Refactor: hbg carries no per-ring dimension, and no ring-set wrapper - #1965
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📝 WalkthroughWalkthroughThe host-build-graph runtime now uses one shared ring. Task-window and heap settings are scalar values. Shared-memory APIs, runtime initialization, orchestration, scheduling, diagnostics, and unit tests were updated accordingly. ChangesSingle-ring host-build-graph runtime
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟡 Moderate · up to The refactor can accept a producer ID with a nonzero ring field and bind it to an unrelated ring-0 task, potentially producing incorrect task dependencies and scheduling behavior on both supported targets. This bounded correctness issue should be fixed before merging. Possibly related PRs
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Inline comments:
In
`@src/a2a3/runtime/host_build_graph/runtime/orchestrator_core/pto_orchestrator.cpp`:
- Around line 969-972: Update append_fanin_or_fail and its producer-validation
logic in
src/a2a3/runtime/host_build_graph/runtime/orchestrator_core/pto_orchestrator.cpp
lines 969-972, and apply the same change in
src/a5/runtime/host_build_graph/runtime/orchestrator_core/pto_orchestrator.cpp
lines 969-972: reject any nonzero prod_ring by reporting PTO2_ERROR_INVALID_ARGS
and returning false before mark_seen performs fanin lookup or appends the
producer. Keep negative prod_slot validation unchanged.
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📒 Files selected for processing (26)
src/a2a3/runtime/host_build_graph/aicpu/aicpu_executor.cppsrc/a2a3/runtime/host_build_graph/host/runtime_maker.cppsrc/a2a3/runtime/host_build_graph/runtime/orchestrator_core/pto_orchestrator.cppsrc/a2a3/runtime/host_build_graph/runtime/pto_orchestrator.hsrc/a2a3/runtime/host_build_graph/runtime/pto_ring_buffer.hsrc/a2a3/runtime/host_build_graph/runtime/pto_runtime2.hsrc/a2a3/runtime/host_build_graph/runtime/pto_runtime2_types.hsrc/a2a3/runtime/host_build_graph/runtime/pto_shared_memory.hsrc/a2a3/runtime/host_build_graph/runtime/scheduler/scheduler_cold_path.cppsrc/a2a3/runtime/host_build_graph/runtime/shared/pto_runtime2_init.cppsrc/a2a3/runtime/host_build_graph/runtime/shared/pto_shared_memory.cppsrc/a5/runtime/host_build_graph/aicpu/aicpu_executor.cppsrc/a5/runtime/host_build_graph/host/runtime_maker.cppsrc/a5/runtime/host_build_graph/runtime/orchestrator_core/pto_orchestrator.cppsrc/a5/runtime/host_build_graph/runtime/pto_orchestrator.hsrc/a5/runtime/host_build_graph/runtime/pto_ring_buffer.hsrc/a5/runtime/host_build_graph/runtime/pto_runtime2.hsrc/a5/runtime/host_build_graph/runtime/pto_runtime2_types.hsrc/a5/runtime/host_build_graph/runtime/pto_shared_memory.hsrc/a5/runtime/host_build_graph/runtime/scheduler/scheduler_cold_path.cppsrc/a5/runtime/host_build_graph/runtime/shared/pto_runtime2_init.cppsrc/a5/runtime/host_build_graph/runtime/shared/pto_shared_memory.cpptests/ut/cpp/a2a3/test_hbg_submit_poison.cpptests/ut/cpp/a5/test_hbg_submit_poison.cpptests/ut/cpp/common/test_hbg_graph_submit_failure.cpptests/ut/cpp/common/test_hbg_slot_claim.cpp
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Rebased onto @coderabbitai your inline finding is answered on the thread — the mechanism is real but pre-existing (the old guard Note on the hardware checkbox in the description: |
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Tip For best results, initiate chat on the files or code changes. 🧩 Analysis chain🏁 Script executed: #!/bin/bash
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echo '== CodeRabbit review comments on PR `#1965` =='
gh api --paginate \
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echo '== Changed prod_ring contexts =='
rg -n -C 12 '\bprod_ring\b|PTO2_MAX_RING_DEPTH|debug_assert' \
src/a2a3/runtime/host_build_graph \
src/a5/runtime/host_build_graph \
|| true
echo '== Focused diff for orchestrator sources =='
git diff --unified=35 HEAD^ HEAD -- \
src/a2a3/runtime/host_build_graph/runtime/orchestrator_core/pto_orchestrator.cpp \
src/a5/runtime/host_build_graph/runtime/orchestrator_core/pto_orchestrator.cppLength of output: 224275
Both runtime variants now state the single-ring invariant with I withdraw the inline finding. The reported mechanism is pre-existing and this PR does not introduce a regression. ✏️ Learnings added
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Rebased onto #1963 also lands the follow-up noted at the bottom of this description — Re-verified on the rebased tree: 117/117 C++ UTs, full |
host_build_graph has one ring — `PTO2_MAX_RING_DEPTH` was 1 against tmr's 4 — yet the tree carried tmr's multi-ring shape throughout: 38 `[PTO2_MAX_RING_DEPTH]` array declarations, 21 loops that ran exactly once, and callers that then indexed `[0]` anyway. Every shared-memory operation existed twice, as a scalar wrapper that filled a one-element array and a `_per_ring` implementation that read `task_window_sizes[0]` — one of which did not read the array at all and cast it to void. The macro is gone and each operation has one scalar form: `calculate_size`, `init`, `init_header`, `setup_pointers`, `attach_populated`, `runtime_reserve_layout`, `runtime_init_data_from_layout`. `PTO2RuntimeArenaLayout` carries `task_window_size` / `heap_size`, and `sum_ring_heap_sizes` — which summed one element and checked it for overflow against itself — is deleted. `PTO2RingSet` was a struct with one member, `PTO2TaskAllocator task_allocator`, whose own comment claimed "PTO2_MAX_RING_DEPTH instances exist, one per scope depth". The allocator now sits on the orchestrator directly. The `PTO2_RING_TASK_WINDOW` / `PTO2_RING_HEAP` knobs are unchanged in what they accept: the multi-ring parser required exactly one comma-separated value here, so it took a bare number and rejected a list, which is what the scalar parser does. The RuntimeEnv ABI keeps its RUNTIME_ENV_RING_COUNT slots — it is shared with tmr — and this runtime still reads slot 0; the static_assert now says that rather than comparing against a ring depth this runtime no longer has. `PTO2_DEP_POOL_SPIN_LIMIT` is deleted: hbg has no dependency spill pool, and nothing referenced it. Two struct summaries in ring_buffer.h's file comment described `FaninPool` and `DepListPool`, which that file has not held since the pools were removed. The `[STALL]` stall-dump grammar is unchanged. Its per-ring loop is unwrapped with the `ring=` field kept and its value written as the 0 it always was, so existing triage greps still match. tensormap_and_ringbuffer is untouched: it really has four rings. `PTO2FaninBuilder::mark_seen`'s ring guard reads `prod_ring != 0` rather than `prod_ring >= PTO2_MAX_RING_DEPTH`, which is the same test for a `uint8_t` when that macro is 1. It is a dedup predicate, so a producer it cannot place is reported as not-yet-seen and appended by the caller rather than refused; a debug_assert now states the one-ring invariant that makes the distinction moot, and the comment no longer implies a rejection the code does not perform.
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Rebased onto Re-verified: 117/117 C++ UTs, full |
`PTO2_MAX_RING_DEPTH` becomes `CHIP_MAX_RING_DEPTH` — not `MAX_RING_DEPTH`, because that name is taken by a constant this one is deliberately equal to but distinct from: `src/common/hierarchical/types.h` defines the host orchestrator's `MAX_RING_DEPTH = 4` heap-slab count, which `python/bindings/worker_bind.h` exports to Python. `docs/orchestrator.md` states the relationship outright — the host slab count "matches L2's `PTO2_MAX_RING_DEPTH`" — so collapsing the two spellings into one would have turned a documented coincidence into an apparent identity. `.claude/rules/codestyle.md` rule 13 assigns the bare name to the L3+ context and the `Chip` prefix to the chip runtime, the same split this branch already applied to `ChipTaskSlotState`. 484 occurrences across 55 files. After hw-native-sys#1965 the macro is defined only in the two `tensormap_and_ringbuffer/runtime/runtime_types.h` copies — host_build_graph carries no ring dimension at all — so this is now a single-runtime constant. `PTO2_SCOPE_STATS_MAX_RING_DEPTH` in `src/common/platform/include/common/scope_stats.h` is untouched: it is a separate identifier that bounds the scope-stats collector's own per-ring arrays. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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Summary
host_build_graphhas one ring —PTO2_MAX_RING_DEPTHwas1againsttensormap_and_ringbuffer's4— yet the tree carried tmr's multi-ring shape throughout: 38[PTO2_MAX_RING_DEPTH]array declarations and 21 loops that ran exactly once, with callers then indexing[0]anyway.Every shared-memory operation existed twice: a scalar wrapper that filled a one-element array, and a
_per_ringimplementation that readtask_window_sizes[0]. One of them (setup_pointers_per_ring) did not read the array at all — it cast it tovoid.calculate_size,init,init_header,setup_pointers,attach_populated,runtime_reserve_layout,runtime_init_data_from_layout.PTO2RuntimeArenaLayoutcarriestask_window_size/heap_sizeinstead of one-element arrays (same 8 bytes each, so the uploaded header's size is unchanged).sum_ring_heap_sizes— which summed one element and checked it for overflow against itself — is deleted, along with the two open-coded copies of the same loop inruntime_maker.cpp.PTO2RingSetwas a struct with a single member,PTO2TaskAllocator task_allocator, whose own doc comment claimed "PTO2_MAX_RING_DEPTH instances exist, one per scope depth". The allocator now sits on the orchestrator directly.PTO2_DEP_POOL_SPIN_LIMITis deleted: hbg has no dependency spill pool and nothing referenced it. Two struct summaries inpto_ring_buffer.h's file comment describedFaninPoolandDepListPool, which that file has not held since the pools were removed.What deliberately did not change
PTO2_RING_TASK_WINDOW/PTO2_RING_HEAPknobs accept exactly what they did before. The multi-ring parser required exactly one comma-separated value here, so it took a bare number and rejected a list — which is what the scalar parser does.RuntimeEnvABI keeps itsRUNTIME_ENV_RING_COUNTslots (it is shared with tmr) and this runtime still reads slot 0. Thestatic_assertnow states that, rather than comparing against a ring depth this runtime no longer has.bind_callable_to_runtime_impl'sextern "C"signature is untouched — it is a cross-runtime contract.[STALL]diagnostic grammar is byte-identical. Its per-ring loop is unwrapped with thering=field kept and its value written as the0it always was, so existing triage greps still match.tensormap_and_ringbufferis untouched — it really has four rings.Net −419 lines across 26 files.
Testing
examples tests/stona2a3simanda5sim, both runtimes greenclang-formatcleanst-onboard-a2a3/st-onboard-a5jobs.Why the hardware claim is deferred to CI
An
a2a3onboard sweep of this branch on my dev box producedfinalize_native_run failed with code -100(behind507018 ACL_ERROR_RT_AICPU_EXCEPTION, errcode 21008) on a varying set of cases: 8 failures on one run, 1 on the next, 0 on a third. Every failing case passes when run alone. One sweep at the merge base produced 0 failures.That looked like a signal against this branch, so I dug further, and found the comparison was not controlled: other concurrent sessions on that shared box were running their own onboard sweeps against other worktrees during these runs, so the background device load differed between the baseline run and the branch runs. The failure count also fell as the box quietened, which fits contention rather than a defect in the diff.
I am not claiming this is unrelated — I could not establish either way locally, and the same signature family is already recorded on that box for
run_stream_reuse(which does reproduce at the merge base). CI's self-hosted runners are isolated, so their onboard result is the real gate here. Ifst-onboard-a2a3orst-onboard-a5reddens, treat it as this PR's problem and I will bisect against the merge base on a quiet box.Follow-up from the same audit, deliberately not in this PR: hbg reports
PTO2_ERROR_DEP_POOL_OVERFLOWwhen a task's fanin region is exhausted, in a runtime that has no dependency spill pool. That status code is externally visible and sits in the band #1960 just reorganised, so renaming it needs its own coordinated change.