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13th March 2019, 19:43 | #1 | Link |
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Join Date: Jan 2015
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HEVC CPU load with Threadripper - "threading" it right?!
Hi
it has been posted a couple of times that HEVC doesn't fully utilize high core count CPUs in 1080p and even 2160p. Today I did some testing and I was really surprised at the outcome: x265 "defaults": numa-pools=32 frame threads=6 CPU load: 60-75% Encoding at FPS = 5,9 x265 settings I had used for the last months to improve quality: numa-pools=32 frame threads=2 CPU load: 65% Encoding at FPS = 6,2 Since the CPU load was far from utilized 100% I thought it is time to RTFM again. After reading it I set "numa pools = 1" since I have only a 1 Socket CPU. x265 "numa 1": numa-pools=1 frame threads=1 CPU load = 2-3% Encoding at FPS = 0,3 x265 "numa 48": numa-pools=48 frame threads=1 CPU load = 88% Encoding at FPS = 7,3 x265 "numa 48 - II": numa-pools=48 frame threads=2 CPU load = 100% Encoding at FPS = 7,8 x265 "numa 48 - III": numa-pools=48 frame threads=3 CPU load = 100% Encoding at FPS = 8,2 So increasing numa-pools does help with CPU utilization and speed. With frame-thread=2 the load was 100%. Increasing numa-pools over 48 did not increase CPU load or speed in FPS any further for me. Also when using standard numa-pools of 32 increasing frame-threads over 1 only seems to speed up the encode until a value of 2 as it can be seen that the encode with frame-thread 6 is a tad slower than with 2. But a frame-thread value of 2 or 3 can see a real benefit after increasing the number of numa-pool to 48 since FPS maximum was 8,2 with frame-threads=3 and numa-pools=48. Further increasing frame-threads to 5 did not result in higher FPS. So question is: Is there any disadvantage with using high numa-pools as there is quality degradation when using higher frame-threads? cheers Last edited by blublub; 14th March 2019 at 13:21. Reason: Added more results and re-run 1st batch. Removed erronous result with 9fps. |
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