Not this nonsense again

By: joema (joema4.delete.delete.delete@this.this.this.gmail.com), June 16, 2022 9:13 pm
Room: Moderated Discussions
Anon (lkasdfj.delete@this.fjdksalf.com) on June 16, 2022 3:06 pm wrote:
>
> ..For those scratching your heads, this dude's an armchair quarterback...
> who believes the main reason Apple's chip architects put in many hardware codec
> blocks was to accelerate single stream encode/decode
> to a higher degree than a single block could on its own. He just *knows* it
> must be possible to split the work into multiple threads so that
> multiple codec "cores" can collaborate on it

Actually Apple's own Compressor already does segmented rendering by
transparently splitting a single stream into multiple segments which are encoded
in parallel by multiple TranscoderService processes, then concatenated.
Since ProRes is an all-intra codec there are no GOPs to complicate this.

Anyone with an M1 Max or M1 Ultra system can try this by simply using
Compressor's advanced preferences to enable additional Compressor instances.

You can also transcode four input files in parallel, each handled by a
Compressor instance. That doesn't scale either, as you increase the
files and Compressor instances from 1 to 4.

M1 Ultra with four ProRes encode/decode units is no faster than
M1 Max (which has two) on single-file or multi-file ProRes transcoding, yet they aren't
bottlenecked on CPU, GPU or I/O.

Doing segmented encode/decode of a Long GOP stream is definitely more
difficult but it appears that multiple accelerators are not effectively used
in parallel on segmented single-stream or multi-stream ProRes 422,
which are easier cases.

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TopicPosted ByDate
M2 benchmarks-2022/06/15 12:27 PM
  You mean "absurd ARM"? ;-) (NT)Rayla2022/06/15 02:18 PM
    It has PPC heritage :) (NT)anon22022/06/15 02:55 PM
      Performance per clock2022/06/15 03:05 PM
        Performance per single clock cyclehobold2022/06/16 05:12 AM
          Performance per single clock cycledmcq2022/06/16 06:59 AM
            Performance per single clock cyclehobold2022/06/16 07:42 AM
          Performance per single clock cycleDoug S2022/06/16 09:39 AM
            Performance per single clock cyclehobold2022/06/16 12:36 PM
            More like cascaded ALUsPaul A. Clayton2022/06/16 01:13 PM
              SuperSPARC ALUMark Roulo2022/06/16 01:57 PM
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      M2 benchmarksAdrian2022/06/16 02:09 AM
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          M2 benchmarksAdrian2022/06/16 09:27 AM
            M2 benchmarks---2022/06/16 10:08 AM
              M2 benchmarksAdrian2022/06/16 11:43 AM
                M2 benchmarksDummond D. Slow2022/06/16 01:03 PM
                  M2 benchmarksAdrian2022/06/17 03:34 AM
                    M2 benchmarksDummond D. Slow2022/06/17 07:35 AM
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              M2 benchmarksAdrian2022/06/16 12:44 PM
            M2 benchmarksEric Fink2022/06/17 02:05 AM
        M2 benchmarksAnon2022/06/16 06:28 AM
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            M2 benchmarks => MTAnon2022/06/18 02:38 AM
              M2 benchmarks => MTAdrian2022/06/18 03:25 AM
                M2 benchmarks => MT---2022/06/18 10:14 AM
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        M2 Pro at 3nmEric Fink2022/06/17 02:51 AM
    M2 benchmarksSean M2022/06/16 01:00 AM
      M2 benchmarksDoug S2022/06/16 09:56 AM
        M2 benchmarksjoema2022/06/16 01:28 PM
          M2 benchmarksSean M2022/06/16 02:53 PM
            M2 benchmarksDoug S2022/06/16 09:19 PM
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                  Apple’s STEM AmbitionsSean M2022/06/17 04:18 AM
                    Apple’s STEM Ambitions---2022/06/17 09:33 AM
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                        Mac Pro with Nvidia H100Doug S2022/06/17 10:37 PM
                          Mac Pro with Nvidia H100Tony Wu2022/06/18 06:49 AM
                            Mac Pro with Nvidia H100Dan Fay2022/06/18 07:40 AM
                          Mac Pro with Nvidia H100Anon42022/06/20 09:04 AM
                            Mac Pro with Nvidia H100Simon Farnsworth2022/06/20 10:09 AM
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                            Mac Pro with Nvidia H100Doug S2022/06/20 10:19 AM
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                            Mac Pro with Nvidia H100me2022/06/19 10:08 AM
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                                Mac Pro with Nvidia H100Elliott H2022/06/19 06:39 PM
                            Mac Pro with Nvidia H100Doug S2022/06/19 06:16 PM
                              Mac Pro with Nvidia H100---2022/06/19 06:56 PM
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                                    Mac Pro with Nvidia H100anon52022/06/20 08:41 AM
                                      Mac Pro with Nvidia H100Sam G2022/06/20 07:22 PM
                                    Mac Pro with Nvidia H100Sam G2022/06/20 07:13 PM
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                                        Mac Pro with Nvidia H100Sam G2022/06/22 12:06 AM
                                          Mac Pro with Nvidia H100Doug S2022/06/22 09:18 AM
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                        Quick aside: huge pages also useful for nested page tables (virtualization)---2022/06/18 10:16 AM
          Not this nonsense againAnon2022/06/16 03:06 PM
            Parallel video encodingWes Felter2022/06/16 04:57 PM
              Parallel video encodingDummond D. Slow2022/06/16 07:16 PM
                Parallel video encodingWes Felter2022/06/16 07:49 PM
              Parallel video encoding---2022/06/16 07:41 PM
                Parallel video encodingDummond D. Slow2022/06/16 10:08 PM
                  Parallel video encoding---2022/06/16 11:03 PM
                    Parallel video encodingDummond D. Slow2022/06/17 07:45 AM
            Not this nonsense againjoema2022/06/16 09:13 PM
              Not this nonsense again---2022/06/16 11:18 PM
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      M2 benchmarks-DDR4 vs DDR5Doug S2022/06/16 09:58 AM
        M2 benchmarks-DDR4 vs DDR5Rayla2022/06/16 11:58 AM
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