[FFmpeg-devel] [PATCH 2/2] avutil/slicethread: Add a maximum constraint of 16 slice threads

[Gyan Doshi]

On 2021-11-05 06:02 pm, lance.lmwang at gmail.com wrote:
> From: Limin Wang <lance.lmwang at gmail.com>
>
> Signed-off-by: Limin Wang <lance.lmwang at gmail.com>
> ---
>   libavutil/slicethread.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/libavutil/slicethread.c b/libavutil/slicethread.c
> index 867ce32..7b3a106 100644
> --- a/libavutil/slicethread.c
> +++ b/libavutil/slicethread.c
> @@ -104,7 +104,7 @@ int avpriv_slicethread_create(AVSliceThread **pctx, void *priv,
>       if (!nb_threads) {
>           int nb_cpus = av_cpu_count();
>           if (nb_cpus > 1)
> -            nb_threads = nb_cpus + 1;
> +            nb_threads = FFMIN(nb_cpus + 1, 16);

Do you see diminishing returns with nb_threads > 16? Or slower filter 
throughput?

Regards,
Gyan