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On 26-Jun-09, at 11:08 AM, midrange-l-request@xxxxxxxxxxxx wrote:
Now, these two modules are bound by copy to virtually ALL our
modules. With DSPMOD export and imports I calculate 1491 modules
that import from both these modules. Does that mean that the total
disk space occupied by these modules is around 1491 times the total
of the two modules, ie 2925318144? I think that says nearly 3Gb.
Does that mean I'd gain around 2.8Gb disk space with a service
program?
Or am I just being na?ve as it's quitting time on a Friday?
Yes it does.
But more importantly, it means that when any two of these programs are
in use at the same time (i.e. both active in the stack) you are using
twice the memory _per_user_ - if five programs are in use that is five
times the memory. Multiply that by your number of active users and
you'll see that your memory usage (and therefore disk in terms of
paging storage) are also significantly affected by this practice.
Service programs were invented to avoid the kind of scenario that your
current practice creates. You are wasting significant disk space and
significant memory by binding by copy instead of by reference. And
you gain little or nothing.
Jon Paris
www.Partner400.com
www.SystemiDeveloper.com
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