Re: Max 50% usage on dual-core CPU

[Chris Stanley <cstanley at cctv dot org>]

I got a reply back from the other list and it was an ffmpeg issue with 
an easy fix.  Sorry for the bother, thanks!

--

Chris Stanley

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Chris Stanley wrote:
> I'm working with ffmpeg which uses Pthreads-w32 in Windows XP Pro SP2. 
> I've used both Pthreads-w32 2.8.0 and 2.9.0 (which as far as I can tell 
> doesn't exist, but is bundled with the Celtic Druid ffmpeg binaries 
> nonetheless).
>
> When using a single-core system (Celeron 2.5Ghz), everything is fine and 
> ffmpeg/Pthreads-w32 eagerly uses 97-99% of my CPU.  But when I move the 
> same code to a dual-core system (P4 3Ghz), it will never exceed exactly 
> 50% of the CPU.  By default it uses both cores at about 20/30.  If I 
> change the affinity and restrict it to one core, then it uses the whole 
> thing but again won't exceed exactly 50% of the total CPU.  I get the 
> same results reading from and writing to a flash drive, so I don't think 
> it's an I/O bottleneck.
>
> I'm posting this to the ffmpeg list as well, but it seems like this 
> could be something related to Pthreads-w32.  Does anyone have any 
> thoughts about what might be going on?
>
> Thanks!