On Saturday 05 October 2002 10.51, you wrote: > On Sat, Oct 05, 2002 at 09:12:31 +0200, Anders Torger wrote: > > Although I have disabled the use of the dlopen()'d modules (for > > debugging this problem), running the init code in the beginning > > causes the convolution loop to take 109ms instead of 62ms. > > Just a guess, but it could be cache related. I've had exteme > performance changes when things end up just fitting in the cache or > just not.
Yes, it probably is in some way (to my knowledge, this only occurs when I have quite large blocks to process), however, the task and data is the same for both cases, the difference is that some unrelated code has been run in a dlopen'd module before it. The work-around I'm doing now is to fork the convolution process early, before any dlopen stuff, it makes the initialisation much more cumbersome, but the performance problem goes away. /Anders Torger
