[Libav-user] gcc auto-vectorisation
"René J.V. Bertin"
rjvbertin at gmail.com
Wed Feb 27 17:46:11 CET 2013
On Feb 27, 2013, at 17:37, Claudio Freire wrote:
>> Detailed benchmark results: (32 bit, MMX/SSE code, -fno-tree-vectorize)
>> samples user t kernel t real t CPU %
>> Video decode : 85166 27.0846s 2.48361s 13.5333s 218.484%
> Wait... 200%... what's your hardware like?
> If by any chance you have Hyper Threading enabled (which is quite
> likely), then I bet that's what the penalty is coming from (there's
Ah, ok. I have a dual core, hyper-threaded i7 . Do you think there's an interest other than academic to deactivate hyper threading?
More information about the Libav-user