Archives week 17 of 2009

For those who didn't see the presentation at PyCon:

• do not use the profile module with python 2.x
• use the cProfile module (or hotshot if you're on < 2.4)

the profile module has extremely high overhead and will produce results that would have you doing the wrong thing if you were to believe them.  See ...

There's always going to be lots more work to get done, but I think I'm pretty much okay with where OpenGL_accelerate is for now.  There's now a C-level API for format handlers, so that Cython modules can be written that pretty much do a cast and a dereference to get values, rather than doing lots ...

So with a fairly extensive set of Cython wrappers, running a fairly large, heavy VRML world with transparencies and all the rest, I see a noticeable, but modest, speedup.

The world I'm testing on goes from ~12.8fps (avg) to 15.5fps (avg), that's a nice 20% speedup.  On average OpenGLContext now spends around 20% of rendering ...

I've been writing accelerator modules for PyOpenGL for the last two days.  I think I've got to a reasonably comfortable point.  I've got a Numpy FormatHandler and an ArrayDatatype written.  With some judicious use of cdef'd typed self variables there's a lot of overhead eliminated from the wrapper operation.  To make it really fast, however, ...