ffmpeg & ULE

[Urmas Lett]

On 10/18/2011 4:26 PM, Steven Hartland wrote:
>
> ----- Original Message ----- From: "Urmas Lett" <urmas.lett at eenet.ee>
>
>
>> On 10/18/2011 3:36 PM, Steven Hartland wrote:
>>> What happens if you either:
>>> 1. disable HT in the bios
>>
>> Intel says i5-2400 has no HT:
>> Processor Number i5-2400
>> # of Cores 4
>> # of Threads 4
>>
>> and BIOS has no HT disable knob
>
> Ahh yes of course.
>
>>
>>> 2. limit the threads to 4?
>>
>> ffmpeg -threads 4 (sched_ule):
>>
>> real 3m19.379s (with -threads 0 was 2m52.711s)
>> user 6m50.107s (with -threads 0 was 6m50.310s)
>> sys 0m1.507s
>>
>> top -H:
>> CPU: 0.0% user, 55.8% nice, 0.4% system, 0.0% interrupt, 43.8% idle
>> Mem: 136M Active, 884M Inact, 498M Wired, 84K Cache, 409M Buf, 2339M Free
>> Swap: 4096M Total, 4096M Free
>>
>> PID USERNAME PRI NICE SIZE RES STATE C TIME WCPU COMMAND
>> 1178 root 52 20 255M 140M uwait 1 1:05 51.17% ffmpeg{ffmpeg}
>> 1178 root 103 20 255M 140M CPU0 1 0:59 37.60% ffmpeg{ffmpeg}
>> 1178 root 52 20 255M 140M uwait 3 0:59 37.16% ffmpeg{ffmpeg}
>> 1178 root 52 20 255M 140M uwait 3 0:59 34.38% ffmpeg{ffmpeg}
>> 1178 root 52 20 255M 140M uwait 2 0:54 33.59% ffmpeg{ffmpeg}
>> 1178 root 102 20 255M 140M CPU2 0 0:46 32.37% ffmpeg{ffmpeg}
>> 1171 root 20 0 67992K 5516K select 2 0:00 0.00% sshd
>
> That seems to be using 6 threads not 4, what about -threads 2?

real    3m7.826s
user    6m49.813s
sys     0m1.581s

CPU:  0.0% user, 57.9% nice,  0.0% system,  0.0% interrupt, 42.1% idle
Mem: 116M Active, 18M Inact, 457M Wired, 112K Cache, 376M Buf, 3265M Free
Swap: 4096M Total, 4096M Free

   PID USERNAME PRI NICE   SIZE    RES STATE   C   TIME   WCPU COMMAND
  1224 root     106   10   223M   117M CPU2    2   0:33 79.98% 
ffmpeg{ffmpeg}
  1224 root      52   10   223M   117M uwait   1   0:31 76.76% 
ffmpeg{ffmpeg}
  1224 root      94   10   223M   117M CPU3    3   0:20 40.77% 
ffmpeg{ffmpeg}
  1224 root      90   10   223M   117M CPU1    0   0:14 28.76% 
ffmpeg{ffmpeg}
  1215 root      20    0 67992K  5516K select  2   0:00  0.00% sshd


Regards,
Urmas Lett

Tel:    +(372) 7 302 110
Fax:    +(372) 7 302 111
E-Mail: urmas.lett at eenet.ee