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It depends. I'm working on a project that uses a lot of C & C++ code for convenience and speed, (but especially speed) and I would say, minimize the amount of interface code period.

Interface code is overhead. Extending the API in C to match exactly what you need and then wrapping the new API in XS will probably give you the "best" results. If you're going for speed you need as few cross-language calls as possible.

As an example, Audio::LADSPA wouldn't be able to generate sound in realtime if you needed a method call for each plugin and frame. That's why it takes buffers of floats and loops through them in C. Looping through half a million scalars a second in perl tends to slow your program down, but C will go through half a million floats in no time. That means it's probably better to write some "higher level" code that does the looping for you, so you only need 1 perl call for a batch of X floats.

Another thing I've noticed is that SWIG's OO interface code is horribly slow (especially when getting/setting properties). That's usually only an issue when the API doesn't really match what you're trying to do, but still it's something to be mindful of.

Cheers,
Joost.


In reply to Re^3: $perl_extension ? require SWIG : require XS; (XS--) by Joost
in thread $perl_extension ? require SWIG : require XS; by shonorio

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