[FFmpeg-devel] Issue - Error Due to higher number of threads

[Wolfgang Haupt]

> Hi,
>
> Thanks for the reply. I checked the memory usage while building ffmpeg with
> 64 threads. The machine I tested has 128 GB ram. While I tested it I found
> that maximum memory utilized by the build of ffmpeg was 17GB.  Still the
> build throws up error semaphore or child process wait (Error 87 : The
> parameter is incorrect). Hence could you check on the same please. I have
> attached screenshots of memory utilized from the task manager.

What CPU are you on?
There is some complexity regarding the amount of threads and
process groups on windows, see: 
https://www.windowscentral.com/windows-10-pro-cant-handle-amd-threadripper-3990xs-128-threads

Do you even have a processor that will utilize 64 cores?
I recommend trying with smaller values and see where "windows make" 
starts to fail.

>
> Regards,
> S Srihari
>
> On Thu, 12 May 2022 at 16:45, Timo Rothenpieler <timo at rothenpieler.org>
> wrote:
>
>> On 12.05.2022 04:22, Srihari Sridhar wrote:
>>> Hi,
>>>
>>> I was building ffmpeg through windows. While I was able to successfully
>>> able to build for smaller number of threads, for larger number of
>> threads I
>>> faced an issue
>>>
>>> The commands I used were
>>> bash ./configure --arch=x86 --target-os=mingw32 --disable-x86asm
>>> make -j <no_of_Threads>
>>>
>>> While building with 4 Threads the build was successful
>>> Screenshot:
>>> [image: image.png]
>>>
>>> While building with 64 threads, I faced the following error,
>>> Screenshot :
>>> [image: image.png]
>>>    semaphore or child process wait (Error 87 : The parameter is incorrect)
>> Please don't use images for plain text. It's hard to access and barely
>> legible.
>>
>>> Please could you check this issue. Thanks
>> You probably just ran out of RAM or something. Highly unlikely that this
>> is an issue with ffmpeg.
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