[FFmpeg-user] Help with excessive CPU usage

[Loadlinx]

On Wednesday, February 19, 2014, Reindl Harald <h.reindl at thelounge.net>
wrote:

>
>
> Am 19.02.2014 20:00, schrieb Loadlinx:
> > On Wednesday, February 19, 2014, Reindl Harald <h.reindl at thelounge.net<javascript:;>
> >
> > wrote:
> >
> >>
> >>
> >> Am 19.02.2014 17:01, schrieb Tom Evans:
> >>> On Wed, Feb 19, 2014 at 3:34 PM, Reindl Harald <h.reindl at thelounge.net<javascript:;>
> <javascript:;>>
> >> wrote:
> >>>>
> >>>> Am 19.02.2014 16:25, schrieb Tom Evans:
> >>>>> On Wed, Feb 19, 2014 at 2:34 PM, Loadlinx <limiteddi at gmail.com<javascript:;>
> <javascript:;>>
> >> wrote:
> >>>>>> Not identical, but 16 cores.
> >>>>>> server1: E7330
> >>>>>> server2: E7340 (slightly larger L2)
> >>>>>>
> >>>>>> Everything else but CPU is 1:1
> >>>>>
> >>>>> So why doesn't your E7340 support SSE4.1?
> >>>>
> >>>> why should it?
> >>>
> >>> One server runs fast enough for him; on that server ffmpeg reports it
> >>> is using CPU features SSE 4.1
> >>>
> >>> One server does not run fast enough for him; on that server ffmpeg
> >>> does not use SSE 4.1
> >>>
> >>> Don't be so pedantic
> >>
> >> thank you for strip the technical informations i posted
> >> and instead stating that i am pedantic
> >>
> >> i used google to search the ark database for you and provided the
> >> information that this CPU simply has no SSE4.1 capability, frankly
> >> the E7330 as built by Intel also has *no* SSE4.1 support
> >>
> >> https://www.google.at/search?q=ark+englisch+E7330
> >> Status: End of Life
> >> Launch Date: Q3'07
> >> Expected Discontinuance: Q1'2010
> >> Processor Number: E7330
> >> Lithography: 65 nm
> >>
> >> again http://en.wikipedia.org/wiki/SSE4#SSE4.1
> >> These instructions were introduced with Penryn microarchitecture,
> >> the 45 nm shrink of Intel's Core microarchitecture
> >>
> >> and no you do not just throw away a CPU like a Xeon-E7 which
> >> costs around 2000 EURO
> >>
> >>
> > Hard to believe that the process is the issue here. It it simply because
> of
> > SSE4.1 support?
>
> no, it improves performance but for sure not that massive
> in general i responded to "So why doesn't your E7340 support SSE4.1" with
> facts
>
> what makes me *really* wonder is that ffmpeg pretends that E7330 has SSE4.1
> because as said above this CPU was built before SSE4.1 was introduced at
> all
>
> so that is interesting in case where takes ffmpeg that information, or is
> it *really* that CPU and what happens if ffmpeg believes for whatever
> reason a CPU supports SSE4.1 or whatever SIMD instrcutions while it
> actually does not - normally i would expect a segfault with a error
> message like "unkown instruction"
>
> at least such errors are what i have seen in "-mtune native" builds for
> several packages trying to run them on a older VNMware host :-)
>
> Any ideas what further troubleahooting stepa i could take to see if its
really the CPU? Would be a bummer if i had to get an additional box.