Hi,

Can you make an image of your Raspbian setup and give me a link to download it so I can proceed with some tests on my own?

A deb package would be Ok too ;)

How many threads do you activate on your Pi 2:

dcpomatic_server_cli -t 4 to run 4 threads in parallel.

Did you have a look to some kind of monitoring app like Htop while encoding, to see how ARM cores react to the load?

Thanks in advance,

Fred

De: "David Nedrow via DCPomatic" <dcpomatic@carlh.net>
À: "Jim Dummett" <j@dummett.org>
Cc: dcpomatic@carlh.net
Envoyé: Mardi 28 Avril 2015 18:40:12
Objet: Re: [DCP-o-matic] dcpomatic on Raspberry Pi / Raspian
I’ll do new tests with Carl’s “official” test materials, that way people can get a direct comparison with there own setup.
-David
> On Apr 28, 2015, at 11:19 AM, Jim Dummett <j@dummett.org> wrote:
>
> Even more interesting! Please keep us updated as you add more nodes.
>
> When you say 1 frame per sec, what format are you encoding from/to? I've found on a Macbook Pro retina with 2.4Ghz i5 processor, encoding from 1080p ProRes Quicktime to Flat container 2K DCP at 100Mbit, I'm only getting 2 or 3 frames/sec. So adding another frame/sec for the cost of a Rasberry Pi would be very good value!
>
> Jim
>
>
> On 28/04/2015 15:43, David Nedrow wrote:
>> An inexpensive render farm is exactly why I got DCP-o-matic compiled on the Pi 2.
>>
>> So far, adding a single Raspberry Pi 2 increased my encode speed by an additional frame per second. I’m working on adding a second Pi 2, so we’ll see if the performance increase is linear.
>>
>> I’m sure I haven’t optimized the compiled code very well, so with some work we could probably squeeze more performance out of DCP-o-matic.
>>
>> One benefit I see to using the Pi is that I can easily expand the “farm” one unit at a time as I can afford it, rather than having to shell out for a single big box. Plus, if one goes bad, I can easily replace it. If a single big server goes down, my whole render server is gone.
>>
>> -David
>>
>>> On Apr 28, 2015, at 4:54 AM, Jim Dummett via DCPomatic <dcpomatic@carlh.net> wrote:
>>>
>>> Hi David.
>>>
>>> This is really interesting. What kind of performance are you getting from it?
>>>
>>> I have been wondering about if it might be a viable option to make a kind of render farm out of 20-50 Raspberry Pi, and whether that'd work out cheaper in terms of processing power per buck than buying one big fast multi-processor machine.
>>>
>>> Jim
>>>
>>>
>>> On 27/04/2015 22:36, David Nedrow via DCPomatic wrote:
>>>> I’ve been able to compile DCP-o-matic on Raspberry Pi 2’s using the Raspian disk image. I had to install a few packages and compile/install a couple of third party libraries. I also had to make some changes to the script file to take into account that the CPU is an ARM chip, and not Intel x86.
>>>>
>>>> Carl, any chance you’d be willing to take on another platform for your package distribution? Raspian is a direct Debian implementation, so you should be able to re-use a lot of your setup.
>>>>
>>>> I’d be willing to donate a configured Pi 2 to the project if that would help.
>>>>
>>>> -David
>>>>
>>>>
>>>>
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>

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