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logicsrc/docs/openstream/reports/2026-09-13-nixamp-0.24.2-synthetic.md
Anthony Ettinger fd25e8e4ba
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docs: OpenStream benchmark report for nixamp 0.24.2 (#184) 
Manual publish of the report attached to the nixamp v0.24.2 release
(openstream-report-0.24.2.json/.md). The release workflow's
publish-report job skipped because LOGICSRC_PUBLISH_TOKEN is not set
on profullstack/nixamp. Built-in synthetic corpus, so the id carries
the -synthetic label per docs/openstream/reports/README.md.


Claude-Session: https://claude.ai/code/session_015uheT4Gn9BBKAnSZGcabyN

Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>
2026-09-13 05:16:24 -07:00

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OpenStream benchmark — nixamp 0.24.2

Generated 2026-09-13T09:48:49.844Z · envelope NXS1 · schema 1

Environment. node v24.20.0, zstd 1.5.7, zlib 1.3.2.1-motley-42c2f19, on linux 6.17.0-1022-azure x64, 4× INTEL(R) XEON(R) PLATINUM 8573C, 15.6 GiB.

Policy. block 262144 B; eligible at 3% and 512 B; zstd levels 1, 3, 9.

Corpus

sample kind bytes container best mode saves
random-1mib synthetic 1048576 bytes stored stored
zeros-1mib synthetic 1048576 bytes zstd L9 99.97%
text-repeat-1mib synthetic 1048576 bytes zstd L1 99.95%
ts-padded-50pct synthetic 752000 mpegts ts-zstd L1 50.04%
ts-unpadded synthetic 752000 mpegts stored stored
tiny-3b synthetic 3 bytes stored stored
empty synthetic 0 bytes stored stored

Aggregate, per mode across the corpus

mode wire bytes saving enc ms dec ms round trip
stored 4651091 -0.03% 0 0 ok
gzip L6 2185882 +52.99% 57.09 10.94 ok
zstd L1 2180173 +53.11% 14.55 9.62 ok
zstd L3 2178281 +53.15% 12.8 8.59 ok
zstd L9 2178204 +53.15% 53.79 8.85 ok
ts-zstd L1 1127952 +25% 9.27 4.87 ok

Caveats

  • Envelope v1: a 16-byte stream header, a 48-byte header per frame, plus one end frame.
  • OpenStream is a framing envelope over Zstandard and gzip, not a new compression algorithm; these numbers are those codecs at the block boundary, honestly framed.
  • Synthetic samples do not predict production savings. A padded transport stream flatters a codec by its padding; an efficient real feed saves far less. Use --corpus with authorized real samples for numbers that mean something.
  • Timings are wall-clock on the machine and runtime named in environment and do not transfer to other hardware.
  • roundTrip:false in any row is a failure of exactness and must block a release.