[vlc-devel] vlc x246 benchmark
kaarlo.raiha at gmail.com
Mon Mar 22 08:40:50 CET 2010
The basic questions first:
1. You compile the kernels manually? (and always with same options?)
2. You run multicore box? (and use Auto option for threads with x264?)
2010/3/21 Jure Pečar <pegasus at nerv.eu.org>
> After reading http://x264dev.multimedia.cx/?p=185 I deceided to do a
> simple benchmark.
> I have a vlc 1.0.1 running on ubuntu 8.10. I'm timing a transcode of a 20h
> long dump of a random tv channel here in h264 from tv resolution to 640x480
> again in h264, comparing different ubuntu kernels on same machine.
> 2.6.24-24: 1057min user + 11m11s sys time
> 2.6.27-17: 823min51s user + 15min20s sys time
> 2.6.28-18: 1063m3s user + 15m0s sys time
> 2.6.31-20: 872m5s user + 94m55s sys time
> 2.6.32-16 kernel from not yet released ubuntu 10.04: 875min35s user +
> 93min43s sys time.
> Based on the above reading I would expect much better result on newer
> kernel, but what I see does not fit the expectations. Is time(1) a proper
> way to evaluate efficiency of a transcode? Why do I see such drastic
> differences bot in user and in system time? Environment, other running
> processes and hw configuration are the same for all tests, the only thing
> changing is the kernel.
> Jure Pečar
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