[x265] x265 CPU utilization very low on a multi-numa sockets server

[Mario *LigH* Rohkrämer]

Hi Cheng.

This issue has been discussed before in the VideoHelp forum.  
Parallelization is a bit more limited because dependencies between tasks  
in HEVC algorithms are possibly more restrictive than in AVC algorithms  
(many parts of the HEVC algorithm need to wait for others finishing  
intermediate results, and splitting the video frame across too many slices  
would hurt the encoding efficiency).

But it is easily possible to run several applications in parallel so that  
they each get a share of available cores.


Am 28.07.2015, 03:58 Uhr, schrieb Ximing Cheng <chengximing1989 at gmail.com>:

> Hi, I am testing x265 with a two numa nodes server, each node has 36  
> cores.
> The x265 version is 1.7 release with command line
>
> ./x265 --input-res 1920x1080 --input input.yuv --bitrate 1200  
> --vbv-maxrate
> 1380 --fps 20 --early-skip --preset fast -o test1.hevc
>
> but when ruuning on the server, CPU utilization ranges from 27% ~ 35% (<
> 40%) which means most of the CPU cores are not busy.
>
> x265 [info]: HEVC encoder version 1.7x265 [info]: build info
> [Linux][GCC 4.4.6][64 bit] 8bppx265 [info]: using cpu capabilities:
> MMX2 SSE2Fast SSSE3 SSE4.2 AVX AVX2 FMA3 LZCNT BMI2x265 [warning]:
> --psnr used with AQ on: results will be invalid!x265 [warning]: --tune
> psnr should be used if attempting to benchmark psnr!x265 [info]: Main
> profile, Level-4 (Main tier)x265 [info]: Thread pool 0 using 36
> threads on NUMA node 0x265 [info]: Thread pool 1 using 36 threads on
> NUMA node 1x265 [info]: frame threads / pool features       : 16 /
> wpp(34 rows)+pmodex265 [warning]: VBV maxrate specified, but no
> bufsize, ignoredx265 [info]: Coding QT: max CU size, min CU size : 32
> / 8x265 [info]: Residual QT: max TU size, max depth : 32 / 2 inter / 2
> intrax265 [info]: ME / range / subpel / merge         : star / 57 / 1
> / 2x265 [info]: Keyframe min / max / scenecut       : 20 / 250 /
> 40x265 [info]: Lookahead / bframes / badapt        : 60 / 4 / 2x265
> [info]: b-pyramid / weightp / weightb / refs: 1 / 1 / 1 / 1x265
> [info]: AQ: mode / str / qg-size / cu-tree  : 1 / 0.3 / 32 / 1x265
> [info]: Rate Control / qCompress            : ABR-1200 kbps / 0.60x265
> [info]: tools: rect amp rd=4 rdoq=2 early-skip signhide tmvp b-intra


-- 

Fun and success!
Mario *LigH* Rohkrämer
mailto:contact at ligh.de