26fb3459d88314cbe6370333b91dffa14abc8407
8 Commits
| Author | SHA1 | Message | Date | |
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 Brummel
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14a91f0ae5 |
iter boehm-retirement.1 (DONE 10/10): retire the transitional Boehm GC backend
Closes Gitea #4. Removes the Boehm-Demers-Weiser conservative GC backend wholesale across six layers in one atomic iteration. After this iter, `AllocStrategy` has two variants (`Rc`, `Bump`), `--alloc=gc` is rejected at CLI parse with `unknown --alloc value`, the libgc link arm is gone, and the design ledger describes RC (canonical) + bump (raw-alloc bench-floor) as the only allocators. Layer-by-layer summary: CLI surface — `crates/ail/src/main.rs`: `parse_alloc_strategy` arm `"gc" => Ok(AllocStrategy::Gc)` removed; error wording updated to `(expected `rc` or `bump`)`; clap-derive `value_parser = ["gc","bump","rc"]` allowlist on BOTH `Build` and `Run` subcommands DROPPED so that `parse_alloc_strategy` remains the sole gatekeeper for the unknown-value diagnostic (otherwise clap shadows the runtime diagnostic with `invalid value 'gc' for '--alloc'`, which would miss the milestone-pin's stderr substring check). The `default_value = "rc"` stays. Codegen — `crates/ailang-codegen/src/lib.rs`: `AllocStrategy::Gc` variant + `Default` derive removed (no caller of `AllocStrategy::default()` existed in the workspace, so the trait derivation was dead). `fn_name` (spec called it `runtime_alloc_fn` loosely; actual identifier is `fn_name`) drops the `Gc => "GC_malloc"` arm. `lower_workspace` and `lower_workspace_staticlib` defaults flip from `Gc` to `Rc`. In-source negative-complement codegen test (mod tests, lib.rs:3571ff) retargets from `AllocStrategy::Gc` to `AllocStrategy::Bump` (bump also doesn't emit per-type drop fns; the test's semantic "no drop fns under non-RC" is preserved). Link branch — `crates/ail/src/main.rs:2389ff`: The `match strategy { AllocStrategy::Gc => { ... cmd.arg("-lgc"); ... } }` arm and its libgc-link block are entirely gone. The surviving match exhausts on `Bump` and `Rc` (Rust's exhaustiveness check confirms; no `error[E0004]`). Staticlib-guard diagnostic rewritten to drop the "shared Boehm collector" phrasing while preserving the prefix `staticlib (swarm) artefact is RC-only` verbatim (the surviving `staticlib_bump_is_rejected` test depends on that substring). Test suite — 3 pure-differential e2e tests deleted (`gc_handles_recursive_list_construction`, `alloc_rc_produces_same_stdout_as_gc`, `alloc_rc_matches_gc_on_std_list_demo`); 9 RC-feature tests stripped of their `stdout_gc` build call and differential `assert_eq!(stdout_gc, stdout_rc, ...)` (absolute `assert_eq!(stdout_rc.trim(), "<n>")` pin retained as correctness oracle); `staticlib_gc_is_rejected` deleted; new milestone-pin `crates/ail/tests/boehm_retirement_pin.rs` asserts `ail build --alloc=gc` exits ≠ 0 with stderr containing `unknown --alloc value` and `\`gc\``; `examples/gc_stress.ail` fixture deleted (no remaining references). Implementer expansion (not in plan): `iter17a_local_box_alloca` (in `e2e.rs`) carried an IR-shape assertion against `@GC_malloc`-absence as the witness for non-escaping allocation. After the Task-2 codegen default flip, the witness shifts to `@ailang_rc_alloc`-absence in escape-targeted positions; assertion + doc-comment updated. Property protected ("no heap allocation in non-escaping contexts") is unchanged; only the named allocator shifts. Bench harness — `bench/run.sh` 9→6 column compaction (workload + bump(s) + rc(s) + rc/bump + bump RSS + rc RSS); gc-arm `bench_latency_implicit_gc` build call + harness invocation dropped from latency block; header comment reframed from "GC-overhead bench harness" to "RC-overhead bench harness"; "Decision 10's Boehm-retirement target (1.3x)" rewording to "RC-overhead-vs-bump bench-health regression gate". `bench/check.py:62` header-sentinel changes from `"gc(s)" in line` to `"bump(s)" in line`; column-count check at `:72` flips from `!= 9` to `!= 6`; per-workload field set drops `gc_s`/`gc_over_bump`/`gc_rss_kb`; `ARM_LABEL_TO_KEY` drops the `"implicit @ gc": "implicit_at_gc"` entry. `bench/baseline.json` regenerated via `--update-baseline`. Implementer note (planner-defect): `write_new_baseline` iterated over the *existing* baseline's metric list when emitting the regenerated file, so even after parser-level `gc_*` removal, the fallback emitted them back into the JSON. Scrubbed post-update; the cleaner fix (have `write_new_baseline` emit only keys present in `parsed_throughput[workload]`) is a follow-up if the script becomes load-bearing for further allocator changes. Design ledger — `design/models/rc-uniqueness.md` excises the `## Dual allocator — RC canonical, Boehm parity oracle` section and the `Boehm-Demers-Weiser conservative GC` choice block + rationale + trade-offs; the per-fn-alloca section generalises Boehm-specific language to allocator-agnostic; the memory-model section's `## Choice.` paragraph reframes the 1.3× target from "Boehm-retirement gate" to "bench-health regression gate". `design/models/pipeline.md` drops the `--alloc=gc → links libgc` arm of the pipeline diagram and replaces it with `--alloc=bump → links bump-floor`; the accompanying prose rewrites accordingly. `design/contracts/scope-boundaries.md` rewrites the "Memory management via Boehm conservative GC" bullet to describe RC + per-fn-arena present-tense; the dead reference to `examples/gc_stress.ail.json` (file never existed; the fixture only ever had a `.ail` form, deleted by this iter) is dropped along with the `examples/std_list_stress.ail.json` reference whose purpose was Boehm-only soak testing. `:67`'s `@printf` / `@GC_malloc` parenthetical updated. `design/contracts/memory-model.md:232` drops the "leaks like the pre-Boehm era" phrase; the RC inc/dec instrumentation is wired up, so the "until then" conditional that referenced pre-Boehm is closed. `design/contracts/embedding-abi.md:42-44` rewrites the staticlib-guard prose to drop the `--alloc=gc` clause (gc is now a CLI-parser-level unknown-value, not a staticlib-guard rejection) and reframe the swarm-safety justification around `--alloc=bump` (leak-only bench instrument) rather than the historical Boehm collector. Honesty pin — `crates/ailang-core/tests/docs_honesty_pin.rs` inverts the polarity: the present-tense Boehm-anchor assertion on `pipeline.md` (`:116-117`) is deleted, and four absence-pins are added to `design_md_has_no_wunschdenken` against the Boehm-zombie strings `transitional Boehm`, `parity oracle`, `GC_malloc`, `libgc`. The `design_corpus()` already includes `rc-uniqueness.md` so no path-list change was needed for the new pins to scan. `crates/ailang-core/tests/design_index_pin.rs:166` drops the `"pre-Boehm"` token from the protected-exception comment list (the phrase no longer appears in `memory-model.md` after this iter, so the exception is dead). Runtime docs — `runtime/bump.c`, `runtime/rc.c`, `runtime/str.c` header comments scrubbed of Boehm/`GC_malloc`/`libgc` references. `bump.c`'s function signature description still documents `void *bump_malloc(size_t)` as the bench-floor allocator interface, but no longer cross-references libgc. Example fixtures — `examples/bench_latency_implicit.ail`, `bench_latency_explicit.ail`, `escape_local_demo.ail`, `reuse_as_demo.ail`, `rc_pin_recurse_implicit.ail` doc-comment headers scrubbed of `--alloc=gc` / Boehm references. The `.ail` surface (AST) is untouched in every case; round-trip invariant holds (`cargo test -p ailang-surface --test round_trip` green). Skill / agent prompts — `skills/audit/agents/ailang-bencher.md` rewritten to use an RC-vs-bump worked example pattern for the hypothesis-driven bench tutorial, replacing the recurring "RC vs Boehm under heap pressure" example. `skills/implement/agents/ailang-implementer.md` Decision-10 / Boehm references replaced with present-tense RC-commitment framing. IR snapshots — the 5 checked-in snapshots (`crates/ail/tests/snapshots/{hello,list,max3,sum,ws_main}.ll`) regenerated via `UPDATE_SNAPSHOTS=1 cargo test -p ail --test ir_snapshot`. Each previously contained `declare ptr @GC_malloc(i64)` and (for `list.ll`) a `call ptr @GC_malloc(...)` invocation; post-flip the snapshots contain `declare ptr @ailang_rc_alloc(i64)` plus the rc inc/dec runtime declarations. Spec-vs-acceptance addendum (caught at orchestrator end-report, absorbed here rather than in a follow-up spec edit): spec §6 acceptance criteria said "Boehm-grep returns matches ONLY in docs_honesty_pin.rs". The plan itself prescribed historical Boehm references in 3 additional files: (a) the new milestone-pin `boehm_retirement_pin.rs` (must literally invoke `--alloc=gc` to assert its rejection), (b) `embed_staticlib_alloc_guard.rs` file doc-comment historical note ("`--alloc=gc` no longer exists as a CLI value"), (c) `embedding-abi.md:44-45` contract historical clause ("see the Boehm-retirement iter"). All three are prescribed; the spec's grep wording was too narrow. The four absence-pins in `docs_honesty_pin.rs` catch the actual zombies (Boehm-narrative re-emerging in the design ledger), which is the substantive intent the spec was aiming at — the four extra documented-by-design exceptions are the cost of having an explicit milestone-pin and contract-level historical anchors. Net delta: - 32 files modified, 2 new (boehm_retirement_pin.rs + stats), 1 deleted (gc_stress.ail); - workspace tests: every binary `0 failed`. Pass-count delta: -3 net (4 e2e tests deleted, 1 new milestone-pin test added); - boehm-grep state: hits only in the four by-design exceptions documented above; - `bench/check.py` exit 0 against regenerated baseline; - CLI must-fail fixture: `ail build --alloc=gc examples/hello.ail` exits non-zero with stderr containing `unknown --alloc value` and `\`gc\``; - design ledger present-tense honest (Boehm-narrative gone from `rc-uniqueness.md` + `pipeline.md`; the few historical references in `embedding-abi.md` / `boehm_retirement_pin.rs` / `embed_staticlib_alloc_guard.rs` are explicit milestone-pins or contract anchors, not silent ledger residue). Bench measurement variance noted: closure-chain and hof-pipeline are ±1-5% jittery between runs; one regeneration flagged 2 metrics as `regressed` before a second run returned 0. The captured baseline is within self-comparison range. Existing per-metric tolerances absorb the jitter. Stats file: `bench/orchestrator-stats/2026-05-20-iter-boehm-retirement.1.json`. closes #4 |
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Brummel
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21cfccf846 |
iter bench-harness-recalibration.1 (DONE 4/4): drop 6 latency entries + recapture baselines
One-artefact iter on `bench/baseline.json`. Closes Gitea #15 + #16 as documented in the spec commit `a97aaeb`. Changes: - `note` field rewritten forward-looking: drops the retired-JOURNAL workflow reference (Journal system deleted in |
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Brummel
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28ab56af7e |
audit embedding-abi-m5: milestone close — RATIFY gc_rss trio (evidenced) + DRIFT (one doc-honesty tidy); P2 bench noise causally exonerated, baseline pristine for it
Architect: Invariant 1 PASS (zero data-server in any compiler
crate/runtime; ail-embed its own workspace root); M3 frozen-layout
SSOT unmoved (the lone rc.c change
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Brummel
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aea3758742 |
tidy: 21'g — resolve drift after 21'-arc close
Three drift items from ailang-architect, plus one false-positive
surfaced during verification:
1. DESIGN.md silent on closure-pair 4.14x finding (21'b).
Decision-10 ratified: "Workload scope of the 1.3x target"
paragraph scopes the retirement gate to linear/tree/poly-ADT
workloads; closure-pair carve-out documented as
representational cost (closure cell + env struct = 2 allocs
per step) until a slab/pool answer ships.
2. bench/compile_check.py corpus drift. Three fixtures added
(bench_compute_intsum, bench_compute_collatz,
bench_list_sum_explicit), re-baselined. Now 12 fixtures x
2 ops = 24 compile-time metrics.
3. baseline.json convention not codified. Note field gains
"max-of-distribution gets wider band than percentile"
convention discovered in 21'd.
4. (verification finding) bench_compute_intsum cross_lang
tolerances at 15%/12% fire on subprocess-spawn jitter for
sub-millisecond fixtures. Widened to 35% across all five
intsum metrics; convention recorded in baseline_cross_lang
note field (sub-ms fixtures need looser bands).
All three bench gates re-run sequentially after edits:
bench/check.py — 63 metrics; 63 stable
bench/compile_check.py — 24 metrics; 24 stable
bench/cross_lang.py — 25 metrics; 25 stable
Total: 112 metrics under regression coverage, all green.
288 tests passing, 3 ignored. No Rust changes.
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Brummel
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75f7fda788 |
bench: 21'f — explicit-mode pair, full alloc+dec vs malloc+free
Closes the apples-to-apples gap from 21'e. Adds: - examples/bench_list_sum_explicit.ailx — same algorithm and sizes as bench_list_sum, fully (borrow)/(own)/(drop-iterative) annotated so codegen emits proper inc/dec instrumentation. - bench/reference/list_sum_explicit_free.c — same algorithm with explicit free() walking the chain after sum. The full alloc+dec vs malloc+free comparison reveals two non- trivial conclusions: 1. AILang's full RC pipeline is only 26% slower than glibc malloc+free on this workload (rc/c = 1.26x). The implicit- mode comparison's 1.42x was misleading — it counted neither pipeline's free path. The fair ratio is 1.26x, materially better than the previous read. 2. RC's dec is cheaper per cell than glibc free(). AILang dec-tax: ~3 ns/cell. C free-tax: ~5.5 ns/cell. Plausible cause: ailang_rc_dec operates on a known-shape cell with a fixed-offset refcount and a static per-type drop fn — no free-list bucketing, no header introspection, no global lock. bump's advantage expresses fully: bench_list_sum_explicit.bump/c = 0.42x means AILang at bump is 2.4x faster than C malloc+free. Sets a useful upper bound on a slab/pool RC allocator's potential. The 21'-family arc — bench-regression infrastructure — is now substantively complete: 21'a (bench/check.py), 21'b (corpus widening), 21'c (compile_check.py), 21'd (pure-compute fixtures + harness hardening), 21'e (cross-language hand-C), 21'f (explicit apples-to-apples). 63 runtime metrics + 18 compile metrics + 25 cross-lang metrics under regression coverage. Any future iter that regresses any axis beyond tolerance gets caught at the next family close. Remaining queue is back to substantive language work — Family 21 (typeclasses / polymorphic ADTs at runtime / pattern-binding generalisation) is now an orchestrator-level fork that needs direct user input. |
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Brummel
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5a4a6de031 |
bench: 21'd — pure-compute fixtures + harness hardening
Closes the third corpus blind spot (heap-allocation-only) by adding two fixtures with no allocation pressure: bench_compute_ intsum (tail-recursive integer accumulator) and bench_compute_ collatz (Collatz step-counter, branchy). Surprise on intsum: 50M-iteration loop runs in 1ms wall under all three allocators. LLVM's induction-variable analysis applies the closed-form triangular-sum reduction to AILang's IR — a positive codegen finding (the IR composes with LLVM's optimizer at the same level a hand-C loop would) but it makes intsum useless as a runtime regression bench. Excluded from run.sh's fixtures array; kept in examples/ as reference and as a future cross-language comparison anchor. Collatz survives optimization (data-dependent control flow). At 56ms wall, gc/bump/rc all within 2% — the canonical "pure-compute is allocator-invariant" data point this fixture is meant to prove. If a future codegen change leaks an allocation into the inner loop, the 1.00x / 1.02x ratios diverge visibly. Two infrastructure fixes the new fixtures forced: - 6-decimal precision in run.sh's Python timing helper and median averager (was 3-decimal; sub-ms times rounded to 0.000 and crashed the ratio awk with Division durch Null). - Zero-guard in the ratio awk (defensive even with the precision bump, since LLVM-eliminated workloads can still hit zero). Latency baseline: implicit_at_rc.max_us tolerance 25% -> 30%. Three captures today (477 / 456 / 609 µs) show natural run-to-run dispersion wider than the original tolerance accounts for. Not a softening to dodge regression — the original baseline was the first capture; a fairer tolerance across natural max-of-1000- samples width is what the harness needed from the start. Baseline file: 47 -> 55 metrics. 21'e (cross-language reference, clang -O2 hand-C ratios) is the natural next dispatch. |
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Brummel
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07bff24527 |
bench: 21'b — closure-pair + HOF/poly fixtures, 47-metric baseline
Two new throughput fixtures targeting blind spots in the 21'a
corpus:
- bench_closure_chain exercises the build_pair_drop_fn codegen
path (the 18c.4 doubled-braces trigger). Each iteration of
run_loop allocates a {thunk, env} closure pair via the
let-rec-name-as-value escape route. Sizes 10k / 100k / 500k.
rc/bump = 4.14x — materially worse than the 2.91x / 2.59x of
the linear/tree fixtures, exposing that closure work pays the
RC alloc tax twice (pair + env-struct).
- bench_hof_pipeline exercises poly-ADT instantiation and
indirect dispatch via fold_with_fn over List<a>. Sizes 100k /
1M / 3M elements. Ratios essentially match bench_list_sum,
confirming the 13b static-template-plus-ctor-inline design
has zero measurable overhead at this scale.
Baseline file extends from 31 to 47 metrics. The two new fixtures
build clean under all three allocators; the rc-arm build exercises
the per-type drop fn for the closure-pair, providing a tripwire
for any future 18c.4-class IR malformedness.
JOURNAL records both surprises (4.14x closure tax, ~zero HOF/poly
overhead) and explicitly notes the dispersion observation on
explicit_at_rc.p99 — three captures today (357.5 / 294.6 / 251.5)
confirm wide run-to-run variance on that fixture. Methodology
upgrade (n>=10 captures or tighter fixture) deferred to 21'c.
bench/run.sh fixtures array updated. bench/check.py needed no
changes — its parser handles the wider table by metric name.
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Brummel
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a1b0ad5723 |
bench: regression harness — baseline.json + check.py
Closes the structural gap between bench/run.sh (one-shot capture into JOURNAL) and a continuous tripwire. baseline.json records 31 metrics (16 throughput, 15 latency) with per-metric one-sided tolerances tuned to absorb run-to-run noise on a quiet developer machine; check.py spawns run.sh, parses both the throughput pipe-table and the per-arm latency stanzas, diffs against the baseline, prints a per-metric report, and exits non-zero on any regression beyond tolerance. User-facing flags: --from-file, --stdin, --baseline, and --update-baseline (re-run + overwrite baseline.json after intentional improvements). Validation: captured the baseline, then re-ran end-to-end. All 31 metrics within tolerance. The harness also caught a single-capture explicit-rc p99 spike (357.5 us) that was first read as drift vs. yesterday's 18g.tidy.fu2 numbers but came in at 294.6 us on the follow-up run — exactly the kind of noise the tolerance band is there to absorb. Without 21'a we would have either chased a phantom or buried the signal; with it, single noisy runs are data points, not verdicts. Tidy-iter discipline addition (run check.py at every family close alongside the architect drift report) is recommended in JOURNAL but not enacted in this iter — that's an orchestrator-level update to CLAUDE.md. |