[hatari-devel] New CPU, MacOsX Build

[Nicolas Pomarède]

Le 30/01/2011 12:32, Jerome Vernet a écrit :

> I just tried in windowed mode. Under MacOsX, there is an huge overhead
> is this mode. But, by this time where anybody have multicore CPU, that's
> may be a good idea to try a multithreaded implementation of the DSP and
> Math CPU ?
>

Hi,

I think this would just make things worse, because we would need extreme 
synchronisation between the threads to be sure DSP and CPU are really 
running at compatible speed. And obtaining the equivalent of cycle 
precision with thread seems quite hard.

So all the sync problems we have now would be even greater and would be 
spread among many independant threads (requiring locking, semaphore and 
all the usual mechanismes, and making it harder to debug).

For me there's no doubt that maximum precision can only be obtained by 
having only one thread that manages the different components by 
allocating a number of cycle to each one (and due to the overhead of 
threads handling / more tasks switching, it's quite possible multi 
thread would be also slower).

Nicolas