Re: [FFmpeg-devel] CI

[Timo Rothenpieler via ffmpeg-devel <ffmpeg-devel@ffmpeg.org>]

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On 8/20/2025 9:25 PM, Michael Niedermayer via ffmpeg-devel wrote:
> Hi
> 
> On Wed, Aug 20, 2025 at 05:56:27PM +0200, Timo Rothenpieler via ffmpeg-devel wrote:
>> On 8/20/2025 1:26 AM, Michael Niedermayer via ffmpeg-devel wrote:
>>> Hi
>>>
>>> It seems the forgejo CI takes about
>>> 13min to do fate on aarch64 and x86-64 and build on win64
>>>
>>> Locally i run
>>>       fate + install on x86-64
>>>       build on x86-32, mingw64, arm32, mips, ppc, x86-64 + shared libs
>>>       testprogs alltools examples build on x86-64, x86-32 and arm32
>>>       in 2min 44sec
>>>
>>> can we improve the speed vs amount of tests ratio ?
>>> (its not a problem ATM, i did in fact not even notice as i never waited on it)
>>>
>>> Iam just seeing the difference in time and i think there is potential for
>>> optimization here
>>>
>>> I dont think my box here is really special, just a
>>> AMD Ryzen 9 3950X 16-Core + Samsung SSD 970 PRO
>>
>> Well, the test runners are 4 cores and 8GB of RAM. So that'll be the primary
>> difference in speed.
>> I think they're performing pretty good for being just that.
>>
>> We could of course throw money at the problem and turn them into 16 core
>> machines. That would up the hosting cost of the runners from currently
>> 3*7.5€ a month to 3*30€ a month. Just for the runners.
>>
>> imo the current CI turnaround times are fine. 15-20 minutes per job is fine,
>> as long as they can all run in parallel.
> 
> Option 1: 15-20 min CI turnaround,  270 € per year
> Option 2:  4-5? min CI turnaround, 1080 € per year
> 
> we have over 150k $ it seems
> 
> Good use of capital can also lead to more donations
> 
> I think the main question is, "would we benefit from the faster trunaround"?
> or not ?

You have to keep in mind, 4 Core 8GB is also the swarm of runners we get 
for free from Microsoft via GitHub.

So the choice is actually "Be able to process 20+ jobs in parallel that 
take 15-20 minutes each" vs. "Be able to process 3 or so at a time 
(roughly one PR/push) in 5 minutes".
So realistically, unless we also pay for an actual swarm of runners 
ourselves(which would cost 10k or more a year while being idle 95% of 
the time) the total turnaround time including wait for a free runner is 
probably still better with more of the smaller runners than less of the 
big ones.

It'd also make it a lot more pressing to think about every single CI job 
we add, vs. having a bit of leeway due to the over-abundance of runners.

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