Public recordModerate
Software health reportschema 0.27.0 · metrics 1.13.0 · 2026-07-22 23:54 UTC
fitzgen / bumpalo
A fast bump allocation arena for Rust
fitzgen/bumpalo holds a health index of 67 out of 100, placing it in the Moderate band. It scores highest on Community & Adoption (74/100) and lowest on AI Readiness (52/100). It was last updated 15 days ago. A single contributor accounts for most of its recent work.
67
overall / 100Software 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.
67
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.
Ownership
Nick FitzgeraldPersonal account
1,943 followers334 public repossince Apr 2009
This repository is owned by a personal account. A single-owner project carries more continuity risk than an organization-backed one.
Package ecosystems
| Registry | Package | Version | Downloads / mo | Versions | Last publish | Tags |
|---|---|---|---|---|---|---|
| crates.io | bumpalo | 3.20.3 | 40,339,352 | 56 | 61 days ago | allocatorarenabumpmemory-managementno-stdrust-patterns |
Metrics by category
Vitality
Is the project alive — is code being written and are releases shipping?
67
Development activity
59Moderate
How it's scored
| 28.8/36 | Push recency — last push 15 days ago |
| 10.4/36 | Commit cadence — 15/52 weeks with commits |
| 12.7/18 | Commit volume — 25 commits in the last year |
| 7/10 | OpenSSF Scorecard: Maintained — 8 commit(s) and 1 issue activity found in the last 90 days -- score normalized to 7 |
Inputs used
| commits_last_year | 25 |
| human_commit_share | 1 |
| days_since_last_push | 15 |
| active_weeks_last_year | 15 |
Release discipline
80Good
How it's scored
| 16.2/27 | Ships releases — 55 version tags (no GitHub releases) |
| 36/36 | Release recency — latest release 61 days ago |
| 19.8/27 | Release cadence — a release every ~86 days |
| 0/10 | OpenSSF Scorecard: Signed-Releases — no data |
Inputs used
| releases_count | 55 |
| latest_release_tag | v3.20.3 |
| releases_from_tags | yes |
| days_since_latest_release | 61 |
| mean_days_between_releases | 86 |
Excluded from scoring (no data or not applicable): OpenSSF Scorecard: Signed-Releases. Remaining weights renormalized.
Community & Adoption
Does the project have users, downloads, attention, and a welcoming setup for contributors?
74
Popularity & adoption
79Good
How it's scored
| 54.5/60 | Stars — 2,282 stars |
| 18.2/25 | Forks — 153 forks |
| 6.4/15 | Watchers — 15 watchers |
Inputs used
| forks | 153 |
| stars | 2,282 |
| watchers | 15 |
| growth_state | unverified |
| growth_factor_pct | 100 |
| growth_unverified_reason | no_history |
Community health
50Moderate
How it's scored
| 22.5/22.5 | README |
| 22.5/22.5 | License — recognized license (Apache-2.0) |
| 0/18 | CONTRIBUTING guide |
| 0/13.5 | Code of conduct |
| 0/7.2 | Issue template |
| 0/6.3 | PR template |
Inputs used
| has_readme | yes |
| has_license | yes |
| has_contributing | no |
| has_issue_template | no |
| has_code_of_conduct | no |
| has_pull_request_template | no |
Ecosystem adoption (downloads)
100Excellent
How it's scored
| 80/80 | Monthly downloads — 40,339,352 downloads/month across crates |
| 0/20 | Registry dependents — not reported by this ecosystem |
Inputs used
| packages | bumpalo |
| dependents | — |
| ecosystems | crates |
| total_downloads | 482,450,505 |
| monthly_downloads | 40,339,352 |
Excluded from scoring (no data or not applicable): Registry dependents. Remaining weights renormalized.
Sustainability & Governance
Will the project survive its people — bus factor, responsiveness, who backs it, and package upkeep?
70
Maintainer resilience (bus factor)
42At risk
How it's scored
| 9/54 | Bus factor — 1 contributor(s) cover half of all commits |
| 9.7/22.5 | Commit distribution — top contributor authored 57% of commits |
| 13.5/13.5 | Contributor breadth — 66 contributors |
| 10/10 | OpenSSF Scorecard: Contributors — project has 24 contributing companies or organizations |
Inputs used
| bus_factor | 1 |
| contributors_sampled | 66 |
| top_contributor_share | 0.57 |
How it's scored
| 35.1/46.8 | Issue resolution — 75% of issues closed |
| 32.9/38.3 | PR acceptance — 160/186 decided PRs merged |
| 7.5/15 | OpenSSF Scorecard: Code-Review — Found 16/30 approved changesets -- score normalized to 5 |
Inputs used
| merged_prs | 160 |
| open_issues | 34 |
| closed_issues | 102 |
| issue_closed_ratio | 0.75 |
| closed_unmerged_prs | 26 |
Ownership & stewardship
73Good
How it's scored
| 10/30 | Ownership backing — personal (user) account |
| 0/20 | Verified domain — not applicable to user accounts |
| 23.6/25 | Owner reach — 1,943 followers of fitzgen |
| 25/25 | Track record — 334 public repos, account ~17 yr old |
Inputs used
| followers | 1,943 |
| owner_type | User |
| is_verified | — |
| owner_login | fitzgen |
| public_repos | 334 |
| account_age_days | 6,306 |
Excluded from scoring (no data or not applicable): Verified domain. Remaining weights renormalized.
Package maintenance
100Excellent
How it's scored
| 25/25 | Published & resolvable — 1 package(s) on crates |
| 35/35 | Publish recency — latest publish 61 days ago |
| 20/20 | Version history — 56 published versions |
| 20/20 | Not deprecated — active, not deprecated or yanked |
Inputs used
| packages | bumpalo |
| ecosystems | crates |
| any_deprecated | no |
| min_days_since_publish | 61 |
Engineering Quality
Are baseline engineering and documentation practices in place?
62
Engineering practices
66Moderate
How it's scored
| 24/24 | CI workflows — 1 workflow(s) |
| 24/24 | Tests present |
| 0/16 | Linter config |
| 0/9.6 | Pre-commit hooks |
| 0/6.4 | .editorconfig |
| 18/20 | OpenSSF Scorecard: CI-Tests — 27 out of 29 merged PRs checked by a CI test -- score normalized to 9 |
Inputs used
| has_ci | yes |
| has_tests | yes |
| has_editorconfig | no |
| has_linter_config | no |
| has_precommit_config | no |
Documentation
55Moderate
How it's scored
| 30/30 | README |
| 0/25 | Documentation directory |
| 15/15 | Documentation / homepage site — https://docs.rs/bumpalo |
| 10/10 | Repository description |
| 0/10 | Topics |
| 0/10 | Wiki |
Inputs used
| topics | — |
| has_wiki | no |
| homepage | https://docs.rs/bumpalo |
| has_readme | yes |
| has_docs_dir | no |
| has_description | yes |
Security
Are visible security and supply-chain practices strong, without unresolved high-risk jurisdiction exposure?
58
Security posture
50Moderate
How it's scored
| 7.5/7.5 | Binary-Artifacts — no binaries found in the repo |
| 0/7.5 | Branch-Protection — branch protection not enabled on development/release branches |
| 2.2/2.5 | CI-Tests — 27 out of 29 merged PRs checked by a CI test -- score normalized to 9 |
| 0/2.5 | CII-Best-Practices — no effort to earn an OpenSSF best practices badge detected |
| 3.8/7.5 | Code-Review — Found 16/30 approved changesets -- score normalized to 5 |
| 2.5/2.5 | Contributors — project has 24 contributing companies or organizations |
| 10/10 | Dangerous-Workflow — no dangerous workflow patterns detected |
| 0/7.5 | Dependency-Update-Tool — no update tool detected |
| 0/5 | Fuzzing — project is not fuzzed |
| 2.5/2.5 | License — license file detected |
| 5.2/7.5 | Maintained — 8 commit(s) and 1 issue activity found in the last 90 days -- score normalized to 7 |
| 0/5 | Packaging — no data |
| 0/5 | Pinned-Dependencies — dependency not pinned by hash detected -- score normalized to 0 |
| 0/5 | SAST — SAST tool is not run on all commits -- score normalized to 0 |
| 5/5 | Security-Policy — security policy file detected |
| 0/7.5 | Signed-Releases — no data |
| 0/7.5 | Token-Permissions — detected GitHub workflow tokens with excessive permissions |
| 7.5/7.5 | Vulnerabilities — 0 existing vulnerabilities detected |
Inputs used
| source | openssf_scorecard |
| checks_evaluated | 16 |
| scorecard_version | v5.5.0 |
| checks_inconclusive | 2 |
| scorecard_aggregate | 5 |
Excluded from scoring (no data or not applicable): packaging, signed_releases. Remaining weights renormalized.
Dependency advisories
90Excellent
How it's scored
| 35/35 | Direct dependencies free of known advisories — no direct dependency carries a known advisory |
| 18.5/25 | Indirect dependencies free of known advisories — 2 affected: atty 0.2.14 (low), serde_cbor 0.11.2 (unknown) |
| 36.4/40 | No advisories left outstanding — 2 advisory-carrying package(s) unaddressed past 90 days; oldest published 1,844 days ago |
Inputs used
| source | osv |
| advisories | 4 |
| affected_packages | 2 |
| assessed_packages | 73 |
| unassessed_packages | 0 |
| affected_by_severity | low 1, unknown 1 |
| direct_affected_packages | 0 |
Matched the crates:bumpalo@3.20.3 runtime dependency closure — what installing the published package pulls in — 73 packages. Reachability is not analyzed.
AI Readiness
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.
52
Agent context & guidance
39At risk
How it's scored
| 0/45 | Agent instructions — no CLAUDE.md / AGENTS.md / editor rules |
| 0/15 | Machine-readable docs (llms.txt) |
| 38.9/40 | Legible commit history — 73 of 100 human commits state their intent (structured subject or explanatory body) |
Inputs used
| has_llms_txt | no |
| legible_history_share | 0.73 |
| agent_instruction_files | — |
| agent_instruction_max_bytes | — |
How it's scored
| 12.6/18 | One-command bootstrap — Cargo.toml (toolchain convention, no task runner) |
| 22/22 | Automated tests |
| 0/11 | Lint / format config |
| 11/11 | Static type checking — Rust (statically typed) |
| 0/10 | Reproducible environment |
| 0/10 | Demonstrated agent practice — no agent-authored commits among the last 100 |
| 0/8 | Automated maintenance — no automated dependency updates observed |
| 0/10 | OpenSSF Scorecard: Pinned-Dependencies — dependency not pinned by hash detected -- score normalized to 0 |
Inputs used
| has_nix | no |
| has_tests | yes |
| lockfiles | — |
| has_dockerfile | no |
| typed_language | yes |
| bootstrap_files | — |
| has_devcontainer | no |
| has_linter_config | no |
| typecheck_configs | — |
| agent_commit_share | 0 |
| toolchain_manifests | Cargo.toml |
| dependency_bot_commit_share | 0 |
Code legibility for models
95Excellent
How it's scored
| 45/45 | Type-checkable code — Rust (statically typed) |
| 50.4/55 | Manageable file sizes — 3/36 source files over 60KB |
Inputs used
| primary_language | Rust |
| largest_source_bytes | 100,670 |
| source_files_sampled | 36 |
| oversized_source_files | 3 |
Key facts
2,282GitHub stars
66contributors
25commits, last 12 months
15days since last push
55releases
1bus factor
34open issues
crates.iopackage ecosystems
Data collection warnings
- Star history unavailable: GitHub GraphQL error: Resource not accessible by personal access token
More detail
Star and fork history 0 ★ / 153 ⇿
0Stars
153Forks
52Releases
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 28Patch 23
Each point covers 7 days.
OpenSSF Scorecard 5.0 / 10
5.0aggregate
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).
| 10 | Binary-Artifacts | no binaries found in the repo |
| 0 | Branch-Protection | branch protection not enabled on development/release branches |
| 9 | CI-Tests | 27 out of 29 merged PRs checked by a CI test -- score normalized to 9 |
| 0 | CII-Best-Practices | no effort to earn an OpenSSF best practices badge detected |
| 5 | Code-Review | Found 16/30 approved changesets -- score normalized to 5 |
| 10 | Contributors | project has 24 contributing companies or organizations |
| 10 | Dangerous-Workflow | no dangerous workflow patterns detected |
| 0 | Dependency-Update-Tool | no update tool detected |
| 0 | Fuzzing | project is not fuzzed |
| 10 | License | license file detected |
| 7 | Maintained | 8 commit(s) and 1 issue activity found in the last 90 days -- score normalized to 7 |
| n/a | Packaging | packaging workflow not detected |
| 0 | Pinned-Dependencies | dependency not pinned by hash detected -- score normalized to 0 |
| 0 | SAST | SAST tool is not run on all commits -- score normalized to 0 |
| 10 | Security-Policy | security policy file detected |
| n/a | Signed-Releases | no releases found |
| 0 | Token-Permissions | detected GitHub workflow tokens with excessive permissions |
| 10 | Vulnerabilities | 0 existing vulnerabilities detected |
Direct dependencies 2
| Registry | Package | Version constraint | Manifest |
|---|---|---|---|
| crates.io | allocator-api2 | 0.2.8 | Cargo.toml |
| crates.io | serde | 1.0.171 | Cargo.toml |
All dependencies 9
Full resolved dependency set from the GitHub dependency graph: 2 direct and 7 indirect (transitive) packages. The transitive closure is complete when the repository commits a lockfile.
| Registry | Package | Version | Relation |
|---|---|---|---|
| crates.io | allocator-api2 | — | direct |
| crates.io | serde | — | direct |
| crates.io | blink-alloc | 0.4.0 | indirect |
| crates.io | criterion | — | indirect |
| crates.io | mutatis | — | indirect |
| crates.io | rand | — | indirect |
| crates.io | rayon | 1.10.0 | indirect |
| crates.io | rayon-core | 1.12.1 | indirect |
| crates.io | serde_json | — | indirect |
Dependency advisories 2
Installing crates:bumpalo@3.20.3 pulls in 73 packages, direct and transitive: 2 carry known advisories, of which 0 are direct dependencies.
| Package | Version | Relation | Severity | Advisories | Fixed in |
|---|---|---|---|---|---|
| atty | 0.2.14 | indirect | low | 3 | — |
| serde_cbor | 0.11.2 | indirect | unknown | 1 | — |
An advisory means the version recorded in the dependency graph falls inside an advisory’s affected range. Reachability is not analysed, and the graph includes development and test pins — a finding may concern tooling rather than shipped software.
Raw JSON report machine-readable
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},
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},
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}
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"headline": "Vec::retain_mut (#282)",
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"body": "* Revert \"Update `allocator-api2` to v0.3 (#271)\"\n\nThis reverts commit 86aaa107b8bd1597e05744a2701bcac80c15b0cc.\n\nThis was a breaking change.\n\n* Bump to version 3.18.1",
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"body": "When a new chunk is created, allocated_bytes does not include the footer\nsize. In reset, however, the footer size was implicitly included. This\nsubtracts the footer size from the chunks new allocated_bytes",
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"headline": "fix: subtract footer size from allocated_bytes on reset (#275)",
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"body": "…#272)\n\nReplaced the existing extend_from_slice with the implementation used in\nmy formally verified bump allocator. Replaced verus proofs with comments.\n\nAdditionally, lifted the write + length increment in push to push_unchecked,\nwithout exposing this publicly.\n\nIn the benchmark 'extend 16384 byte\n[…]\nrease with respect to the input size, as well as the correspondence with\n'extend_from_slice_copy' benchmarks.\n\nNo changes in public API, all tests pass (release, debug, miri), and MSRV\nremains 1.71.1.",
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"body": "* Add a CI job to check that code is formatted\n\n* Run `cargo fmt`\n\n* Install latest rustfmt with rustup\n\n* Add image the CI job runs on\n\n* Actually check out the code",
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"headline": "Add a CI job to check that code is formatted (#273)",
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"body": "* Import a subset of blink-alloc benchmarks\n\n* Add support for enforcing minimum alignment in `Bump`\n\nEnforcing a minimum alignment can speed up allocation of objects with alignment\nless than or equal to the minimum alignment. This comes at the cost of\nintroducing otherwise-unnecessary padding between allocations of objects with\nalignment less than the minimum.\n\n* Fix non-nightly CI builds\n\n* Fix tests for Rust 1.73",
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"headline": "Add support for enforcing minimum alignment in `Bump` (#268)",
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"body": "Additionally reorganize tests to split the ones\nthat depend on `collections` and `boxed` features.",
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"headline": "add serde serialization for String (#266)",
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"headline": "use primitive type u64 in README (#264)",
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"body": "This change adds slice allocation functions that can fail, to match the\nscalar allocation functions that can fail.",
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"headline": "Add fallible slice allocation functions (#262)",
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"headline": "Bump to version 3.17.0 (#263)",
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"body": "* add `try_` functions for slices and `str`\n\n* Apply suggestions from code review\n\nCo-authored-by: Nick Fitzgerald <fitzgen@gmail.com>\n\n* avoid referencing unitialized memory\n\n---------\n\nCo-authored-by: Nick Fitzgerald <fitzgen@gmail.com>",
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"headline": "add `try_` functions for slices and `str` (#260)",
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"headline": "docs: fix typo (#257)",
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"body": "* Fixed stacked borrows violation in `dealloc` (fixes #247)\r\n\r\n* Added regression test",
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"headline": "Fixed stacked borrows violation in `dealloc` (fixes #247) (#248)",
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"headline": "Reduce rust-version to 1.71.1 (#252)",
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"headline": "Remove bogus executable filesystem permissions from Rust sources (#249)",
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"headline": "Fix warning when testing without the `allocator_api` cargo feature (#…",
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"headline": "Bump to version 3.16.0",
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"headline": "add serde serialization support (#210)",
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"headline": "Bump to version 3.15.4",
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"body": "These methods were not annotated with `#[inline]`, meaning they will not be\ninlined into client crates unless they enable LTO",
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"headline": "Annotate `Allocator` methods with `#[inline]`",
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"body": "ci: Update `actions/checkout` from v3 to v4.",
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"headline": "Merge pull request #224 from waywardmonkeys/update-checkout-action",
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"body": "Bump MSRV to 1.65.",
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"headline": "Merge pull request #225 from waywardmonkeys/bump-msrv",
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"headline": "Update CHANGELOG.md",
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"body": "Currently, the regex crate requires this, but it will also allow\nto bump the criterion crate.",
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"headline": "Bump MSRV to 1.65.",
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"body": "clippy: Use semicolon when not returning a value.",
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"headline": "Merge pull request #219 from waywardmonkeys/use-semicolon",
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"body": "cargo fmt",
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"headline": "Merge pull request #220 from waywardmonkeys/fix-fmt",
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"body": "fixed `_` instead of `-` in name `allocator-api2`",
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"headline": "Merge pull request #217 from mgerhold/patch-1",
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"headline": "Remove clippy annotations",
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"headline": "fixed `_` instead of `-` in name `allocator-api2`",
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"headline": "Bump to version 3.14.0",
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"body": "Implement `std::io::Write` for `Vec<'bump, u8>`",
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"headline": "Merge pull request #216 from marmeladema/std-io-write",
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"body": "Fix some typos.",
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"headline": "Merge pull request #214 from waywardmonkeys/typo-fixes",
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"headline": "Fix some typos.",
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"body": "clippy: Remove unneccessary casts.",
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"headline": "Merge pull request #212 from waywardmonkeys/clippy-unnecessary-cast",
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"headline": "clippy: Remove unneccessary casts.",
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"body": "Update license field following SPDX 2.1 license expression standard",
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"headline": "Merge pull request #211 from frisoft/main",
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"body": "Update license field following SPDX 2.1 license expression standard",
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"headline": "Merge pull request #1 from frisoft/update-license-field",
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"body": "The new recommendation is to follow the SPDX 2.1 standard.\r\nThis allows automatic license verification software to work properly.\r\n\r\nReference: https://doc.rust-lang.org/cargo/reference/manifest.html#the-license-and-license-file-fields",
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"headline": "Merge pull request #209 from msullivan/chunk_capacity",
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"body": "`chunk_capacity` is documented as returning \"the remaining capacity in\nthe current chunk\", but actually returns the *total* capacity for the\ncurrent chunk.\n\n(Arguably, the actual behavior is itself totally sensible, and this is\na documentation bug, though in that case I would propose adding a new\nfunction that returns the remaining capacity. I would like it for\ndebugging/measurement purposes.)",
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"headline": "Merge pull request #201 from zakarumych/main",
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"body": "\"nightly\" enables use of unstable allocator_api.\n\"allocator_api\" without \"nightly\" enables usage of allocator-api2",
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"headline": "Gently bump MSRV to 1.63",
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"headline": "Bump to version 3.12.2",
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"status": "met",
"details": [
{
"code": "ci_workflows",
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"count": 1
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}
],
"max_points": 24
},
{
"key": "tests_present",
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"detail": null,
"points": 24,
"status": "met",
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"max_points": 24
},
{
"key": "linter_config",
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"points": 0,
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{
"key": "pre_commit_hooks",
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"points": 0,
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},
{
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"details": [],
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},
{
"key": "openssf_scorecard_ci_tests",
"name": "OpenSSF Scorecard: CI-Tests",
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"points": 18,
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]
},
{
"key": "documentation",
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"note": null,
"notes": [],
"value": 55,
"inputs": {
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"components": [
{
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"points": 30,
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{
"key": "documentation_directory",
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{
"key": "documentation_homepage_site",
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"status": "met",
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{
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"points": 10,
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{
"key": "topics",
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"points": 0,
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{
"key": "wiki",
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"detail": null,
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}
],
"description": "Are baseline engineering and documentation practices in place?"
},
{
"key": "security",
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"name": "Security",
"value": 58,
"weight": 0.16,
"metrics": [
{
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"notes": [
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{
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{
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{
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"points": 0,
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},
{
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"points": 3.8,
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},
{
"key": "contributors",
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},
{
"key": "dangerous_workflow",
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},
{
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},
{
"key": "fuzzing",
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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": 0,
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},
{
"key": "security_policy",
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"points": 5,
"status": "met",
"details": [],
"max_points": 5
},
{
"key": "signed_releases",
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"code": "no_data",
"params": {}
}
],
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},
{
"key": "token_permissions",
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"points": 0,
"status": "missed",
"details": [],
"max_points": 7.5
},
{
"key": "vulnerabilities",
"name": "Vulnerabilities",
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"points": 7.5,
"status": "met",
"details": [],
"max_points": 7.5
}
]
},
{
"key": "dependency_advisories",
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"notes": [
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},
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},
{
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"points": 36.4,
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],
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"note": null,
"notes": [],
"value": 100,
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"notes": [
{
"code": "jurisdiction_evidence_limits",
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}
],
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}
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],
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{
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{
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{
"key": "manageable_file_sizes",
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"points": 50.4,
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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."
}
],
"metrics_version": "1.13.0"
},
"warnings": [
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],
"report_type": "repository",
"generated_at": "2026-07-22T23:54:52.935515Z",
"schema_version": "0.27.0",
"badge_url": "https://raw.githubusercontent.com/inspect-software/badges/main/v1/f/fitzgen/bumpalo.svg",
"full_name": "fitzgen/bumpalo",
"license_state": "standard",
"license_spdx": "Apache-2.0"
}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.
How one result sits in the wider record: aggregate statistics — crates.io.