Re: [FFmpeg-devel] [PATCH 1/2] avutil/executor: Allowing thread_count be zero

[Nuo Mi <nuomi2021@gmail.com>]

On Tue, Jun 18, 2024 at 8:06 PM Steven Liu <lingjiujianke@gmail.com> wrote:

> Nuo Mi <nuomi2021@gmail.com> 于2024年6月18日周二 19:51写道：
> >
> > On Mon, Jun 17, 2024 at 5:28 PM Zhao Zhili <quinkblack@foxmail.com>
> wrote:
> >
> > >
> > >
> > > > On Jun 17, 2024, at 16:45, Hendrik Leppkes <h.leppkes@gmail.com>
> wrote:
> > > >
> > > > On Mon, Jun 17, 2024 at 10:03 AM Zhao Zhili <quinkblack@foxmail.com>
> > > wrote:
> > > >>
> > > >>
> > > >>
> > > >>> On Jun 17, 2024, at 15:05, Anton Khirnov <anton@khirnov.net>
> wrote:
> > > >>>
> > > >>> Quoting Zhao Zhili (2024-06-17 07:19:26)
> > > >>>> From: Zhao Zhili <zhilizhao@tencent.com>
> > > >>>>
> > > >>>> When thread_count be zero, it will be run on current thread like
> > > >>>> !HAVE_THREADS.
> > > >>>
> > > >>> Other APIs treat zero to mean "auto".
> > > >>
> > > >> executor don’t detect cpu cores by itself. It’s more low level than
> > > libavcodec.
> > > >>
> > > >> Zero thread is zero thread, literally. If we use thread_count one to
> > > mean
> > > >> run on current thread, how to create a single thread then?
> > > >
> > > > Whats the point of creating a single thread? Does the main thread
> ever
> > > > do something else in the meantime, or does it just wait for the job
> > > > anyway?
> > >
> > > Executor as a basic infrastructure should support such usage. The
> caller
> > > don’t need to wait for the job to finish.
> > >
> > Hi Zhili,
> > Thank you for the patch.
> > Could you explain more about its usage?
> > Why do we need to run everything in the main thread when we have pthread
> in
> > the system?
> Just control CPU resource be used by decoder, perhaps the computer is
> running some other applications.
> There are running more application in one computer, and the ffmpeg
> decoder is need not realtime.
> For example running machine learning traning some model, and use
> ffmpeg transcoding vod videos,
> but transcode functions is borrow machine learning's team computers :D.
>
You can use "taskset" for CPU affinity. It will constrain the CPU resources
used by a process.

>
> >
> > Thank you.
> > _______________________________________________
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> >
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>
> Thanks
> Steven
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