ffmpeg not using all cores

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Posted by user2783132 on Super User See other posts from Super User or by user2783132
Published on 2013-11-03T21:37:58Z Indexed on 2013/11/03 22:02 UTC
Read the original article Hit count: 421

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I just got my new server with two intel e5-2695 but I was shocked to see that ffmpeg or ubuntu doesn't utilize all cores.

top while ffmpeg was running

top - 23:35:25 up  2:41,  2 users,  load average: 5.35, 4.37, 3.12
Tasks: 333 total,   2 running, 331 sleeping,   0 stopped,   0 zombie
%Cpu0  :  0.0 us,  1.0 sy, 35.6 ni, 63.4 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu1  :  0.0 us,  0.7 sy, 35.5 ni, 63.9 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu2  :  0.0 us,  0.7 sy, 33.4 ni, 65.9 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu3  :  0.0 us,  0.0 sy, 32.7 ni, 67.3 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu4  :  0.0 us,  0.3 sy, 32.3 ni, 67.3 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu5  :  0.0 us,  0.3 sy, 33.0 ni, 66.7 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu6  :  0.0 us,  0.0 sy, 32.6 ni, 67.4 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu7  :  0.0 us,  0.3 sy, 32.7 ni, 67.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu8  :  0.0 us,  0.7 sy, 32.6 ni, 66.8 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu9  :  0.0 us,  0.3 sy, 33.9 ni, 65.8 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu10 :  0.0 us,  0.0 sy, 35.0 ni, 65.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu11 :  0.0 us,  0.7 sy, 30.0 ni, 69.3 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu12 : 21.1 us,  0.0 sy,  0.0 ni, 78.9 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu13 :  0.7 us,  0.0 sy,  4.3 ni, 95.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu14 :  0.3 us,  0.0 sy,  5.0 ni, 94.6 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu15 : 24.9 us,  0.0 sy,  0.0 ni, 75.1 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu16 :  0.3 us,  0.0 sy,  3.7 ni, 96.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu17 :  0.7 us,  0.3 sy,  4.9 ni, 94.1 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu18 :  1.0 us,  0.0 sy,  4.6 ni, 94.4 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu19 :  0.7 us,  0.0 sy,  4.7 ni, 94.7 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu20 : 11.1 us,  0.0 sy,  0.0 ni, 88.9 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu21 :  1.3 us,  0.0 sy,  4.6 ni, 94.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu22 :  2.0 us,  0.3 sy,  4.3 ni, 93.4 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu23 : 96.7 us,  1.0 sy,  0.0 ni,  2.3 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu24 :  0.0 us,  0.0 sy,  0.7 ni, 99.3 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu25 :  0.0 us,  0.0 sy,  3.0 ni, 97.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu26 :  0.0 us,  0.0 sy,  1.3 ni, 98.7 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu27 :  0.0 us,  0.0 sy,  4.0 ni, 96.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu28 :  0.0 us,  0.0 sy,  1.7 ni, 98.3 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu29 :  0.0 us,  0.0 sy,  1.7 ni, 98.3 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu30 :  0.0 us,  0.0 sy,  1.7 ni, 98.3 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu31 :  0.0 us,  0.0 sy,  1.0 ni, 99.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu32 :  0.0 us,  0.0 sy,  0.7 ni, 99.3 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu33 :  0.0 us,  0.0 sy,  1.7 ni, 98.3 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu34 :  0.0 us,  0.0 sy,  2.0 ni, 98.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu35 :  0.0 us,  0.0 sy,  1.0 ni, 99.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu36 :  0.0 us,  0.0 sy,  0.0 ni,100.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st

ffmpeg was sent with -threads 0

*I also tried sending ffmoeg with -threads 500- no difference

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