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How to increase speed of a function in a dll?

Posted on 2004-09-21
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Last Modified: 2010-04-15
Hi,
I have to make a program which has to check a HUGE list of numbers (check if they are prime).
I want to write the "check"-function in a dll, so that it's much easier to use it later.
Is it true that it decreases the speed of your program when you write a function in a dll?
If so, what can I do about it ??
Is it possible to load the entire function of the dll into memory, so that the decrease of speed dissapears ?

Thanks in advance.
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Question by:kip_tok
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Jaime Olivares earned 240 total points
ID: 12114055
No, that is not so true:
DLL functions are slower to load, when you call for the first time, second time (in the same session), will almost as fast as an application own function. Even more, for a complex, long time function, loading time is not significative, because once loaded (with a delay maybe) function will run exactly as fast as a local function.
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by:kip_tok
ID: 12114289
Thanks a lot.
btw:
If I use _fastcall, would that raise the speed of such a function?
And I suppose that dynamic/static linking of the dll doesn't makes any difference (except maybe for the delay); is this correct ?
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Expert Comment

by:Jaime Olivares
ID: 12114392
Yes, as I told you, once loaded, function will run with same speed as any other.
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