On Wednesday 18 February 2009 03:45:56 Alan Grimes wrote: > Take my advice, don't get started on profiling and optimization unless > you have several days worth of time to waste. =P > > The biggest CPU sucker in ktechlab is the linear algebra engine. The > reason it gets called so much is that non-linear things such as > transistors need to iterate in order to converge on their instantaneous > DC conditions... I found several ways to reduce the number of times > QMatrix[] is called... GCC doesn't seem to be inlining it, that could > also be a fairly substantial boost. The biggest gain was to convert a > copy (double) loop into a memcpy, that was a very substantial gain! > > The most obvious way to get even more out of it is to convert to use > liboil... =P What about using eigen2? The developers just released an interesting interview on the dot. http://dot.kde.org/2009/02/16/interview-eigen-developers-20-release
Since it is in kdesupport, we don't need any external dependencies here. (We technically don't even link against any shared library, since eigen2 are just header files.) > I fixed a few memory leaks too but a substantial number of trivial leaks > remain, (I added comments in the code to point them out...) > > > I would like to set up a design meeting sometime next week where people > can argue over what direction the KDE4 port should go... (even though > kde4 looks like the biggest regression in open source history...) +1 from me. We just need to get our time-zones in sync ;) I am GMT+1, Zoltan is GMT+2, I think. bye then julian
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