为什么第一次调用Matlab DLL比后续调用花费的时间长？

Question

I call from my C++ code a DLL that was written in MATLAB. I observe a strange effect: the first call takes much more time that the next calls. It takes 3-4 times more. Is it normal? Is it possible to do something with it?

Answer 1

Yes that is normal, the delay comes from starting up the MATLAB Runtime Compiler . This is what runs the MATLAB code from the dll that you created through MATLAB. The initial startup cannot be avoided AFAIK, but you can maybe add a dummy call to the DLL when your application begins in order to avoid the "cost" later.