.

page3:
displaying result by reading $_SESSION.
! data in $_SESSION are kept


solution 2
page1:
<form method="post" action="page2">

page2:
input data is written to $_SESSION (for further use)
page redirected to page3.

page3:
calculations are made based on $_SESSION.
displaying result.
! each time the page is reloaded the calculation script will execute once more.

any advice?

 

[ingresman]

Session is held in filestore not memory - is that any help ?.
It would be usefull to see how much actual memory you use at run time, it doesn't look like you have that much really