[libdv-dev] Re: API Change / slowdown !

[Charles 'B. K. <kr...@ac...>]

Hmm.  

Some of my changes could effect performance, mainly due to cache
footprint issues.

However, I just tried a similar test and got only a very slight
difference.  (~0.15s for 150 frames).  (I used -D 2000-11-20).

Did you run your test several times to ensure warm filesystem caches?

-- Buck

Stefan Lucke <lu...@sn...> writes:

> Hi Buck,

> I just compared lastest version (with if (Success == Xv ....))
> with a version checked out with option -D 2000-11-20 (without API change
> but YUY2.c changes).

> Runtime difference is about 2.7 seconds in user mode for a 150 picture
> sequence (for 10 seconds to 13 seconds). I used '-mcpu=i686 -s -O6' as
> compile options.

> old time playdv:
> real    0m13.189s
> user    0m10.690s
> sys     0m0.410s

> new time playdv:
> real    0m15.769s
> user    0m13.310s
> sys     0m0.210s

> -- 
> 
> mfg
> 
>   Stefan Lucke (lu...@sn...)