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David FOXWELL wrote:
If we have 50 people using the same interactive program that weighs
40 Mb, made up of many modules bound by copy and no service programs,
are there 50 copies of that program in activated or is it shared ?
Can we imagine any performance differences with the use of service
programs instead of modules?
If it's the same program object (same library & program), then all 50 users will be using the same EXECUTABLE code ... but they will have their own data space.
Service programs come into their own when you have multiple unique programs referencing the same procedure in the same module ... then you can have a single copy of the procedure in a module in a service program and all programs use the same code. Plus, if you need to change the procedure, all you have to do is change it in one place and all programs will use the updated code.
I'm not 100% sure, but I think service programs are just as reentrant as regular programs.
david
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