[FFmpeg-devel] transcoding on nvidia tesla

Ian Caulfield ian.caulfield
Fri Feb 1 01:14:40 CET 2008

On Feb 1, 2008 12:05 AM, M?ns Rullg?rd <mans at mansr.com> wrote:
> Is there any reason to believe that each of these threads has the
> power of a full CPU at its disposal?

Nowhere near - they're more like a funky SIMD - the threads are
grouped into 16's, which follow the same execution path - if threads
diverge, they have to be serialised. However, with careful
programming, very good memory bandwidth can be achieved. Memory
bandwidth on/off chip can be an issue though. I don't see 1000x
speedups for video coding - 10x seema more likely, at the cost of a
lot of development time.


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