[x264-devel] Max thread number of x264

[kenter]

Thanks to Dark Shikari and Alex.

To Dark:
     Yes, my Linux kernel is 2.6.18, Is it right that 2.6.18 only have 15
threads at peak?

To Alex:
    1.How can I check the stats of iowait or disk throughput?
    2. I test the read speed of my hard disk, It shows 7206.39 MB/sec for
cached read while 70.35 MB/sec for non-cached, based on non-cached, only
70.35*1024*1024/(720*576*1.5) = 118fps can be achieved, however, as
"ultrafast" can achieve 800+ fps, I think the cache is more or less helpful,
how can I calculate the peak hard-disk speed ?


2010/4/7 Jason Garrett-Glaser <darkshikari at gmail.com>

> On Tue, Apr 6, 2010 at 9:05 PM, kenter <kenter83 at gmail.com> wrote:
> > Thanks for all your help. I've tried your commandline, the result shows
> for
> > --preset slow, CPU ultilize only 700+ and fps is 70.46. The CPU power is
> > still largely wasted.
>
> x264 does not scale well beyond one thread per ~40 vertical pixels of the
> frame.
>
> Additionally, are you using a Linux kernel of 2.6.31 or earlier?
> There was a serious bug in the scheduler that massively crippled
> performance.
>
> Dark Shikari
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> x264-devel at videolan.org
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