[mythtv-users] ffmpeg and multiple CPUs. Was: Should I be switching to 0.21?
gull at gull.us
Tue Apr 15 03:18:32 UTC 2008
lemongecko at gmail.com wrote:
> Telling ffmpeg you have one CPU was the right choice. We do a lot of
> FEA analysis at work, and we did plenty of benchmarking on HT CPUs
> when they came out. We saw results similar to yours, though completely
> disabling HT in the BIOS *improved* our performance.
That's been my experience as well. In one case I had a system that was
acting as a VPN gateway on a gigabit network. Throughput went up
significantly when I turned HT off in the BIOS. I also turn it off on
machines in our high-performance computing cluster.
The fact that more recent Intel CPUs don't seem to support this feature
makes me suspect it was something of a boondoggle all around. Intel
seems to have given up on it and just moved to putting two or four whole
CPUs on one chip.
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