[x264-devel] Max thread number of x264

[kenter]

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.

The disk bandwidth is I also tried *--preset ultrafast*, the fps can
achieves to 800+, which means that disk bandwidth shouldn't be our
bottle-neck.

2010/4/6 Alex Jurkiewicz <alex at bluebottle.net.au>

> Hi,
>
>  On 6 April 2010 19:52, kenter <kenter83 at gmail.com> wrote:
>
>> Hi, Experts:
>>      I have a server with 24 AMD CPUs equipped, however, when I set x264
>> with --threads 36 *(36 means 24*1.5)*, I found the CPU usage only 800+,
>> which means only 8 CPU cores are filled.
>>
>
> 1.5*(logical cores available) is the default, so no need to set it.
>
>
>>      I also use top -H -p PID to detect the real threads count of x264
>> proc, It shows 15 threads runs simutaneous at peak, I need help that How can
>> I fully ultilize the CPU power?
>>
>>     My command line is:
>>     SRC_FILE.yuv 720x576
>>
>
> You may be constrained by the bandwidth of your disk reading the raw source
> file.
>
>
>> -I 250 -i 25
>>
>
> Defaults.
>
>
>> -b 4 --b-adapt 1 --b-bias 0 --ref 6 --deblock 0:0 --bitrate 500 --qpmin 2
>> --qpmax 51 --qpstep 3 --ratetol 8.0 --aq-mode 0 --sar 16:15 --ipratio 1.25
>> --pbratio 1.25 --pass 0 --partitions all --cqm flat --direct spatial
>> --mvrange-thread 24 --me hex --merange 16 --subme 6 --psy-rd 1.0:0.0
>> --mixed-refs --8x8dct --no-chroma-me --no-fast-pskip --trellis 0 --nr 0
>> --threads 36 --vbv-bufsize 2000 --vbv-init 0.75  --aq-strength 1
>> --chroma-qp-offset 10 --weightb  --fps 25 -o output_file.264
>>
>
> Some of those options are defaults (qpmax), some are non-functional
> (vbv-bufsize without maxrate) and some are just crazy (pass 0?!). Try this
> commandline:
> x264 SRC 720x576 --bitrate 500 --preset slow --bitrate 500 --output OUT
>
>
>>
>>     Thanks!
>>
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>>
>>
> Alex
>
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>
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