[XviD-devel] Multithreaded ME

[Christoph Lampert]

> > Hi,
> >
> > finally, my dual-CPU ME is faster than single threaded, at least in high
> > quality modes. I'll do some cleanup and then commit one day to CVS.
> > It will be disabled by default, only -D_SMP will activate it.
> 
> great, btw: how much faster is the dual-cpu mode now?

Almost 5% !!!

No, honestly, it's only ME and for small images (<CIF) it's still too
slow, but it's better than nothing, when I slowed things down by 
working on 2 CPUs in parallel. I didn't optimize for speed, yet, 
because there was a really stupid typo that cause severe image 
disruptions and I changed code very often, making it more and more 
conservative until I finally found the problem. 
Now I can start changing it back...

> Some time ago I suggested to make the ME multithreaded for single-cpu
> mode also, but I guess this was a really stupid idea. I suppose it
> would be slower(?) 

True.

> and the multithreaded code would be much less
> portable. 

Also true.

> So it's good like it's now...

Helmut Kohl couldn't have said it better. ;-p

Christoph 

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