refactor(cli): subprocess architecture - #249
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- Delete metaltile-core/src/toolchain/ entirely
- Move bench.rs + test.rs → metaltile/src/harness/{bench,test}.rs
- KernelBenchEntry, KernelTestEntry, KernelBench, KernelTest now live
in the facade; inventory::collect! for both entry types in harness/registry.rs
- Move protocol.rs → metaltile-core/src/protocol.rs (stays in core so
the CLI can import ProtocolMessage without pulling GPU deps)
- Extract KernelEntry + all_kernels() → metaltile-core/src/registry.rs
(stays in core so metaltile-codegen can use it without a circular dep)
- Delete toolchain/config.rs (will be recreated in CLI in a later step)
- Drop toml dep from metaltile-core/Cargo.toml
- Add inventory + serde deps to metaltile/Cargo.toml
- Update macro type paths: ::metaltile::core::bench::* → ::metaltile::harness::bench::*
and ::metaltile::core::KernelBenchEntry → ::metaltile::harness::bench::KernelBenchEntry
(inventory::submit! path via ::metaltile::core::inventory unchanged)
- Update metaltile/src/test.rs to re-export from harness instead of core::bench
- Update metaltile-std/src/lib.rs re-export of all_benches/all_tests/all_kernels
- Update call sites in metaltile-cli and metaltile-std that used
metaltile_core::all_benches/all_tests to use metaltile::harness::registry
…tile-core KernelEntry and all_kernels() are runner concerns — the CLI never calls them. Keeping them in metaltile-core was wrong because core is the only dep the CLI will have after Step 11. - Add metaltile-codegen/src/kernel_registry.rs with KernelEntry, collect!, and all_kernels() — co-located with KernelInlinePass that uses them - Add inventory dep to metaltile-codegen/Cargo.toml - Update KernelInlinePass to import all_kernels from crate::kernel_registry - Remove registry.rs from metaltile-core entirely - Update metaltile-core/src/lib.rs: drop pub mod registry and KernelEntry re-export; keep pub use inventory for the macro submit! path only - Update metaltile::harness::registry to re-export KernelEntry + all_kernels from metaltile_codegen (single registry surface for the runner) - Update #[kernel] macro: KernelEntry path is now metaltile::harness::registry::KernelEntry (was metaltile::core::KernelEntry) - Fix metaltile/src/prelude.rs: KernelEntry re-export via harness::registry
Add BuildResult, Artifact, Inspect variants and supporting types (ArtifactKind, InspectKind, BuildError, ProfileInfo). Update Start with command/total fields and Done with ok flag. Add profile field to BenchResult. Full roundtrip tests for all variants.
Move GpuRunner + BenchStats from metaltile-std into metaltile::runner::gpu. Add RunnerArgs (subprocess arg parsing), emit (ProtocolMessage → stdout), and RunnerHarness (orchestrates bench/test/build/inspect against the inventory registries). metaltile-std runner.rs is unchanged for now (Step 4).
…robe/ GpuRunner + BenchStats now live in metaltile::runner::gpu. run_kernel_test re-exported from metaltile::runner. run_kernel_bench moved inline to metaltile-cli/cmd/bench.rs (its only caller). metaltile-std drops all Metal/objc2/metaltile-runtime direct deps.
Steps 5-8: scaffolding - config.rs: TileConfig + ConfigLoader (figment: defaults → tile.toml → TILE__* env) - harness.rs: Harness struct owning TileConfig; from_config() factory - project_runner.rs: ProjectRunner + RunnerInvocation; Phase 1 delegates in-process to RunnerHarness::run; RunnerArgs::parse made pub - cmd/mod.rs: TileCommand trait (fn run(&self, harness: &Harness)) Steps 9-10: command structs + SuitePrinter - BenchCommand/TestCommand/BuildCommand/InspectCommand implement TileCommand - main.rs dispatches bench/test/build/inspect through trait - SuitePrinter::from_harness() factory reads verbose from config - SuitePrinter::print_bench_result() Phase 2 protocol-message display path Step 11: strip direct metaltile-runtime dep from CLI - Re-export GpuFamily through metaltile::runner - cmd/device.rs, cmd/snap.rs updated to use metaltile::runner::GpuFamily - metaltile-runtime removed from metaltile-cli Cargo.toml Step 12: tile init command - Scaffolds Cargo.toml + src/lib.rs (sample #[kernel]/#[bench_kernel]) + tile.toml - InitCommand implements TileCommand; --force flag to overwrite
- needless_return: drop return keyword from cfg-gated blocks in runner/gpu.rs (read_bytes, read_f32_slice, read_bf16_slice, read_f16_slice, measure, supports_simd_matrix) - map_or_true: replace .map_or(true, |f| …) with .is_none_or(|f| …) in runner/harness.rs (4 filter sites) - too_many_arguments: #[allow] on run_reference (harness.rs) and run_reference_bench (bench.rs) — 8-arg helper fns, refactor deferred - collapsible_if: flatten nested if-let in run_kernel_bench (bench.rs) - result_large_err: box figment::Error in ConfigLoader::load signature
0xClandestine
changed the title
…arison-and-plan.md
TileConfig gains `runs` (default 10) and `warmup_runs` (default 15). BenchCommand::run now passes harness.config values to run(), which threads them through run_kernel_bench/run_reference_bench into bench_gbps_with() so tile.toml and TILE__ env vars control iteration counts without recompilation. tile.toml updated to document both fields.
Add bench_gbps_with() accepting explicit warmup/iters so CLI config can override compile-time defaults. bench_gbps delegates to it. TileConfig gains runs/warmup_runs fields (defaults 10/15) wired through to bench_gbps_with via BenchCommand.
Blocking (CI + correctness): - gpu.rs: #[allow(too_many_arguments)] on bench_gbps_with → unblocks CI - project_runner.rs: fix --inspect → --kind in build_argv (B1) - cmd/init.rs: add metaltile = "0.1" to scaffolded Cargo.toml (B2) - runner/args.rs: add --warmup-runs/--runs flags; RunnerArgs gains warmup/iters fields (B3) - runner/harness.rs: thread warmup/iters through run_bench → run_one_bench → bench_gbps_with and run_reference (B3) - config.rs: fix brittle ConfigLoader test to use explicit provider path instead of CWD; assert all default field values (B4) Quality / correctness: - runner/emit.rs: log IO errors in emit_stdout instead of discarding (C1) - harness.rs: eprintln → tracing::warn! for config fallback (C2) - run_one_bench: emit diagnostic when buffer name not found in setup (C4) API / naming: - config.rs: verbose: bool → verbose: u8 (0/1/2 levels); tile.toml updated; TILE__VERBOSE doc updated (D2) - suite_printer.rs: from_harness uses verbose u8 directly (D2) - harness/bench.rs: add ConstValue::to_le_bytes() (D3) - runner/harness.rs + cmd/bench.rs: replace duplicate constexpr_bytes helpers with ConstValue::to_le_bytes() (D3) - project_runner.rs: add warmup_runs/runs fields to RunnerInvocation so Phase 2 subprocess wiring can pass config values through
- config.rs: drop double-underscore figment split; TILE_FOO now maps to TileConfig.foo
- init.rs: use env!("CARGO_PKG_VERSION") for metaltile/metaltile-std deps; fix verbose=false→0
- tile.toml: update env-var comment to reflect TILE_* prefix
ekryski
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Jun 1, 2026
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Reviewed at cb2635c. Nice work — the earlier compile breaks + the audit findings are already addressed and the lib builds clean. A few things still need fixing before CI goes green, plus a couple of gaps to flag.
Blockers (CI red):
- Test targets don't compile.
metaltile-runtimewas dropped frommetaltile-std's deps, but 28 files incrates/metaltile-std/tests/stilluse metaltile_runtimedirectly (e.g.sdpa_decode_swa_gpu,moe_gather_qmm_mpp_bm8_int8,gated_delta_prep_step,kernel_tests_harness).Clippy + Tests/Suitefail on this. Inline note on the Cargo.toml. - Format CI failing —
cargo fmthasn't been applied to the latest commits.
Gaps (not blockers):
- Step 11 "strip GPU from CLI" isn't actually achieved — the CLI still pulls
metaltile-runtimetransitively via themetaltilefacade. Fine for Phase-1-in-process, but the body overstates it. Inline note. protocol::ProfileInfooverlaps PR #247'sKernelProfile— should be reconciled into one type. Inline note.- FYI: the "subprocess" is still Phase-1 in-process (
ProjectRunnerdelegates toRunnerHarness::run); the real spawn / stream / crash-handling paths aren't exercised yet. Well-documented in code — just flagging so it's not assumed tested.
Crate surgery + protocol versioning look clean. Once the test deps + fmt are sorted it should go green.
| objc2-metal.workspace = true | ||
| objc2-foundation.workspace = true | ||
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| [dev-dependencies] |
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Blocker: dropping metaltile-runtime from std breaks 28 integration tests under tests/ that still use metaltile_runtime directly (sdpa_decode_swa_gpu, moe_gather_qmm_mpp_bm8_int8, gated_delta_prep_step, kernel_tests_harness, …) — the test targets fail to compile, so Clippy + Tests / Suite go red.
Quickest unblock: re-add metaltile-runtime.workspace = true under [dev-dependencies]. Cleaner (matches the std→facade direction): migrate those tests to metaltile::runner::*.
| @@ -18,11 +18,11 @@ path = "src/main.rs" | |||
| thiserror.workspace = true | |||
| metaltile.workspace = true | |||
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Step 11 ("strip metaltile-runtime from CLI") is only cosmetic as-is: the CLI still depends on the metaltile facade here (plus -codegen/-std), and metaltile pulls in metaltile-runtime transitively — so tile still links the GPU stack. Expected while ProjectRunner runs in-process (Phase 1), but the body's "CLI retains only metaltile-core" isn't true yet. Worth rewording now, and dropping the facade dep once the real subprocess spawn lands.
| /// | ||
| /// Populated when the runner is invoked with profiling enabled. | ||
| #[derive(Debug, Clone, Serialize, Deserialize)] | ||
| pub struct ProfileInfo { |
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ProfileInfo overlaps PR #247 (ek/bench-metrics), which independently defines KernelProfile + classify_bottleneck() in metaltile-std/src/profile.rs (latency µs / GFLOP·s / roofline / bottleneck). Same concept, two types. Whichever merges second should make ProfileInfo the serialized form of KernelProfile rather than a parallel definition — otherwise the metric schema diverges across the wire boundary.
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I think we merge this first and I will resolve my PR #247 afterwards.
probe/mma_layout_probe.rs and probe/mpp_matmul_smoke.rs were deleted in the runner refactor but their integration tests were left behind, causing E0432/E0433 compile errors under --all-targets clippy. - Restore src/probe/mma_layout_probe.rs (two #[kernel] MMA probe fns) - Restore src/probe/mpp_matmul_smoke.rs (CoopTile smoke kernel_ir()) - Add `pub mod probe` to lib.rs - Add metaltile-runtime to [dev-dependencies] (needed by GPU test files)
- tile bench header now shows "warmup=N runs=N" beside device name - warmup_runs default: 15 → 3 (faster iteration during development) - tile.toml and config.rs tests updated to match
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Proposed changes
Implements the subprocess rewrite plan for the
tileCLI (steps 1–12).The
tilebinary is being migrated from an in-process GPU runner to a thinJSON-Line parser that delegates all GPU/kernel work to a
__tile_runnersubprocess. This PR completes the scaffolding and first integration layer.
What changed
Steps 1–2 — Protocol (
metaltile-core)ProtocolMessagewithBuildResult,Artifact,Inspect,updated
Start/Done/BenchResult; addedArtifactKind,InspectKind,BuildError,ProfileInfo.from_json_linestrips trailing\n.Steps 3–4 —
metaltile::runnermodule + std cleanupmetaltile::runner::{gpu, emit, args, harness}sub-modules.GpuRunner,CompiledKernel,GpuBuffer,BenchStatsmoved frommetaltile-stdintometaltile::runner::gpu.RunnerHarnessorchestrates bench/test/build/inspect, emittingProtocolMessageJSON lines to stdout.RunnerArgs::parse+from_env_argsfor subprocess arg parsing.run_kernel_test/TestOutcomefor legacy in-process compat.metaltile-std/{runner,run_kernel,stats,error,probe}modules;all consumers updated to
metaltile::runner::*.Steps 5–8 — CLI scaffolding
config.rs:TileConfig+ConfigLoader(figment layers: defaults →tile.toml→TILE__*env vars;figmentadded to workspace).harness.rs:Harnessstruct owning config;from_config()factory.project_runner.rs:ProjectRunner+RunnerInvocation; Phase 1delegates in-process to
RunnerHarness::run.cmd/mod.rs:TileCommandtrait (fn run(&self, harness: &Harness)).Steps 9–10 — Command structs + SuitePrinter
BenchCommand,TestCommand,BuildCommand,InspectCommandimplementTileCommand;main.rsdispatches through trait.SuitePrinter::from_harness()reads verbose from config.SuitePrinter::print_bench_result(&ProtoBenchResult)— Phase 2 protocoldisplay path using
metaltile-core::protocoldirectly.Step 11 — Strip
metaltile-runtimedep from CLIGpuFamilyre-exported viametaltile::runner.cmd/device.rs,cmd/snap.rsupdated;metaltile-runtimeremoved frommetaltile-cli/Cargo.toml.Step 12 —
tile initCargo.toml+src/lib.rs(sample#[kernel]/#[bench_kernel])tile.tomlin a new project directory.InitCommandimplementsTileCommand;--forceflag for overwrites.Crates affected
metaltile-core(IR types, ops)metaltile-macros(proc macros, body parser)metaltile-codegen(MSL lowering, passes)metaltile-runtime(Metal dispatch)metaltile-std(kernel stdlib, op files)metaltile-cli(tilebinary)Testing
cargo check --workspace— clean (0 errors, 0 warnings)cargo clippy --workspace— clean (0 issues after fixes)cargo fmt --all— cleanmetaltile-stdandmetaltile-coreunaffectedRunnerArgsparse tests added inmetaltile::runner::argsTileConfig/ConfigLoaderunit tests inconfig.rsChecklist
make clippypasses cleanmake test --workspacepassesmake fmt-checkpassesmake typospasses (ortyposis clean)