From: Lance Wang <lance.lmwang@gmail.com>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: Re: [FFmpeg-devel] [RFC/PATCH] bitpacked_dec: Optimization for bitpacked_dec decoder performance
Date: Wed, 10 May 2023 19:16:14 +0800
Message-ID: <CAM=jba_BAvFdJH9by6x9yaCppOTq5ff7tvw=KWU3Rvsd2igxsw@mail.gmail.com> (raw)
In-Reply-To: <CAHGibzHM6dpohv_9qVvDCY9KhggrJoajG256cx7NwCq5xk8C+g@mail.gmail.com>
On Sat, May 6, 2023 at 8:41 PM Devin Heitmueller <
devin.heitmueller@ltnglobal.com> wrote:
> On Sat, May 6, 2023 at 8:16 AM James Almer <jamrial@gmail.com> wrote:
> > Can you bench with the START_TIMER and STOP_TIMER macros in timer.h?
> > Also, define CACHED_BITSTREAM_READER in bitpacked_dec.c before including
> > git_bits.h and test the actual implementation again, to see if it makes
> > any difference.
>
> Original code:
> 671661910 decicycles in bitpacked_dec, 1 runs, 0 skips
> 669736380 decicycles in bitpacked_dec, 1 runs, 0 skips
> 669370700 decicycles in bitpacked_dec, 1 runs, 0 skips
>
> Original code with CACHED_BITSTREAM_READER defined
> 352599030 decicycles in bitpacked_dec, 1 runs, 0 skips
> 336163810 decicycles in bitpacked_dec, 1 runs, 0 skips
> 344628350 decicycles in bitpacked_dec, 1 runs, 0 skips
>
> My proposed versioned:
> 257353330 decicycles in bitpacked_dec, 1 runs, 0 skips
> 271527000 decicycles in bitpacked_dec, 1 runs, 0 skips
> 252701500 decicycles in bitpacked_dec, 1 runs, 0 skips
>
>
Yes, it's show better performance, so LGTM if nobody have plan to optimize
the bitstream
function.
Devin
>
> --
> Devin Heitmueller, Senior Software Engineer
> LTN Global Communications
> o: +1 (301) 363-1001
> w: https://ltnglobal.com e: devin.heitmueller@ltnglobal.com
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next prev parent reply other threads:[~2023-05-10 11:16 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-05 21:54 Devin Heitmueller
2023-05-06 11:32 ` Lance Wang
2023-05-06 11:49 ` Devin Heitmueller
2023-05-06 11:52 ` Paul B Mahol
2023-05-06 12:13 ` Devin Heitmueller
2023-05-06 12:16 ` James Almer
2023-05-06 12:40 ` Devin Heitmueller
2023-05-10 11:16 ` Lance Wang [this message]
2023-05-11 22:20 ` Marton Balint
2023-05-12 15:26 ` Devin Heitmueller
2023-12-13 19:58 ` [FFmpeg-devel] [PATCH] avcodec/bitpacked_dec: optimize bitpacked_decode_yuv422p10 Marton Balint
2023-12-28 20:42 ` Marton Balint
2023-06-12 16:05 ` [FFmpeg-devel] [RFC/PATCH] bitpacked_dec: Optimization for bitpacked_dec decoder performance Paul B Mahol
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