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

[Srihari Sridhar]

Hi,

Any updates or new ideas on the issue?

Yours truly,
S Srihari

On Mon, 23 May 2022 at 18:00, Srihari Sridhar <gshari9918 at gmail.com> wrote:

> Hi,
>
> I tried on AMD ThreadRipper 3990x machine. It has 64 cores and 128 logical
> processors. The windows make starts failing with 64 threads.It worked
> successfully until 32 and even 48 threads.
>
> Regards,
> S Srihari
>
> On Thu, 19 May 2022 at 15:42, Wolfgang Haupt <haupt.wolfgang at gmail.com>
> wrote:
>
>> > 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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>> >>
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>> >>
>> >>
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>>
>