The Snappy compression format in the Go programming language.
Go · AssemblyBSD-3-Clause★ 1,569 stars⑂ 168 forkssince May 2015View on GitHub ↗
golang/snappy holds a health index of 48 out of 100, placing it in the At risk band. It scores highest on Community & Adoption (66/100) and lowest on Engineering Quality (30/100). It was last updated 12 days ago. A single contributor accounts for most of its recent work.
48
overall / 100
At risk
Software health index
Metrics are grouped into weighted categories on one standardized 1–100 scale. Overall starts as their weighted mean; when public evidence triggers the High-Risk Jurisdiction Policy, the rating is adjusted and receives an At risk ceiling of 49. AI Readiness sits outside the overall score.
48
Excellent85-100Exemplary; meets essentially all checked criteria
Good70-84Healthy; minor gaps
Moderate50-69Acceptable with notable gaps; review recommended
At risk30-49Significant weaknesses; adoption warrants caution
Critical1-29Severe problems (abandoned, single-maintainer, no hygiene)
Score profile
Each axis is a category. The shape matters more than the average — a healthy subject fills the whole shape, while a spike-and-crater profile means strength in one dimension is masking risk in another.
Excluded from scoring (no data or not applicable): branch_protection, dangerous_workflow, packaging, pinned_dependencies, signed_releases, token_permissions. Remaining weights renormalized.
How well is the repo equipped to be developed and maintained with AI coding agents? An independent, experimental badge — weight 0.0, so it is surfaced on its own and does not affect the overall health score.
Manageable file sizes — 0/11 source files over 60KB
Inputs used
primary_language
Go
largest_source_bytes
45,089
source_files_sampled
11
oversized_source_files
0
Key facts
1,569GitHub stars
16contributors
2commits, last 12 months
12days since last push
1releases
1bus factor
13open issues
Gopackage ecosystems
Data collection warnings
Star history unavailable: GitHub GraphQL error: Resource not accessible by personal access token
More detail
Star and fork history 0 ★ / 168 ⇿
0Stars
168Forks
1Releases
When each star and fork was added, collected from GitHub and bucketed by day. Cumulative growth sits directly above the daily additions it is made of, so the two read against each other: steady organic accretion looks nothing like an abrupt, short-lived burst. Where that difference is measurable, it is reported as growth authenticity.
Major 1Minor 0Patch 0
Each point covers 11 days.
OpenSSF Scorecard 4.4 / 10
4.4aggregate
Independent, tool-agnostic security assessment from the open-source OpenSSF Scorecard. Each check rewards a security practice, not a specific vendor's tool. Checks Scorecard could not determine are marked n/a and excluded from the security score (never counted as zero).Scorecard v5.5.0 · 2026-07-28 13:24 UTC
Full resolved dependency set from the GitHub dependency graph: 0 direct and 0 indirect (transitive) packages. The transitive closure is complete when the repository commits a lockfile.
Registry
Package
Version
Relation
Dependency advisories not assessed
Advisory matching could not run for this report: No resolved dependencies to assess
Raw JSON report machine-readable
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"headline": "Merge pull request #77 from eustas/limitVarInt",
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"body": "- Add instructions for using `go install` to run the binary.\n- Note that `go get` is only for use as a library.",
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"headline": "Fix dangling golden_test filename link",
"author_name": "Nigel Tao",
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"body": "Add ReadByte method, satisfies the io.ByteReader interface",
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"headline": "Merge pull request #51 from topos-ai/bytereader",
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"body": "correct spelling mistake",
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"headline": "Merge pull request #40 from EdwardBetts/spelling",
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"body": "Use a more inclusive text for golden input.",
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"headline": "Merge pull request #60 from alexlegg/master",
"author_name": "Nigel Tao",
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"oid": "33fc3d5d8d990c6bccaf4da1d7bb661e0cc53cb6",
"body": "…gister-format\n\nFix wrong arm64 scaled register format",
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"headline": "Merge pull request #61 from cuonglm/cuonglm/fix-wrong-arm64-scaled-re…",
"author_name": "Nigel Tao",
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"oid": "b46926bc8ad2fbf12e5cd0170b33bd762fd9c1f4",
"body": "Arm64 does not have scaled register format, casue snappy test failed for\ncurrent go tip:\n\n\t$ go version\n\tgo version devel go1.17-24875e3880 Tue Apr 20 15:14:05 2021 +0000 darwin/arm64\n\t$ go test\n\t# github.com/golang/snappy\n\t./encode_arm64.s:385: arm64 doesn't support scaled register format\n\t./encode_arm64.s:675: arm64 doesn't support scaled register format\n\tasm: assembly of ./encode_arm64.s failed\n\tFAIL\tgithub.com/golang/snappy [build failed]\n\nSee https://go-review.googlesource.com/c/go/+/289589",
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"headline": "Fix wrong arm64 scaled register format",
"author_name": "Cuong Manh Le",
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"oid": "e149cdd03f0f703a5b8f534b403225522e087412",
"body": "Replace the first chapter of Tom Sawyer with the first 400 lines of\nIsaac Newton's Opticks.\n\nThe rawsnappy version was generated by cmd/snappytool in this repo.\n\nThe extendMatch test goldens were updated as per the instructions in\ngolden_test.go (with an update to account for the golang version of\nextendMatch being inlined.)",
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"headline": "Use a more inclusive text for golden input.",
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"body": "bug fix to encode_arm64.s: some registers overwritten in memmove call\r\n\r\nARM64 memmove clobbers R16 and R17 as of\r\nhttps://go-review.googlesource.com/c/go/+/243357",
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"headline": "Merge pull request #56 from AWSjswinney/arm64-port-pr",
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"body": "In encode_arm64.s, encodeBlock, two of the registers added during the port from\namd64 were not saved or restored for the memmove call. Instead of saving them,\njust recalculate their values. Additionally, I made a few small changes to\nimprove things since I've learned a bit more about ARMv8 assembly.\n[…]\n 620µs ± 1% 621µs ± 4% ~ (p=0.173 n=8+10)\n_ZFlat11-4 1.94ms ± 0% 1.93ms ± 0% -0.52% (p=0.001 n=9+8)\nExtendMatch-4 69.3µs ± 2% 69.2µs ± 0% ~ (p=0.515 n=10+8)",
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"headline": "bug fix to encode_arm64.s: some registers overwritten in memmove call",
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"headline": "Merge pull request #53 from AWSjswinney/arm64-port-pr",
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"body": "This change was produced by taking the amd64 assembly and reproducing it\nas closely as possible for the arm64 arch.\n\nThe main differences:\n - arm64 uses registers R1-R17 which are mapped directly onto an amd64\n counterpart\n - arm64 requires 8 additional bytes of stack so callee args are displaced\n\n[…]\n% 247MB/s ± 0% +98.90% (p=0.000 n=10+10)\n_ZFlat10-2 350MB/s ± 0% 967MB/s ± 3% +176.44% (p=0.000 n=10+10)\n_ZFlat11-2 189MB/s ± 0% 426MB/s ± 0% +124.65% (p=0.000 n=10+10)",
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"headline": "port amd64 assembly to arm64",
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"headline": "Add comments re handling block and stream formats",
"author_name": "Nigel Tao",
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"headline": "A+C: add Klaus Post <klauspost@gmail.com>.",
"author_name": "Nigel Tao",
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"oid": "c9879f99e6b406abe831130b642c21396628ece3",
"body": "Use faster copy when not overlapping",
"is_bot": false,
"headline": "Merge pull request #48 from klauspost/use-copy-for-non-overlapping",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
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"oid": "5610373d2fa9862fd75fbf3edbc8a31b539ad41a",
"body": "Faster overlapping copies",
"is_bot": false,
"headline": "Merge pull request #49 from klauspost/faster-overlapping-copies",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
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"body": "Eliminates bounds check on every byte copied.\n\nBenchmark measured on AMD64 but with `-tags=noasm`:\n\n```\n>benchstat old.txt new.txt\nname old time/op new time/op delta\n_UFlat0-8 194µs ± 3% 150µs ± 2% -22.59% (p=0.000 n=10+10)\n_UFlat1-8 1.62ms ± 1% 1.41ms ± 2% -12.70% \n[…]\n 249MB/s ± 1% 263MB/s ± 2% +5.76% (p=0.000 n=10+9)\n_UFlat10-8 637MB/s ± 2% 862MB/s ± 5% +35.25% (p=0.000 n=10+10)\n_UFlat11-8 352MB/s ± 2% 385MB/s ± 3% +9.51% (p=0.000 n=10+10)\n```",
"is_bot": false,
"headline": "Faster overlapping copies",
"author_name": "Klaus Post",
"author_login": "klauspost",
"committed_at": "2019-09-01T17:55:24Z",
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"oid": "efb0d863a3fb34cbc654818daa8ce61181d51af6",
"body": "Use the built-in copy function when the source doesn't overlap the destination.\n\nAgain benchmarks are a bit polarized based on how often this is the case, but should be a solid improvement for all non-amd64 users.\n\nBenchmark measured on AMD64 but with `-tags=noasm`:\n\n```\n>benchstat old.txt new.txt\n\n[…]\n=10+10)\n_UFlat10-8 637MB/s ± 2% 1162MB/s ± 2% +82.29% (p=0.000 n=10+10)\n_UFlat11-8 352MB/s ± 2% 361MB/s ± 1% +2.62% (p=0.000 n=10+8)\n```\n\nCo-Authored-By: Nigel Tao <nigeltao@golang.org>",
"is_bot": false,
"headline": "Use faster copy when not overlapping",
"author_name": "Klaus Post",
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"oid": "2a8bb927dd31d8daada140a5d09578521ce5c36a",
"body": "Add a go.mod file for basic Go modules support.",
"is_bot": false,
"headline": "Merge pull request #46 from creachadair/gomod",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2019-02-18T23:22:22Z",
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"oid": "f05e7a5086fed27f3b02816f732ade183bb0f9e1",
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"headline": "Add a go.mod file for basic Go modules support.",
"author_name": "M. J. Fromberger",
"author_login": "creachadair",
"committed_at": "2019-02-11T21:35:28Z",
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"oid": "2e65f85255dbc3072edf28d6b5b8efc472979f5a",
"body": "The key difference is replacing snappy.NewWriter and snappy.NewReader\nwith snappy.Encode and snappy.Decode.\n\nThis change restores the behavior of the previous (written in C)\nsnappytool program.",
"is_bot": false,
"headline": "Fix snappytool to use block, not stream, format",
"author_name": "Nigel Tao",
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"oid": "e45cd318e0c1612dbf7e2a5644c9d213fc8894f4",
"body": "rewrite snappytool in go",
"is_bot": false,
"headline": "Merge pull request #38 from mattn/cmd-snappytool",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2018-05-18T05:18:59Z",
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"oid": "da2bb3382a3962f48760e59434c9de82ff9f66a5",
"body": null,
"is_bot": false,
"headline": "correct spelling mistake",
"author_name": "Edward Betts",
"author_login": "EdwardBetts",
"committed_at": "2017-09-01T11:38:27Z",
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"oid": "35a8406c2110ed6d335c26bec02c0efe4d24b53b",
"body": null,
"is_bot": false,
"headline": "rewrite snappytool in go",
"author_name": "Yasuhiro Matsumoto",
"author_login": "mattn",
"committed_at": "2017-03-28T12:05:51Z",
"body_truncated": false,
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"oid": "553a641470496b2327abcac10b36396bd98e45c9",
"body": "fix typo",
"is_bot": false,
"headline": "Merge pull request #37 from fatedier/master",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2017-02-15T23:32:05Z",
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"oid": "0d9c4c05f138df50573330060c3317a9b36387ae",
"body": null,
"is_bot": false,
"headline": "fix typo",
"author_name": "fatedier",
"author_login": "fatedier",
"committed_at": "2017-01-25T07:07:54Z",
"body_truncated": false,
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{
"oid": "7db9049039a047d955fe8c19b83c8ff5abd765c7",
"body": "Run gofmt.",
"is_bot": false,
"headline": "Merge pull request #36 from sguiheux/gofmt",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2017-01-19T01:47:23Z",
"body_truncated": false,
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"oid": "5a0054d7b7e6dfeefcea1ee745dcae42c9680ac6",
"body": null,
"is_bot": false,
"headline": "fix: gofmt",
"author_name": "Steven Guiheux",
"author_login": "sguiheux",
"committed_at": "2017-01-18T10:51:53Z",
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"oid": "d9eb7a3d35ec988b8585d4a0068e462c27d28380",
"body": "It is a valid encoding, even if no longer issued by most encoders.\n\nname old speed new speed delta\nWordsDecode1e1-8 525MB/s ± 0% 504MB/s ± 1% -4.04% (p=0.000 n=9+10)\nWordsDecode1e2-8 1.23GB/s ± 0% 1.23GB/s ± 1% ~ (p=0.678 n=10+9)\nWordsDecode1e3-8 1.54GB/s ± 0\n[…]\n8MB/s ± 0% 327MB/s ± 1% ~ (p=0.409 n=8+9)\n_ZFlat10-8 1.33GB/s ± 0% 1.33GB/s ± 1% ~ (p=0.356 n=9+10)\n_ZFlat11-8 605MB/s ± 0% 605MB/s ± 1% ~ (p=0.743 n=9+8)",
"is_bot": false,
"headline": "Support the COPY_4 tag.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-05-29T05:00:41Z",
"body_truncated": true,
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},
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"oid": "d6668316e43571d7dde95be6fd077f96de002f8b",
"body": null,
"is_bot": false,
"headline": "Fix BenchmarkExtendMatch to honor the testdata flag.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-05-19T03:34:20Z",
"body_truncated": false,
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},
{
"oid": "d7b1e156f50d3c4664f683603af70e3e47fa0aa2",
"body": null,
"is_bot": false,
"headline": "Add a benchdataDir flag.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-05-04T22:17:12Z",
"body_truncated": false,
"is_coding_agent": false
},
{
"oid": "aefa7ba4ef3005262bc58a868df27fe6c7ff2359",
"body": "Some build environments need to specify their own testdata dir.",
"is_bot": false,
"headline": "Re-add the testdata flag.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-05-04T21:48:01Z",
"body_truncated": false,
"is_coding_agent": false
},
{
"oid": "43fea289edce21979658cbbdb3925390890aa86e",
"body": "Fixes #32.",
"is_bot": false,
"headline": "Remove the snappy.test binary, inadvertently checked in.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-04-29T23:02:19Z",
"body_truncated": false,
"is_coding_agent": false
},
{
"oid": "b62d312cd2a7474ccb7eb06a4686f0560e4ba7fb",
"body": null,
"is_bot": false,
"headline": "Add some benchmark numbers to the README.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-04-29T05:28:03Z",
"body_truncated": false,
"is_coding_agent": false
},
{
"oid": "dfb3612ba2a044dad98f8b170d2f718467c30691",
"body": "Compared to the previous commit:\nname old speed new speed delta\nWordsEncode1e1-8 701MB/s ± 0% 699MB/s ± 1% ~ (p=0.123 n=10+10)\nWordsEncode1e2-8 460MB/s ± 0% 583MB/s ± 1% +26.64% (p=0.000 n=10+10)\nWordsEncode1e3-8 480MB/s ± 0% 647MB/s ± 2% +34.85% (p=0.0\n[…]\n/s ± 1% 329MB/s ± 0% +33.58% (p=0.000 n=10+9)\n_ZFlat10-8 1.05GB/s ± 1% 1.35GB/s ± 1% +28.35% (p=0.000 n=10+9)\n_ZFlat11-8 411MB/s ± 0% 608MB/s ± 0% +47.82% (p=0.000 n=10+9)",
"is_bot": false,
"headline": "Inline the extendMatch call.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-04-29T04:24:51Z",
"body_truncated": true,
"is_coding_agent": false
},
{
"oid": "c707890a477a74edb4e53dde84613abf3ad29c5d",
"body": "This minimizes the diff in a follow-up commit, when manually inlining.\n\nIt's not an optimization per se, but for the record:\nname old speed new speed delta\nWordsEncode1e1-8 700MB/s ± 1% 701MB/s ± 0% ~ (p=0.393 n=10+10)\nWordsEncode1e2-8 460MB/s ± 1% 460MB/s ± 0% \n[…]\n new time/op delta\nExtendMatch-8 7.92µs ± 2% 7.80µs ± 2% -1.51% (p=0.002 n=10+9)\nand note that this is time/op instead of MB/s, so negative is better,\nalthough it's quite possibly all just noise.",
"is_bot": false,
"headline": "Rearrange the extendMatch register allocation.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-04-29T04:11:06Z",
"body_truncated": true,
"is_coding_agent": false
},
{
"oid": "5a44a9da2110bee7a93f552127af8a74bad44fe8",
"body": "name old speed new speed delta\nWordsEncode1e1-8 712MB/s ± 1% 700MB/s ± 1% -1.65% (p=0.000 n=10+10)\nWordsEncode1e2-8 467MB/s ± 0% 460MB/s ± 1% -1.53% (p=0.000 n=9+10)\nWordsEncode1e3-8 483MB/s ± 0% 478MB/s ± 2% -0.98% (p=0.007 n=9+10)\nWordsEncode1e4-8 35\n[…]\n/s ± 1% 273MB/s ± 0% ~ (p=0.280 n=10+10)\n_ZFlat10-8 1.12GB/s ± 1% 1.17GB/s ± 1% +4.12% (p=0.000 n=10+10)\n_ZFlat11-8 460MB/s ± 0% 461MB/s ± 0% +0.34% (p=0.006 n=8+10)",
"is_bot": false,
"headline": "Inline the emitLiteral call.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-04-29T03:20:53Z",
"body_truncated": true,
"is_coding_agent": false
},
{
"oid": "c3defccc353d53ff7091dba7a646f482bf15dc98",
"body": "name old speed new speed delta\nWordsEncode1e1-8 701MB/s ± 1% 712MB/s ± 1% +1.64% (p=0.000 n=10+10)\nWordsEncode1e2-8 429MB/s ± 0% 467MB/s ± 0% +8.86% (p=0.000 n=9+9)\nWordsEncode1e3-8 447MB/s ± 0% 483MB/s ± 0% +8.20% (p=0.000 n=9+9)\nWordsEncode1e4-8 32\n[…]\n/s ± 1% 273MB/s ± 1% +10.90% (p=0.000 n=10+10)\n_ZFlat10-8 1.05GB/s ± 1% 1.12GB/s ± 1% +7.02% (p=0.000 n=10+10)\n_ZFlat11-8 411MB/s ± 0% 460MB/s ± 0% +11.79% (p=0.000 n=10+8)",
"is_bot": false,
"headline": "Inline the emitCopy call.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-04-29T02:54:56Z",
"body_truncated": true,
"is_coding_agent": false
},
{
"oid": "598d84db771ebc0ceb3b0bc4ae62c8d09a73c6ba",
"body": "This minimizes the diff in a follow-up commit, when manually inlining.\n\nIt's not an optimization per se, but for the record:\nname old speed new speed delta\nWordsEncode1e1-8 698MB/s ± 1% 701MB/s ± 1% ~ (p=0.165 n=10+10)\nWordsEncode1e2-8 428MB/s ± 0% 429MB/s ± 0% \n[…]\n 246MB/s ± 1% 246MB/s ± 1% ~ (p=0.921 n=9+10)\n_ZFlat10-8 1.05GB/s ± 1% 1.05GB/s ± 1% ~ (p=0.089 n=10+10)\n_ZFlat11-8 410MB/s ± 0% 411MB/s ± 0% ~ (p=0.190 n=10+10)",
"is_bot": false,
"headline": "Rearrange the emitLiteral register allocation.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-04-29T02:00:38Z",
"body_truncated": true,
"is_coding_agent": false
},
{
"oid": "9f7b278fd78696f07ce25b6941fd896e50870f40",
"body": "This minimizes the diff in a follow-up commit, when manually inlining.\n\nIt's not an optimization per se, but for the record:\nname old speed new speed delta\nWordsEncode1e1-8 711MB/s ± 1% 700MB/s ± 1% -1.64% (p=0.000 n=9+10)\nWordsEncode1e2-8 407MB/s ± 1% 430MB/s ± 0% \n[…]\n7MB/s ± 1% 247MB/s ± 0% ~ (p=0.465 n=8+9)\n_ZFlat10-8 1.03GB/s ± 0% 1.05GB/s ± 1% +1.75% (p=0.000 n=9+9)\n_ZFlat11-8 409MB/s ± 0% 412MB/s ± 0% +0.64% (p=0.000 n=8+8)",
"is_bot": false,
"headline": "Rearrange the emitCopy register allocation.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-04-29T01:22:44Z",
"body_truncated": true,
"is_coding_agent": false
},
{
"oid": "2b29335120440273ce87e777e4d1d511fe7894b8",
"body": null,
"is_bot": false,
"headline": "Run asmfmt.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-04-29T01:06:33Z",
"body_truncated": false,
"is_coding_agent": false
},
{
"oid": "6ffc20e64ac443f023f8e1bb056e1ac5bba73ee5",
"body": null,
"is_bot": false,
"headline": "Add more comments for the asm workaround.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-04-29T00:31:32Z",
"body_truncated": false,
"is_coding_agent": false
},
{
"oid": "ec642410cd033af63620b66a91ccbd3c69c2c59a",
"body": "This asm phrase works on Go 1.4 and Go tip, but not Go 1.6. I'm not sure\nwhy, but this workaround should make the package installable while I\ninvestigate.\n\nFixes #29.",
"is_bot": false,
"headline": "Workaround \"table-32768(SP)(R11*2)\" not assembling.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-04-24T00:32:34Z",
"body_truncated": false,
"is_coding_agent": false
},
{
"oid": "7dddae14f78fa10091e879948a0ccf67b5acfc68",
"body": "Multiple \"end\" labels, in different functions, did not work with the Go\n1.4 toolchain.\n\nFixes #30.",
"is_bot": false,
"headline": "Fix redeclaration of \"end\" in the asm.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-04-24T00:07:12Z",
"body_truncated": false,
"is_coding_agent": false
},
{
"oid": "2dbf36527785b61dd460e053f008abafbce9380b",
"body": "This is a partial undo of 4f2f9a13 \"Write the encoder's extendMatch in\nasm\" but we can selectively apply the undo only to the noasm case now\nthat encodeBlock (the function that calls extendMatch) is itself written\nin asm.\n\nWith \"go test -test.bench='Encode|ZFlat' -tags=noasm\":\nname old \n[…]\n/s ± 0% 247MB/s ± 0% +41.02% (p=0.008 n=5+5)\n_ZFlat10-8 509MB/s ± 0% 1027MB/s ± 0% +101.72% (p=0.008 n=5+5)\n_ZFlat11-8 275MB/s ± 0% 411MB/s ± 0% +49.57% (p=0.008 n=5+5)",
"is_bot": false,
"headline": "Inline extendMatch for the noasm encoder.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-04-23T05:01:47Z",
"body_truncated": true,
"is_coding_agent": false
},
{
"oid": "988ce01844c82a01b918c35840520b91b398049e",
"body": "Compared to the previous commit:\nname old speed new speed delta\nWordsEncode1e1-8 667MB/s ± 0% 677MB/s ± 1% +1.57% (p=0.008 n=5+5)\nWordsEncode1e2-8 353MB/s ± 1% 428MB/s ± 0% +21.37% (p=0.008 n=5+5)\nWordsEncode1e3-8 383MB/s ± 1% 446MB/s ± 1% +16.65% (p=0.008 n\n[…]\n/s ± 0% 247MB/s ± 0% +22.17% (p=0.008 n=5+5)\n_ZFlat10-8 803MB/s ± 0% 1027MB/s ± 0% +27.93% (p=0.008 n=5+5)\n_ZFlat11-8 351MB/s ± 0% 411MB/s ± 0% +16.92% (p=0.008 n=5+5)",
"is_bot": false,
"headline": "Add a fast path for short emitLiteral calls.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-04-23T04:49:49Z",
"body_truncated": true,
"is_coding_agent": false
},
{
"oid": "45da9d9c0fa12c1d81bb7dcb799ffe9ca08c8e84",
"body": "Obviously, the biggest gains are for the smallest inputs.\n\nThe WordsEncode1e1-8 benchmark should be unaffected (except possibly by\nnoise) because it never calls into encodeBlock.\n\nname old speed new speed delta\nWordsEncode1e1-8 678MB/s ± 0% 667MB/s ± 0% -1.74% (p=0.0\n[…]\n/s ± 0% 231MB/s ± 0% +0.23% (p=0.032 n=5+5)\n_ZFlat10-8 970MB/s ± 0% 972MB/s ± 0% ~ (p=0.421 n=5+5)\n_ZFlat11-8 402MB/s ± 0% 401MB/s ± 0% ~ (p=0.730 n=5+5)",
"is_bot": false,
"headline": "Zero out only that part of the hash table in use.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-04-23T04:31:57Z",
"body_truncated": true,
"is_coding_agent": false
},
{
"oid": "68801229512d42e123097d5e505e89ea3f4397cc",
"body": "name old speed new speed delta\nWordsEncode1e1-8 665MB/s ± 0% 678MB/s ± 0% +2.00% (p=0.016 n=4+5)\nWordsEncode1e2-8 85.0MB/s ± 0% 90.1MB/s ± 0% +5.90% (p=0.016 n=4+5)\nWordsEncode1e3-8 234MB/s ± 2% 295MB/s ± 0% +26.20% (p=0.008 n=5+5)\nWordsEncode1e4-8 233MB/s \n[…]\n 202MB/s ± 0% 231MB/s ± 0% +14.13% (p=0.008 n=5+5)\n_ZFlat10-8 803MB/s ± 0% 970MB/s ± 0% +20.90% (p=0.008 n=5+5)\n_ZFlat11-8 351MB/s ± 0% 402MB/s ± 0% +14.29% (p=0.008 n=5+5)",
"is_bot": false,
"headline": "Write the encoder's encodeBlock in asm.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-04-23T04:21:06Z",
"body_truncated": true,
"is_coding_agent": false
},
{
"oid": "17e435849f9b5cc7818817bb6e1d5c002f486fef",
"body": "It's really just a style change, not an optimization, but for the\nrecord, the numbers don't show a strong change either way, and could\neasily just be noise.\n\nname old speed new speed delta\nWordsEncode1e1-8 667MB/s ± 0% 665MB/s ± 0% ~ (p=0.190 n=5+4)\nWordsEncode1e2-8\n[…]\n 202MB/s ± 0% 202MB/s ± 0% ~ (p=0.683 n=4+5)\n_ZFlat10-8 794MB/s ± 2% 803MB/s ± 0% +1.13% (p=0.008 n=5+5)\n_ZFlat11-8 350MB/s ± 0% 351MB/s ± 0% +0.25% (p=0.032 n=4+5)",
"is_bot": false,
"headline": "Restrict the scope of the tableSize variable.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-04-23T02:28:42Z",
"body_truncated": true,
"is_coding_agent": false
},
{
"oid": "0c43e98dfe3f41a99362fa041990a047da508eee",
"body": null,
"is_bot": false,
"headline": "Add comment that dst and src must not overlap.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-04-23T02:17:41Z",
"body_truncated": false,
"is_coding_agent": false
},
{
"oid": "62bb72da9a2bbb2139731f3da2659852bd15df18",
"body": "name old speed new speed delta\nWordsEncode1e1-8 665MB/s ± 0% 667MB/s ± 0% +0.35% (p=0.008 n=5+5)\nWordsEncode1e2-8 83.8MB/s ± 1% 85.1MB/s ± 0% +1.47% (p=0.008 n=5+5)\nWordsEncode1e3-8 231MB/s ± 1% 235MB/s ± 0% +1.81% (p=0.008 n=5+5)\nWordsEncode1e4-8 232MB/s ± 1\n[…]\n 200MB/s ± 0% 202MB/s ± 0% +0.95% (p=0.016 n=5+4)\n_ZFlat10-8 797MB/s ± 0% 794MB/s ± 2% ~ (p=1.000 n=5+5)\n_ZFlat11-8 351MB/s ± 1% 350MB/s ± 0% ~ (p=0.730 n=5+4)",
"is_bot": false,
"headline": "Write the encoder's emitLiteral in asm.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-04-23T02:05:56Z",
"body_truncated": true,
"is_coding_agent": false
},
{
"oid": "d8211ff0ee1575ab421cd4b9504bfe1d7c7d7f76",
"body": "name old speed new speed delta\nWordsEncode1e1-8 690MB/s ± 0% 665MB/s ± 0% -3.64% (p=0.008 n=5+5)\nWordsEncode1e2-8 83.7MB/s ± 1% 83.8MB/s ± 1% ~ (p=0.421 n=5+5)\nWordsEncode1e3-8 230MB/s ± 1% 231MB/s ± 1% ~ (p=0.421 n=5+5)\nWordsEncode1e4-8 233MB/s ± 1\n[…]\n(p=0.056 n=5+5)\n\nI'm not overly worried about the WordsEncode1e1-8 change: the time/op is\naround 15 nanoseconds, which is tiny. In comparison, _ZFlat0-8 takes\naround 163 microseconds (note µs not ns).",
"is_bot": false,
"headline": "Write the encoder's emitCopy in asm.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-04-23T01:48:21Z",
"body_truncated": true,
"is_coding_agent": false
},
{
"oid": "4f2f9a13dd7ed6975c4470af560e8ff2f93b127d",
"body": "name old speed new speed delta\nWordsEncode1e1-8 678MB/s ± 0% 690MB/s ± 0% +1.79% (p=0.008 n=5+5)\nWordsEncode1e2-8 87.5MB/s ± 0% 83.7MB/s ± 1% -4.26% (p=0.008 n=5+5)\nWordsEncode1e3-8 257MB/s ± 1% 230MB/s ± 1% -10.41% (p=0.008 n=5+5)\nWordsEncode1e4-8 247MB/s \n[…]\n=0.008 n=5+5)\n_ZFlat11-8 278MB/s ± 0% 348MB/s ± 0% +25.09% (p=0.008 n=5+5)\n\nname old time/op new time/op delta\nExtendMatch-8 16.5µs ± 1% 7.8µs ± 1% -52.93% (p=0.008 n=5+5)",
"is_bot": false,
"headline": "Write the encoder's extendMatch in asm.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-04-23T01:26:04Z",
"body_truncated": true,
"is_coding_agent": false
},
{
"oid": "1f4d362d6d1f2f31bf10a5a7075f021dea6a225d",
"body": "This allows deleting some redundant code.\n\nname old speed new speed delta\nWordsEncode1e1-8 679MB/s ± 0% 678MB/s ± 0% ~ (p=0.087 n=5+5)\nWordsEncode1e2-8 87.5MB/s ± 0% 87.5MB/s ± 0% ~ (p=0.579 n=5+5)\nWordsEncode1e3-8 258MB/s ± 0% 257MB/s ± 1% ~ (p=\n[…]\n 175MB/s ± 0% 175MB/s ± 0% ~ (p=0.095 n=5+5)\n_ZFlat10-8 507MB/s ± 0% 507MB/s ± 0% ~ (p=0.222 n=5+5)\n_ZFlat11-8 277MB/s ± 0% 278MB/s ± 0% +0.38% (p=0.008 n=5+5)",
"is_bot": false,
"headline": "Clarify the emitLiteral and emitCopy preconditions.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-04-23T00:40:18Z",
"body_truncated": true,
"is_coding_agent": false
},
{
"oid": "bd94318f58a5b6f6c8af0f67bb1788c8d2d530a3",
"body": null,
"is_bot": false,
"headline": "Add some more encoder tests.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-04-23T00:29:32Z",
"body_truncated": false,
"is_coding_agent": false
},
{
"oid": "774a97396f7bfa4165e9dcf4bfa0747ea3edcc02",
"body": "It was no longer used as of commit 8939696c \"Use the same encoding\nalgorithm as C++ snappy\".",
"is_bot": false,
"headline": "Remove the no-longer-used maxOffset constant.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-04-16T05:15:34Z",
"body_truncated": false,
"is_coding_agent": false
},
{
"oid": "3588d1dd84953d8f7effbfbde1fe352cfdf13c65",
"body": "The general suggestion to use a noasm tag is by Klaus Post at\nhttps://groups.google.com/d/msg/golang-dev/CeKX81B3WdQ/2mq-eY0VAgAJ",
"is_bot": false,
"headline": "Add appengine and noasm build tags.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-04-14T08:47:10Z",
"body_truncated": false,
"is_coding_agent": false
},
{
"oid": "fa0b0e6289e9a08f133cb431fc5fca8e2265767c",
"body": "It seems like a small win:\n\nbenchmark old MB/s new MB/s speedup\nBenchmarkWordsEncode1e1-4 465.69 471.77 1.01x\nBenchmarkWordsEncode1e2-4 60.18 60.27 1.00x\nBenchmarkWordsEncode1e3-4 174.42 176.26 1.01x\nBenchmarkWordsEncode1e\n[…]\n47 1.01x\nBenchmark_ZFlat9-4 125.40 125.85 1.00x\nBenchmark_ZFlat10-4 364.30 370.35 1.02x\nBenchmark_ZFlat11-4 200.04 199.80 1.00x",
"is_bot": false,
"headline": "Eliminate some bounds checks.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-04-12T00:37:28Z",
"body_truncated": true,
"is_coding_agent": false
},
{
"oid": "ef80b33e873821cff33038ae16c444717218cdb1",
"body": "Doing s/int32/uint16/ in \"var table [maxTableSize]int32\" saves 32 KiB of stack\nspace that needed zero'ing. maxTableSize is 1<<14, or 16384.\n\nWe couldn't do this before, in commit cc71ae7c, since we didn't have\nmaxBlockSize = 65536 at the time.\n\nbenchmark old MB/s new MB/s \n[…]\n61 1.02x\nBenchmark_ZFlat9-4 121.73 125.62 1.03x\nBenchmark_ZFlat10-4 360.89 365.62 1.01x\nBenchmark_ZFlat11-4 195.92 199.96 1.02x",
"is_bot": false,
"headline": "Change the encoder's hash table values from int32 to uint16.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-04-11T02:06:28Z",
"body_truncated": true,
"is_coding_agent": false
},
{
"oid": "70f093abd7c11f120162d8f77684deadbe37bbf2",
"body": "The testdata/Mark.Twain-Tom.Sawyer.txt file is the first chapter of the\nsrc/compress/testdata/Mark.Twain-Tom.Sawyer.txt file in the Go repo.\n\nThe rawsnappy version was generated by cmd/snappytool in this repo,\nusing the C++ snappy library as of commit d53de187 (2016-04-05).",
"is_bot": false,
"headline": "Use a more compressible golden input for the tests.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-04-10T06:29:43Z",
"body_truncated": false,
"is_coding_agent": false
},
{
"oid": "9bc0b5ad10791df6db28196b243094a7694ef806",
"body": "This is the Go equivalent of an algorithmic change in the C++ snappy\ncode:\nhttps://github.com/google/snappy/commit/d53de18799418e113e44444252a39b12a0e4e0cc\n\nThe discussion is at:\nhttps://groups.google.com/d/topic/snappy-compression/3Qa3fASLkNA/discussion\n\nbenchmark old MB/s n\n[…]\n84 1.00x\nBenchmark_ZFlat9-8 169.02 168.59 1.00x\nBenchmark_ZFlat10-8 500.19 499.85 1.00x\nBenchmark_ZFlat11-8 271.20 270.60 1.00x",
"is_bot": false,
"headline": "Make heuristic match skipping more aggressive.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-04-10T06:02:28Z",
"body_truncated": true,
"is_coding_agent": false
},
{
"oid": "cef980a12b316c5b7e5bb3a8e168eb43ae999a88",
"body": null,
"is_bot": false,
"headline": "Add more commentary to minNonLiteralBlockSize.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-04-07T05:15:05Z",
"body_truncated": false,
"is_coding_agent": false
},
{
"oid": "6218a584d0b00caa84f10acfb2eeb5e043b80706",
"body": null,
"is_bot": false,
"headline": "Clarify the semantics of minNonLiteralBlockSize.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-04-07T05:09:02Z",
"body_truncated": false,
"is_coding_agent": false
},
{
"oid": "a2aa89c177511a0881193da2623539494a961109",
"body": null,
"is_bot": false,
"headline": "Add a TestSameEncodingAsCppShortCopies test.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-04-07T04:50:07Z",
"body_truncated": false,
"is_coding_agent": false
},
{
"oid": "857ad66e003f466b64f9055849bab122efd4c87a",
"body": "Fixes #27.",
"is_bot": false,
"headline": "Add gc build tag for the asm code.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-04-04T00:05:40Z",
"body_truncated": false,
"is_coding_agent": false
},
{
"oid": "3675542200b9752da8f113251b47f0d5b372f414",
"body": null,
"is_bot": false,
"headline": "Don't allow EOF in the middle of a framing chunk.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-04-03T13:08:03Z",
"body_truncated": false,
"is_coding_agent": false
},
{
"oid": "0e8b256be2776b48cc0a2a11e5ae228f57471078",
"body": "It should return an error instead.\n\nFixes #26.",
"is_bot": false,
"headline": "Fix a too-long uncompressed frame chunk causing a panic.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-04-03T12:40:17Z",
"body_truncated": false,
"is_coding_agent": false
},
{
"oid": "aca045a2df1eccb72d28abc3066fd19a8fe57a14",
"body": null,
"is_bot": false,
"headline": "Clarify when goEncoderShouldMatchCppEncoder.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-04-03T10:56:43Z",
"body_truncated": false,
"is_coding_agent": false
},
{
"oid": "8939696c2214cde5dda896a76f5bf56e80a16855",
"body": "When encoding the benchmark files, the output size is smaller:\n\nlen(in)\told_len(out)\tnew_len(out)\tnew/old_ratio\tdescription\n102400\t23488\t22842\t0.97\thtml\n702087\t346345\t335387\t0.97\turls\n123093\t123034\t123034\t1.00\tjpg\n200\t144\t146\t1.01\tjpg_200\n102400\t83786\t83817\t1.00\tpdf\n409600\t95095\t92221\t0.97\thtml4\n152\n[…]\n08 1.14x\nBenchmark_ZFlat9-8 149.43 168.62 1.13x\nBenchmark_ZFlat10-8 412.63 497.87 1.21x\nBenchmark_ZFlat11-8 247.98 269.43 1.09x",
"is_bot": false,
"headline": "Use the same encoding algorithm as C++ snappy.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-04-03T01:18:01Z",
"body_truncated": true,
"is_coding_agent": false
},
{
"oid": "ebebc717213d6f16fd33dd6a2f74e776af6493c3",
"body": "This isn't an optimization per se, although it does trade off the\n\"encode 10 bytes\" benchmark to favor speed over output size. The point\nof this commit is to move closer to what the C++ snappy code does.\n\nbenchmark old MB/s new MB/s speedup\nBenchmarkWordsEncode1e1-8 5\n[…]\n62 1.01x\nBenchmark_ZFlat9-8 147.71 149.43 1.01x\nBenchmark_ZFlat10-8 414.06 412.63 1.00x\nBenchmark_ZFlat11-8 248.87 247.98 1.00x",
"is_bot": false,
"headline": "Raise the \"always encode as literal\" size threshold from 4 to 14.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-04-02T23:25:18Z",
"body_truncated": true,
"is_coding_agent": false
},
{
"oid": "7ede8d1b136c90ae4e1bee23e8a36693adca8751",
"body": "As per\nhttps://groups.google.com/d/msg/golang-dev/jVP6h21OyL8/Syhfot9XBQAJ,\nrecent versions of the gc compiler can optimize:\n\nfunc load32(b []byte, i int32) uint32 {\n b = b[i : i+4 : len(b)]\n return uint32(b[0]) | etc | uint32(b[3])<<24\n}\n\nbenchmark old MB/s new MB/s sp\n[…]\n91 1.03x\nBenchmark_ZFlat9-8 142.33 147.71 1.04x\nBenchmark_ZFlat10-8 401.93 414.06 1.03x\nBenchmark_ZFlat11-8 235.94 248.87 1.05x",
"is_bot": false,
"headline": "Eliminate some bounds checks in the encoder.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-04-02T22:30:29Z",
"body_truncated": true,
"is_coding_agent": false
},
{
"oid": "d1f56d22221367c22b310feca1ba49a062f3d646",
"body": "The benchmarks don't show a big change either way, but the output is\nshorter, and it matches what the C++ snappy code does.\n\nbenchmark old MB/s new MB/s speedup\nBenchmarkWordsEncode1e1-8 5.77 5.77 1.00x\nBenchmarkWordsEncode1e2-8 47.15 47.26 \n[…]\n21 1.00x\nBenchmark_ZFlat9-8 141.81 142.32 1.00x\nBenchmark_ZFlat10-8 399.79 401.94 1.01x\nBenchmark_ZFlat11-8 237.43 235.91 0.99x",
"is_bot": false,
"headline": "Encode copies of length 65, 66 or 67 as 5 bytes, not 6.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-04-02T05:22:40Z",
"body_truncated": true,
"is_coding_agent": false
},
{
"oid": "5f1c01d9f64b941dd9582c638279d046eda6ca31",
"body": "benchmark old MB/s new MB/s speedup\nBenchmarkWordsDecode1e1-8 528.93 528.93 1.00x\nBenchmarkWordsDecode1e2-8 983.60 999.00 1.02x\nBenchmarkWordsDecode1e3-8 1474.03 1513.22 1.03x\nBenchmarkWordsDecode1e4-8 1523.38 1561.36\n[…]\n84 1.00x\nBenchmark_UFlat9-8 731.84 726.50 0.99x\nBenchmark_UFlat10-8 2775.21 2898.57 1.04x\nBenchmark_UFlat11-8 1032.75 1032.47 1.00x",
"is_bot": false,
"headline": "Optimize a 16-byte load and store.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-03-04T05:48:22Z",
"body_truncated": true,
"is_coding_agent": false
},
{
"oid": "427fb6fc07997f43afa32f35e850833760e489a7",
"body": "Relative to the previous commit:\n\nbenchmark old MB/s new MB/s speedup\nBenchmarkWordsDecode1e1-8 518.80 508.74 0.98x\nBenchmarkWordsDecode1e2-8 871.43 962.52 1.10x\nBenchmarkWordsDecode1e3-8 1411.32 1435.51 1.02x\nBenchmarkWordsDe\n[…]\ntra compression. Decompression\ncollapses to not much more than repeatedly invoking runtime.memmove, so\noptimizing the snappy code per se doesn't have a huge impact on that\nparticular benchmark number.",
"is_bot": false,
"headline": "Optimize asm for decoding copy fragments some more.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-02-26T06:30:25Z",
"body_truncated": true,
"is_coding_agent": false
},
{
"oid": "4c1fc8e426266f00229956994142877543e8b514",
"body": "Relative to the previous commit:\n\nbenchmark old MB/s new MB/s speedup\nBenchmarkWordsDecode1e1-8 518.05 518.80 1.00x\nBenchmarkWordsDecode1e2-8 776.28 871.43 1.12x\nBenchmarkWordsDecode1e3-8 995.41 1411.32 1.42x\nBenchmarkWordsDe\n[…]\n38 1.79x\nBenchmark_UFlat9-8 423.36 724.43 1.71x\nBenchmark_UFlat10-8 1023.05 1193.70 1.17x\nBenchmark_UFlat11-8 507.18 879.15 1.73x",
"is_bot": false,
"headline": "Optimize asm for decoding copy fragments.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-02-26T06:21:48Z",
"body_truncated": true,
"is_coding_agent": false
},
{
"oid": "8c7c9dec5965484f0a81268ce7985fe31e5d5955",
"body": "Relative to the previous commit:\n\nbenchmark old MB/s new MB/s speedup\nBenchmarkWordsDecode1e1-8 519.36 518.05 1.00x\nBenchmarkWordsDecode1e2-8 691.63 776.28 1.12x\nBenchmarkWordsDecode1e3-8 858.97 995.41 1.16x\nBenchmarkWordsDe\n[…]\n19 1.14x\nBenchmark_UFlat9-8 362.89 423.36 1.17x\nBenchmark_UFlat10-8 943.89 1023.05 1.08x\nBenchmark_UFlat11-8 493.98 507.18 1.03x",
"is_bot": false,
"headline": "Optimize asm for decoding literal fragments.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-02-26T06:17:00Z",
"body_truncated": true,
"is_coding_agent": false
},
{
"oid": "402436317ad8035a7246ee89492064f9e6cbb4ce",
"body": "This is an experiment. A future commit may roll back this commit if it\nturns out that the complexity and inherent unsafety of asm code\noutweights the performance benefits.\n\nThe new asm code is covered by existing tests: TestDecode,\nTestDecodeLengthOffset and TestDecodeGoldenInput. These tests were\nc\n[…]\n benefits of hand-written asm gets you another\n1.2x over and above that.\n\nFor reference, I've copy/pasted the \"go tool compile -S -B -o /dev/null\nmain.go\" output at http://play.golang.org/p/vOs4Z7Qf1X",
"is_bot": false,
"headline": "Rewrite the core of the decoder in asm.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-02-26T06:03:02Z",
"body_truncated": true,
"is_coding_agent": false
},
{
"oid": "03ee571cd35416c1f81a9f9ad7437493f356666d",
"body": "Previously, the dst buffer was initialized to all 0xfe byte values. An\noverrun caused by an incorrect copy from an early location to a later\none (past the end of dst) could have slipped through as a false negative\nbecause the old value and the new value were the same value (0xfe), so\nno change was detected.\n\nAfter this commit, the dst buffer is initialized with a variety of byte\nvalues, which makes it less likely, although not impossible, to have\nsuch false negatives.",
"is_bot": false,
"headline": "Use more than one 'not present' byte value to catch Decode overruns.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-02-26T04:08:01Z",
"body_truncated": false,
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},
{
"oid": "9eb9b0a693667cb6f6f82bfaad32bc9604818ccb",
"body": null,
"is_bot": false,
"headline": "Add a comment about forwardCopy semantics.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-02-26T03:40:06Z",
"body_truncated": false,
"is_coding_agent": false
},
{
"oid": "da163d3224e54fb4a5616b463f429a267c490ab0",
"body": null,
"is_bot": false,
"headline": "Note that Decode's dst and src must not overlap.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-02-25T23:31:01Z",
"body_truncated": false,
"is_coding_agent": false
},
{
"oid": "12528fe03377c314f32e3dc5e029835d42ccad90",
"body": "An upcoming commit will switch algorithms at values near this magic cutoff.",
"is_bot": false,
"headline": "Make TestDecodeLengthOffset test values above 16.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-02-25T12:55:04Z",
"body_truncated": false,
"is_coding_agent": false
},
{
"oid": "32b392a8a69efa93c6b91f2879ce2e8d7cc48e6a",
"body": "I'm not entirely sure why the benchmark numbers improve as much as they\ndo, but I'll take it.\n\nbenchmark old MB/s new MB/s speedup\nBenchmarkWordsDecode1e1-8 482.12 485.84 1.01x\nBenchmarkWordsDecode1e2-8 372.28 421.86 1.13x\nBenchmarkWordsDec\n[…]\n80 1.02x\nBenchmark_UFlat9-8 256.39 262.69 1.02x\nBenchmark_UFlat10-8 590.37 640.96 1.09x\nBenchmark_UFlat11-8 339.13 357.01 1.05x",
"is_bot": false,
"headline": "Make a small s/uint/uint32/ decoder optimization.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-02-25T05:58:01Z",
"body_truncated": true,
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},
{
"oid": "624b11c0e081dc0941e36b0f1c84436dc78b9384",
"body": null,
"is_bot": false,
"headline": "Fix some comment styles.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-02-25T04:30:12Z",
"body_truncated": false,
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},
{
"oid": "bb00731b7e6e99396fd9fceb71cb9a4ec8d5a84e",
"body": null,
"is_bot": false,
"headline": "Ensure that Decode doesn't write past the decoded length.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-02-25T03:10:04Z",
"body_truncated": false,
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},
{
"oid": "343d0f457986aaa28f2f835d2fc658b05f2f0575",
"body": "The pi.txt.rawsnappy file was generated by this tool, on an amd64\n(little-endian) system.",
"is_bot": false,
"headline": "Add a snappytool command that uses the C++ library.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-02-25T02:31:42Z",
"body_truncated": false,
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{
"oid": "f1ae40350d6b5e75c92360916bf2b8682fefdb9d",
"body": null,
"is_bot": false,
"headline": "Update .gitignore.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-02-25T00:51:15Z",
"body_truncated": false,
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},
{
"oid": "6d15e7ca47959c9369adfcdc4dee85987e724222",
"body": "An upcoming commit will add other testdata files.",
"is_bot": false,
"headline": "Move benchmark data files to testdata/bench.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-02-25T00:27:56Z",
"body_truncated": false,
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},
{
"oid": "a64ab7d6ec9063f18962f0e493a31e7093df6102",
"body": null,
"is_bot": false,
"headline": "Add TestDecodeLengthOffset.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-02-23T12:49:10Z",
"body_truncated": false,
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{
"oid": "b95e9b379b96cebd6fe84815474678b48f01aae5",
"body": null,
"is_bot": false,
"headline": "Merge overlapping test cases in TestInvalidVarint and TestDecode.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-02-23T11:58:05Z",
"body_truncated": false,
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{
"oid": "939eddc12b3be18dfc77ed573344c3c689527ef3",
"body": null,
"is_bot": false,
"headline": "Add some more TestDecode cases.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-02-23T02:12:51Z",
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{
"oid": "e2923611954f008a6e6c8dfb5ae11052aa913332",
"body": null,
"is_bot": false,
"headline": "Catch overflow when incrementing src pointers.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-02-22T02:44:50Z",
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{
"oid": "bf2ded9d81f5c22b62cf76363673c6f9765a6703",
"body": "This enables future optimizations, such as an encoder's hash table entry being\nuint16 instead of int32.",
"is_bot": false,
"headline": "Use 64K blocks when encoding long inputs.",
"author_name": "Nigel Tao",
"author_login": "nigeltao",
"committed_at": "2016-02-22T01:44:36Z",
"body_truncated": false,
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{
"oid": "d1d908a252c22fd7afd36190d5cffb144aa8f777",
"body": "The heuristic was introduced in 4e2aa98e, based on the C++ Snappy\nimplementation, but the Go code contained a flawed optimization. The C++ code\nused an explicit skip variable:\n\n uint32 bytes_between_hash_lookups = skip++ >> 5;\n next_ip = ip + bytes_between_hash_lookups;\n\nwhereas the Go code optimi\n[…]\nenerated on an amd64 machine, but on a different machine\nthan the one used for other recent commits. The raw MB/s numbers are therefore\nnot directly comparable, although the speedup numbers should be.",
"is_bot": false,
"headline": "Fix heuristic match skipping.",
"author_name": "Nigel Tao",
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{
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{
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"notes": [],
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{
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{
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{
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{
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{
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"code": "no_data",
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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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{
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{
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{
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{
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{
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{
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"points": 55,
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],
"description": "How well is the repo equipped to be developed and maintained with AI coding agents? An independent, experimental badge — weight 0.0, so it is surfaced on its own and does not affect the overall health score."
}
],
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},
"warnings": [
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],
"report_type": "repository",
"generated_at": "2026-07-28T13:24:33.528389Z",
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}
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Scores are signals, not warranties. They reflect publicly visible practices on GitHub — not a code audit, and not a security guarantee.
Missing data is excluded and weights renormalized, never scored as zero. Methodology is versioned and open: metrics v1.13.0, schema v0.27.0 — full methodology · metrics wiki.
