[x265] Question about NUMA and core/thread use

[Michael Lackner]

Hey,

I re-enabled NUMA and retried with --no-pmode --no-pme, and x265 once again says:

x265 [info]: Thread pool 0 using 30 threads on numa nodes 0,1

Still wondering why not 32, but ok.

It was looking bad at first, but I thought I'd wait a bit for ffmpeg to feed the pipe
enough (I'm piping to x265), and after 10-20 seconds it showed *very* good and stable CPU
utilization (minus those 2 threads occasionally)!

I'll change my encoding settings to not use pmode and pme then! Seems that's the way to
go, thank you very much for the advice!

I'll compare the runtimes and let you know how much enabling NUMA affected the outcome, as
I'm quite interested in that part myself..

Best,
Michael

On 05/04/2017 09:26 AM, Mario *LigH* Rohkrämer wrote:
> Just a brief reply:
> 
>> First, I compiled and linked against libnuma to build myself a NUMA-aware version. Then I
>> tried to encode some 8K content with wpp, pmode and pme.
> 
> Try as well without pmode or pme. These can easily have side effects, are only useful in
> specific cases. I would guess that WPP can work more efficiently without in most use
> cases, I just don't remember the explanation why (I know it had been discussed with Selur
> in the doom9 forum before).

-- 
Michael Lackner
Lehrstuhl für Informationstechnologie (CiT)
Montanuniversität Leoben
Tel.: +43 (0)3842/402-1505 | Mail: michael.lackner at unileoben.ac.at
Fax.: +43 (0)3842/402-1502 | Web: http://institute.unileoben.ac.at/infotech