[linux-audio-dev] Performance problems caused by dlopen()

[Anders Torger]

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