We wait 175x slower, apparently (Benchmarks are fun ways to waste time...)


User asked me to look at the POGL/PyOpenGL benchmark thing again. So I added a few cProfile calls to the silly thing so I could actually see what's going on (why not just use profiling to start with? Why create opaque graphs of pointless data when you can have a full breakdown of where the time is spent? Sigh. Batteries included.)

Anyway, about 25% of overhead is low-hanging fruit, mostly the error-checking code (as expected), also some of the ctypes-array handling stuff (again, as expected). Approximately 50% of runtime in the benchmark is in the glFlush call... i.e. waiting for sync/transfer. Another 2% is just in calls to time.time. Something is wonky in there.

The benchmark is so poorly structured I just don't care enough to try to fix it or track down the glFlush issue with it. What is with all the global variables and while loops? Ick! I felt dirty just trying to fit the profiling code in there.

Oh, there's a cute section on why you should use Perl instead of Python at the end of their page... it's a hoot! Three different bullet points on the print statement as reasons to choose a language for 3D graphics. Dudes, relax, if someone "must use Python for OpenGL" ;) it's probably for reasons more critical than print statement formatting ;) :) . If you guys want to claim the speed crown in OpenGL bindings; feel free, I can take it; but don't beat up on the poor little print statement :) .

Comments

  1. Brandon

    Brandon on 06/05/2007 9:30 a.m. #


    I can't tell from what you wrote ... were you going to tackle the glFlush problem then?

  2. Mike Fletcher

    Mike Fletcher on 06/05/2007 1:35 p.m. #


    Wasn't intending to tackle it, no. If it's a real wait then it's a problem with the OpenGL implementation (i.e. it's taking that long for the OpenGL implementation to pass the data to the server, nothing to do with PyOpenGL). If it's just a usage issue, it's a bug in the benchmark, and that code is just too messy to want to spend my few spare hours on it.

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