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

[Pradeep Ramachandran]

Ximing Cheng,
To increase CPU utilization, you will have to run a higher resolution video
(targeting a higher bit rate) in a more advanced setting for a longer
duration - a 20 frames of 1080p video encoded with a target bit rate of
1200 in 'fast' preset may not be sufficient to fill out 72 contexts. With
higher resolution videos we do see that heavily threaded machines get
decent utilization; doesn't hit a 100% all the time but it is better than
35%.

Also, I can try reproducing your result if you can you give your complete
command line - the console output shows that some of the default settings
have been altered (like frame threads) but your command line doesn't list
them.

Thanks,
Pradeep.

On Tue, Jul 28, 2015 at 7:28 AM, Ximing Cheng <chengximing1989 at gmail.com>
wrote:

> 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
>
>
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