AVX-512 is faster!
I did some benchmarks using
LigH's build x265 2.7+332-593e63cda903 (Win64) above. I used the same build for the AVX2 tests, simply without the "--asm avx512" command.
i9-7900X @ 4.5 GHz all cores, 3.0 GHz mesh/cache, DDR4 4000-17-18-18-41-1T. No AVX2 or AVX-512 multiplier offsets. Max 92 degC package CPU temperature during both veryslow encodes. The faster modes did not saturate all 20 threads.
The source is 1920x1080 8-bit gradient MagicYUV 4:2:0 on a NvME SSD encoding to another NvME SSD. I used the first 1000 frames from Firefly episode 9 which I had already denoised (SMDegrain) and had on my drive.
avs2pipemod.exe -y4mp=1:1 "fireflyshort.avs" | x265_AVX512.exe --input - --y4m -o "D:\temp\fireflyshort.mkv" --asm avx512 --preset veryslow --crf 18.5 --output-depth 10
x265 [info]: HEVC encoder version 2.7+332-593e63cda903
x265 [info]: build info [Windows][GCC 7.3.0][64 bit] 10bit
x265 [info]: using cpu capabilities: MMX2 SSE2Fast LZCNT SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2 AVX512
x265 [info]: Main 10 profile, Level-4 (Main tier)
x265 [info]: Thread pool created using 20 threads
veryslow:
AVX512: encoded 1000 frames in 303.44s (3.30 fps), 4037.41 kb/s, Avg QP:20.64
AVX2: encoded 1000 frames in 335.83s (2.98 fps), 4037.41 kb/s, Avg QP:20.64
medium:
AVX512: encoded 1000 frames in 28.41s (35.20 fps), 3183.67 kb/s, Avg QP:20.46
AVX2: encoded 1000 frames in 30.71s (32.57 fps), 3183.67 kb/s, Avg QP:20.46
veryfast:
AVX512: encoded 1000 frames in 15.47s (64.64 fps), 2769.26 kb/s, Avg QP:20.89
AVX2: encoded 1000 frames in 16.89s (59.20 fps), 2769.26 kb/s, Avg QP:20.89
ultrafast:
AVX512: encoded 1000 frames in 6.86s (145.77 fps), 1398.46 kb/s, Avg QP:25.00
AVX2: encoded 1000 frames in 7.22s (138.41 fps), 1398.46 kb/s, Avg QP:25.00
Thanks to everyone who works on x265 and thanks for the regular builds LigH.
