Philip Semanchuk wrote: > > On Jun 23, 2009, at 9:51 AM, Rolf Wester wrote: > >> Hi, >> >> I have a C++ program that I would like to steer using Python. I made the >> wrapper using swig and linked the code (without the main function) into >> a shared object. My Python script loads the extension and calls a >> function of the C-extension, the rest runs entirely within the >> C-extension. For comparison I compiled the code including the main >> function with the same compilation options and linked all into an exe. >> The main function of the exe calls the same function as my Python script >> does. Surprisingly the code in the Python C-extension runs twice as long >> as the same code in the exe. Does anyone know what could be the reason >> for this behaviour? > > If the runtime of the C/C++ code is short, the time spent initializing > the Python interpreter might have a big impact on the runtime of the > Python version. > > The runtime is about 2.5 sec and 5.0 sec respectively. I not only use the time command to measure the time consumed but I also measure the time within the C-code using clock() and get similar result. So the Python startup time is not the reason for the runtime difference I found. Thank you anyway.
Rolf -- http://mail.python.org/mailman/listinfo/python-list
