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logicsrc/docs/openstream/reports/2026-09-13-nixamp-0.24.2-synthetic.json
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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{
"schema": 1,
"spec": "openstream",
"specVersion": "NXS1",
"generatedAt": "2026-09-13T09:48:49.844Z",
"implementation": {
"name": "nixamp",
"version": "0.24.2"
},
"environment": {
"runtime": "node v24.20.0",
"zstd": "1.5.7",
"zlib": "1.3.2.1-motley-42c2f19",
"os": "linux 6.17.0-1022-azure",
"arch": "x64",
"cpu": "INTEL(R) XEON(R) PLATINUM 8573C",
"cores": 4,
"memoryGiB": 15.6
},
"envelope": {
"magic": "NXS1",
"streamHeaderBytes": 16,
"frameHeaderBytes": 48
},
"policy": {
"minSavingsPercent": 3,
"minSavingsBytes": 512,
"maxBlockBytes": 262144,
"zstdLevels": [
1,
3,
9
]
},
"samples": [
{
"sample": "random-1mib",
"kind": "synthetic",
"inputBytes": 1048576,
"sha256": "562a223dca6ae12049e4e88ded6b6c0c7d18f29d5b941309fcd1f5cc19bc15b0",
"container": "bytes",
"rows": [
{
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"blocks": 4,
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"wireBytes": 1048832,
"storedBlocks": 4,
"compressedBlocks": 0,
"savingsPercent": -0.02,
"encodeMs": 0,
"decodeMs": 0,
"roundTrip": true
},
{
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"encodeMs": 24.17,
"decodeMs": 0,
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},
{
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"encodeMs": 7.11,
"decodeMs": 0,
"roundTrip": true
},
{
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"decodeMs": 0,
"roundTrip": true
},
{
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"storedBlocks": 4,
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"savingsPercent": -0.02,
"encodeMs": 12.7,
"decodeMs": 0,
"roundTrip": true
},
{
"mode": "ts-zstd",
"level": 1,
"blocks": 1,
"inputBytes": 1048576,
"payloadBytes": 0,
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"storedBlocks": 0,
"compressedBlocks": 0,
"savingsPercent": 99.99,
"encodeMs": 0,
"decodeMs": 0,
"roundTrip": false,
"note": "not a transport stream: ts-zstd does not apply"
}
],
"recommendation": {
"mode": "stored",
"level": 0,
"reason": "no codec beat stored by the configured margin"
}
},
{
"sample": "zeros-1mib",
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"sha256": "30e14955ebf1352266dc2ff8067e68104607e750abb9d3b36582b8af909fcb58",
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},
{
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},
{
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"roundTrip": true
},
{
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"roundTrip": true
},
{
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"decodeMs": 3.52,
"roundTrip": true
},
{
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"storedBlocks": 0,
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"encodeMs": 0,
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"roundTrip": false,
"note": "not a transport stream: ts-zstd does not apply"
}
],
"recommendation": {
"mode": "zstd",
"level": 9,
"reason": "saves 99.97% of the complete wire size"
}
},
{
"sample": "text-repeat-1mib",
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"sha256": "d05bf128d112bfd591628a68880676f643191beeb91d1250ce8c98212bf6e464",
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},
{
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},
{
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{
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},
{
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},
{
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"encodeMs": 0,
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"roundTrip": false,
"note": "not a transport stream: ts-zstd does not apply"
}
],
"recommendation": {
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"level": 1,
"reason": "saves 99.95% of the complete wire size"
}
},
{
"sample": "ts-padded-50pct",
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"inputBytes": 752000,
"sha256": "fbbe8a14abcd5d36e40ccf8d5d80eca805580cccd632842a4f1cea9461863a6d",
"container": "mpegts",
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},
{
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"roundTrip": true
},
{
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},
{
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},
{
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},
{
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}
],
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"reason": "saves 50.04% of the complete wire size"
}
},
{
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"kind": "synthetic",
"inputBytes": 752000,
"sha256": "675352f64a65d9ec2c3d7b69f11bb253cd882c3fcea85dd4a994675b5767c2c5",
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},
{
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},
{
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},
{
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"decodeMs": 0,
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},
{
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},
{
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}
],
"recommendation": {
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}
},
{
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{
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},
{
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},
{
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},
{
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},
{
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}
],
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"reason": "no codec beat stored by the configured margin"
}
},
{
"sample": "empty",
"kind": "synthetic",
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"sha256": "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855",
"container": "bytes",
"rows": [
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},
{
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},
{
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"roundTrip": true
},
{
"mode": "zstd",
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"roundTrip": true
},
{
"mode": "zstd",
"level": 9,
"blocks": 0,
"inputBytes": 0,
"payloadBytes": 0,
"wireBytes": 64,
"storedBlocks": 0,
"compressedBlocks": 0,
"savingsPercent": 0,
"encodeMs": 0,
"decodeMs": 0,
"roundTrip": true
},
{
"mode": "ts-zstd",
"level": 1,
"blocks": 0,
"inputBytes": 0,
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"wireBytes": 64,
"storedBlocks": 0,
"compressedBlocks": 0,
"savingsPercent": 0,
"encodeMs": 0,
"decodeMs": 0,
"roundTrip": true
}
],
"recommendation": {
"mode": "stored",
"level": 0,
"reason": "no codec beat stored by the configured margin"
}
}
],
"summary": {
"corpusBytes": 4649731,
"byMode": [
{
"mode": "stored",
"level": 0,
"wireBytes": 4651091,
"savingsPercent": -0.03,
"roundTrip": true,
"encodeMs": 0,
"decodeMs": 0
},
{
"mode": "gzip",
"level": 6,
"wireBytes": 2185882,
"savingsPercent": 52.99,
"roundTrip": true,
"encodeMs": 57.09,
"decodeMs": 10.94
},
{
"mode": "zstd",
"level": 1,
"wireBytes": 2180173,
"savingsPercent": 53.11,
"roundTrip": true,
"encodeMs": 14.55,
"decodeMs": 9.62
},
{
"mode": "zstd",
"level": 3,
"wireBytes": 2178281,
"savingsPercent": 53.15,
"roundTrip": true,
"encodeMs": 12.8,
"decodeMs": 8.59
},
{
"mode": "zstd",
"level": 9,
"wireBytes": 2178204,
"savingsPercent": 53.15,
"roundTrip": true,
"encodeMs": 53.79,
"decodeMs": 8.85
},
{
"mode": "ts-zstd",
"level": 1,
"wireBytes": 1127952,
"savingsPercent": 25,
"roundTrip": true,
"encodeMs": 9.27,
"decodeMs": 4.87
}
]
},
"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."
]
}
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