fix(metabench): isolate native probes and harden benchmark reporting by geeknoid · Pull Request #807 · microsoft/oxidizer

Martin Taillefer (geeknoid) · 2026-10-11T18:42:50Z

Summary

Move allocation, perf, and VTune collection into private native-case callers, preserving benchmark bodies and collector-free ordinary adapters.
Bypass allocation tracking in ordinary workers and isolate each collector by validated worker mode.
Correct Criterion estimate/confidence reporting, native case identities, compiler compatibility, and baseline publication safety.
Harden artifact admission and diagnostic output; add structural, protocol, lifecycle, cross-thread, and failure-path regressions.
Require Linux native listing/smoke contracts in CI and document the supported measurement boundaries.

Validation

Scoped Anvil Clippy and spelling checks, changed-file formatting, and generated README verification passed.
123 runtime unit tests, public API/protocol tests, macro structural and consumer contracts, and targeted native process regressions passed.
Required Linux listing/smoke checks passed; missing native prerequisites fail the required tier.
Miri, mutation testing, full-workspace tests, and performance measurements were not run locally.

Copilot

🟡 Changes recommended

Captured worker logs remain unbounded and can exhaust filesystem storage.

1 open finding

Unbounded worker logs can exhaust disk space · New

What changed in this PR

This PR isolates Metabench collectors in native probe workers and strengthens reporting, artifact handling, diagnostics, and CI coverage.

Changes:

Adds generated native probe discovery/execution with isolated allocation, perf, and VTune collection.
Hardens report metadata, Criterion estimates, artifact admission, baseline publication, and diagnostics.
Adds extensive protocol, lifecycle, failure-path, and Linux native-contract tests.

File	Description
`.github/workflows/repository-checks.yml`	Adds required Linux native-contract checks.
`Cargo.toml`	Updates shared Gungraun-related dependencies.
`Cargo.lock`	Records dependency resolution changes.
`docs/metabench-native-contracts.md`	Documents native CI contracts.
`crates/metabench/Cargo.toml`	Updates Metabench dependencies.
`crates/metabench/README.md`	Regenerates crate documentation.
`crates/metabench/build.rs`	Captures build-time compiler identity.
`crates/metabench/src/__private.rs`	Exposes generated probe support.
`crates/metabench/src/allocation.rs`	Activates tracking only in allocation workers.
`crates/metabench/src/allocator.rs`	Adds collector-aware allocator wrapper.
`crates/metabench/src/arguments.rs`	Adds smoke-mode argument handling.
`crates/metabench/src/artifact.rs`	Hardens artifacts and estimate parsing.
`crates/metabench/src/entrypoint.rs`	Connects generated probes to the runner.
`crates/metabench/src/error.rs`	Adds probe-specific diagnostics.
`crates/metabench/src/identity.rs`	Removes obsolete allocation-selection accessor.
`crates/metabench/src/lib.rs`	Documents measurement and reporting contracts.
`crates/metabench/src/metric_display.rs`	Updates metric labels and ordering.
`crates/metabench/src/perf.rs`	Activates perf only in validated workers.
`crates/metabench/src/probe.rs`	Implements probe discovery and execution.
`crates/metabench/src/report.rs`	Adds schema-9 estimates and safer rendering.
`crates/metabench/src/runner.rs`	Orchestrates probes, logs, smoke runs, and publication.
`crates/metabench/src/vtune.rs`	Activates VTune only in validated workers.
`crates/metabench/examples/instrumentation_controls.rs`	Adds instrumentation comparison fixture.
`crates/metabench/examples/measurement_boundaries.rs`	Adds workload-boundary fixture.
`crates/metabench/examples/native_probe_contracts.rs`	Adds lifecycle and iterator fixture.
`crates/metabench/examples/threaded_allocations.rs`	Adds cross-thread allocation fixture.
`crates/metabench/tests/probe_protocol.rs`	Tests authenticated probe rejection paths.
`crates/metabench/tests/spawned_benchmark.rs`	Expands process-level regressions.
`crates/metabench/tests/fixtures/artifacts/criterion/duplicate/a/new/estimates.json`	Updates Criterion estimate fixture.
`crates/metabench/tests/fixtures/artifacts/criterion/duplicate/b/new/estimates.json`	Updates Criterion estimate fixture.
`crates/metabench/tests/fixtures/artifacts/criterion/invalid_numeric/new/estimates.json`	Updates invalid estimate fixture.
`crates/metabench/tests/fixtures/artifacts/criterion/minimal/new/estimates.json`	Updates minimal estimate fixture.
`crates/metabench/tests/fixtures/artifacts/criterion/missing_function/new/estimates.json`	Updates missing-function fixture.
`crates/metabench/tests/fixtures/artifacts/criterion/unicode/new/estimates.json`	Updates Unicode fixture.
`crates/metabench/tests/fixtures/artifacts/traversal/cycle/new/estimates.json`	Updates traversal fixture.
`crates/metabench_macros/src/lib.rs`	Documents collector-free macro expansion.
`crates/metabench_macros/tests/compile.rs`	Reworks compile-test fixture reuse.
`crates/metabench_macros/tests/ui/pass/generated_name_collisions.rs`	Expands generated-name collision coverage.
`crates/metabench_macros_impl/src/benchmark.rs`	Generates isolated probe adapters.
`crates/metabench_macros_impl/src/shared.rs`	Adds readable collision-safe native names.
`crates/metabench_macros_impl/src/target.rs`	Generates probe tables and lifecycle links.

🧠 Review effort: Balanced

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Martin Taillefer (geeknoid) · 2026-10-11T18:47:53Z

Fixed the Windows CI baseline failures: artifact-admission tests now respect the reader’s intentional write-sharing denial, and the oversized fixture closes its writer before admission. The actual stream-size bound remains independently tested. Amended and pushed the commit; Windows CI will verify the platform-specific path.

Copilot

🟡 Changes recommended

Markdown and baseline diagnostics still permit terminal-direction manipulation through unsanitized text.

3 open findings

🧠 Review effort: Balanced

Copilot

🟡 Changes recommended

Schema-9 validation accepts confidence bounds without their required confidence level.

1 open finding

Reject confidence intervals with null confidence levels · New

3 resolved since last review

🧠 Review effort: Balanced

Copilot

🟡 Changes recommended

Repository report generators remain incompatible with schema 9, and the documented native smoke behavior differs from the implementation.

3 open findings

🧠 Review effort: Balanced

Copilot

🔵 Needs a closer look

It combines proc-macro generation, unsafe allocator routing, cross-platform process control, and report-schema migration without full workspace, Miri, or mutation validation.

0 open findings

3 resolved since last review

🧠 Review effort: Balanced

Copilot

🟡 Changes recommended

Schema-9 validation still permits Criterion timing metrics without the statistic needed for safe baseline comparison.

1 open finding

Require statistic for criterion/time metrics in schema 9 · New

🧠 Review effort: Balanced

Copilot

🟡 Changes recommended

Derived probe identities can collide, and existing benchmark snapshots are mislabeled as newly computed primary estimates.

3 open findings

1 resolved since last review

Require statistic for criterion/time metrics in schema 9

🧠 Review effort: Balanced

Copilot

🟡 Changes recommended

Schema validation and rejected-baseline diagnostic sanitization remain incomplete.

2 open findings

3 resolved since last review

🧠 Review effort: Balanced

Copilot

🟡 Changes recommended

User-controlled probe arguments can inject terminal control sequences into the new probe error diagnostic.

1 open finding

Escape user-controlled probe errors before terminal output · New

2 resolved since last review

🧠 Review effort: Balanced

Copilot

🔵 Needs a closer look

The broad cross-platform worker, allocator, unsafe, macro-generation, and report-publication changes warrant final human review.

0 open findings

1 resolved since last review

Escape user-controlled probe errors before terminal output

🧠 Review effort: Balanced

- Keep benchmark bodies and ordinary adapters free of collection controls by generating private allocation, perf, and VTune callers from native cases. - Gate alloc_tracker behind the same underlying allocator instance and bypass tracking in ordinary workers; isolate collectors by validated worker mode. - Report Criterion slope or mean estimates with confidence metadata, validate bootstrap intervals, and compare baselines using the build-time compiler. - Preserve explicit native case identities, use executable-derived artifact roots, and prevent empty, smoke, failed, or partial runs replacing baselines. - Bound artifact reads using regular-file handles, create worker logs exclusively, and encode less-trusted terminal and Markdown output. - Add structural macro, indexed protocol, lifecycle, cross-thread allocation, and collector-failure regressions, including generated-name collision checks. - Require Linux native listing and smoke contracts in CI and update generated crate documentation and native-contract guidance. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: 2cbef463-84aa-4249-91e4-20ba418301f6

Copilot

🔵 Needs a closer look

It substantially changes unsafe allocation instrumentation, cross-platform process control, reporting, and generated macro behavior without full-workspace or runtime-analysis validation.

0 open findings

🧠 Review effort: Balanced

github-actions · 2026-10-11T21:23:36Z

⚠️ SemVer check advisory

Inconclusive comparisons

cargo semver-checks could not complete the following comparisons. These failures are informational because an unbuildable baseline is not evidence of a breaking API change.

`metabench` (exit 101)

     Cloning cb3ef36dc0942dc93017df934a3fcacfc7f451ad
    Building metabench v0.1.1 (current)
       Built [  18.804s] (current)
     Parsing metabench v0.1.1 (current)
      Parsed [   0.013s] (current)
    Building metabench v0.1.1 (baseline)
error: running cargo-doc on crate 'metabench' failed with output:
-----
   Compiling proc-macro2 v1.0.107
   Compiling quote v1.0.47
   Compiling unicode-ident v1.0.26
   Compiling serde_core v1.0.229
   Compiling serde v1.0.229
   Compiling zmij v1.0.23
   Compiling serde_json v1.0.154
   Compiling libc v0.2.190
    Checking cfg-if v1.0.5
    Checking itoa v1.0.18
   Compiling syn v3.0.8
   Compiling syn v2.0.119
    Checking memchr v2.8.3
   Compiling zerocopy v0.8.62
    Checking bitflags v2.13.2
   Compiling hashbrown v0.17.1
   Compiling shlex v2.0.1
   Compiling rustversion v1.0.23
   Compiling winnow v1.0.4
   Compiling equivalent v1.0.2
   Compiling find-msvc-tools v0.1.14
   Compiling semver v1.0.28
   Compiling rustc_version v0.4.1
   Compiling cc v1.8.0
   Compiling toml_parser v1.1.5+spec-1.1.0
   Compiling serde_derive v1.0.229
   Compiling indexmap v2.14.2
   Compiling zerocopy-derive v0.8.62
   Compiling derive_more-impl v2.1.1
   Compiling rustix v1.1.5
   Compiling toml_datetime v1.1.2+spec-1.1.0
   Compiling autocfg v1.5.1
   Compiling num-traits v0.2.19
   Compiling toml_edit v0.25.17+spec-1.1.0
    Checking either-or-both v0.3.1
   Compiling alloca v0.4.0
   Compiling gungraun-macros v0.9.1
   Compiling proc-macro-error-attr3 v3.1.1
    Checking regex-syntax v0.8.11
   Compiling thiserror v2.0.21
    Checking ciborium-io v0.2.2
   Compiling getrandom v0.4.3
    Checking linux-raw-sys v0.12.1
   Compiling cfg_aliases v0.2.2
    Checking either v1.19.0
   Compiling bincode-next v3.1.1
    Checking anstyle v1.0.14
    Checking clap_lex v1.1.1
    Checking itertools v0.13.0
    Checking clap_builder v4.6.7
    Checking regex-automata v0.4.18
    Checking half v2.7.1
    Checking ciborium-ll v0.2.2
   Compiling nix v0.31.3
   Compiling proc-macro-error3 v3.1.1
    Checking rapidhash v4.5.1
   Compiling proc-macro-crate v3.5.0
   Compiling derive_more v2.1.1
   Compiling thiserror-impl v2.0.21
   Compiling gungraun v0.19.4
    Checking same-file v1.0.6
   Compiling pastey v0.2.3
    Checking cast v0.3.0
    Checking unty-next v0.1.2
    Checking criterion-plot v0.8.2
    Checking walkdir v2.5.0
    Checking regex v1.13.1
   Compiling metabench_macros_impl v0.1.1 (/home/runner/work/oxidizer/oxidizer/target/semver-checks/git-cb3ef36dc0942dc93017df934a3fcacfc7f451ad/5e0aa86380776f0db5a91dc7d93ae494706f69b9/crates/metabench_macros_impl)
    Checking gungraun-runner v0.20.0
    Checking ciborium v0.2.2
    Checking clap v4.6.7
    Checking gungraun-runner v0.19.4
    Checking folo_utils v0.1.14
    Checking tinytemplate v1.2.1
    Checking nix v0.27.1
    Checking page_size v0.6.0
    Checking oorandom v11.1.5
    Checking fastrand v2.5.0
    Checking once_cell v1.21.4
   Compiling metabench v0.1.1 (/home/runner/work/oxidizer/oxidizer/target/semver-checks/git-cb3ef36dc0942dc93017df934a3fcacfc7f451ad/5e0aa86380776f0db5a91dc7d93ae494706f69b9/crates/metabench)
    Checking jiff-core v0.1.1
    Checking anes v0.1.6
    Checking criterion v0.8.2
    Checking gungraun-summary v6.0.0
error[E0432]: unresolved import `gungraun_runner::api::ValgrindTool`
  --> /home/runner/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/gungraun-summary-6.0.0/src/v6.rs:10:59
   |
10 |     CachegrindMetric, DhatMetric, ErrorMetric, EventKind, ValgrindTool,
   |                                                           ^^^^^^^^^^^^ no `ValgrindTool` in `api`

error[E0432]: unresolved imports `gungraun_runner::metrics::model::MetricsDiff`, `gungraun_runner::metrics::model::MetricsSummary`
  --> /home/runner/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/gungraun-summary-6.0.0/src/v6.rs:12:63
   |
12 | pub use gungraun_runner::metrics::model::{Metric, MetricKind, MetricsDiff, MetricsSummary};
   |                                                               ^^^^^^^^^^^  ^^^^^^^^^^^^^^ no `MetricsSummary` in `metrics::model`
   |                                                               |
   |                                                               no `MetricsDiff` in `metrics::model`

error[E0432]: unresolved imports `gungraun_runner::summary::model::Diffs`, `gungraun_runner::summary::model::FlamegraphSummary`, `gungraun_runner::summary::model::ProfileInfo`, `gungraun_runner::summary::model::SummaryFormat`, `gungraun_runner::summary::model::SummaryOutput`, `gungraun_runner::summary::model::ToolMetricSummary`
  --> /home/runner/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/gungraun-summary-6.0.0/src/v6.rs:14:38
   |
14 |     BenchmarkKind, BenchmarkSummary, Diffs, FlamegraphSummary, Profile, ProfileData, ProfileInfo,
   |                                      ^^^^^  ^^^^^^^^^^^^^^^^^                        ^^^^^^^^^^^ no `ProfileInfo` in `summary::model`
   |                                      |      |
   |                                      |      no `FlamegraphSummary` in `summary::model`
   |                                      no `Diffs` in `summary::model`
15 |     ProfilePart, ProfileTotal, Profiles, SCHEMA_VERSION, SummaryFormat, SummaryOutput,
   |                                                          ^^^^^^^^^^^^^  ^^^^^^^^^^^^^ no `SummaryOutput` in `summary::model`
   |                                                          |
   |                                                          no `SummaryFormat` in `summary::model`
16 |     ToolMetricSummary, ToolRegression,
   |     ^^^^^^^^^^^^^^^^^ no `ToolMetricSummary` in `summary::model`

For more information about this error, try `rustc --explain E0432`.
error: could not compile `gungraun-summary` (lib) due to 3 previous errors
warning: build failed, waiting for other jobs to finish...

-----

error: failed to build rustdoc for crate metabench v0.1.1
note: this is usually due to a compilation error in the crate,
      and is unlikely to be a bug in cargo-semver-checks
note: the following command can be used to reproduce the error:
      cargo new --lib example &&
          cd example &&
          echo '[workspace]' >> Cargo.toml &&
          cargo add --path /home/runner/work/oxidizer/oxidizer/target/semver-checks/git-cb3ef36dc0942dc93017df934a3fcacfc7f451ad/5e0aa86380776f0db5a91dc7d93ae494706f69b9/crates/metabench &&
          cargo check &&
          cargo doc

error: aborting due to failure to build rustdoc for crate metabench v0.1.1

codecov · 2026-10-11T22:00:14Z

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.0%. Comparing base (cb3ef36) to head (f282f88).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #807   +/-   ##
=======================================
  Coverage   100.0%   100.0%           
=======================================
  Files         798      796    -2     
  Lines      119402   119357   -45     
=======================================
- Hits       119402   119357   -45

Flag	Coverage Δ
linux	`100.0% <ø> (ø)`
linux-arm	`100.0% <ø> (ø)`
scheduled	`?`
windows	`100.0% <ø> (ø)`

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Martin Taillefer (geeknoid) commented Oct 11, 2026

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github-actions Bot commented Oct 11, 2026

⚠️ SemVer check advisory

Inconclusive comparisons

metabench (exit 101)

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codecov Bot commented Oct 11, 2026

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`metabench` (exit 101)