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📝 WalkthroughWalkthroughThe host-build-graph runtime removes per-scope task tracking, scope-end cleanup, and related profiling fields. Scope state retains nesting depth and manual dependency mode. Task completion, initialization limits, output lifetimes, error-code comments, and runtime documentation now reflect graph-resident execution. ChangesHost-build-graph scope lifecycle
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🔵 Low · up to The refactor removes HBG scope-task storage and scope-end processing, but one documentation section still refers to those obsolete mechanisms. This has no runtime impact and is mergeable with explicit owner follow-up to correct the documentation. Poem
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In `@docs/manual-scope.md`:
- Around line 99-103: Update the scope_end documentation to remove the obsolete
host_build_graph scope_tasks and on_scope_end references; limit the lifecycle
description to tensormap_and_ringbuffer, or explicitly state that HBG has
neither a scope-task list nor a scope-end hook.
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docs/manual-scope.mddocs/troubleshooting/device-error-codes/untested.mdsrc/a2a3/runtime/host_build_graph/common/runtime_status.hsrc/a2a3/runtime/host_build_graph/docs/RUNTIME_LOGIC.mdsrc/a2a3/runtime/host_build_graph/host/runtime_maker.cppsrc/a2a3/runtime/host_build_graph/runtime/orchestrator.hsrc/a2a3/runtime/host_build_graph/runtime/orchestrator_core/orchestrator.cppsrc/a2a3/runtime/host_build_graph/runtime/runtime_core.hsrc/a2a3/runtime/host_build_graph/runtime/runtime_types.hsrc/a2a3/runtime/host_build_graph/runtime/scheduler/scheduler.hsrc/a2a3/runtime/host_build_graph/runtime/scheduler/scheduler_cold_path.cppsrc/a2a3/runtime/host_build_graph/runtime/shared/runtime_init.cppsrc/a2a3/runtime/host_build_graph/runtime/types.hsrc/a5/runtime/host_build_graph/common/runtime_status.hsrc/a5/runtime/host_build_graph/docs/RUNTIME_LOGIC.mdsrc/a5/runtime/host_build_graph/host/runtime_maker.cppsrc/a5/runtime/host_build_graph/runtime/orchestrator.hsrc/a5/runtime/host_build_graph/runtime/orchestrator_core/orchestrator.cppsrc/a5/runtime/host_build_graph/runtime/runtime_core.hsrc/a5/runtime/host_build_graph/runtime/runtime_types.hsrc/a5/runtime/host_build_graph/runtime/scheduler/scheduler.hsrc/a5/runtime/host_build_graph/runtime/scheduler/scheduler_cold_path.cppsrc/a5/runtime/host_build_graph/runtime/shared/runtime_init.cppsrc/a5/runtime/host_build_graph/runtime/types.h
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- src/a2a3/runtime/host_build_graph/runtime/scheduler/scheduler.h
- src/a5/runtime/host_build_graph/runtime/scheduler/scheduler.h
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An hbg scope no longer bounds any lifetime. The scheduler's `on_scope_end` was an empty stub, the ring is whole-graph-resident so no task slot and no heap byte is reclaimed before the run ends, and `MAX_RING_DEPTH` is 1 so scope depth selects nothing. What a scope still decides is whether a submit takes its fanin from TensorMap discovery or from `CoreTaskArgs::set_dependencies`, plus the `submit_task` precondition that one be open — and both of those need only the depth. So `scope_stack_top` and `manual_begin_depth` stay and everything built to feed `on_scope_end` goes: - `scope_tasks` and `scope_begins`, their size/capacity fields, and `scope_stack_capacity`, whose only remaining use was an assert bound that `MAX_SCOPE_DEPTH` states directly. `OrchestratorState::init` stops allocating 131,072 + 256 bytes per orchestrator. - `scope_tasks_push`, called on every `prepare_task` and every `graph_submit_outer`: one bounds check and one store per submitted task, for a buffer whose only consumer was the stub. - `on_scope_end` itself, and the `end_scope` arithmetic that computed the range to hand it. - `SCOPE_TASKS_CAP`. Its other user, the boot-time `total_tasks_` garbage filter in `scheduler_cold_path.cpp`, now bounds against `TASK_WINDOW_SIZE` — the same value at `MAX_RING_DEPTH == 1`, and the honest name for "a ring cannot hold more than its task window". - `scope_end_cycle` and the `[ORCH_PROFILING]` `scope_end` row that reported it. `scope_end_atomic_count` goes with them; nothing ever incremented it. `SIMPLER_ERROR_SCOPE_TASKS_OVERFLOW` keeps its number and its name. Nothing in hbg raises it now, but `error_names.h` is shared with `tensormap_and_ringbuffer`, which still does, and `test_error_code_names.cpp` requires the tables to stay complete. `untested.md` records that hbg has no raise site rather than leaving the reader with tmr's multi-ring argument. The comments and docs that described the old scope-refcount model move to what the code does now: - `rt_scope_begin` / `rt_scope_end` state the submit precondition, the MANUAL bypass, and that nothing is reclaimed mid-run, instead of promising a scope-bounded task lifetime and a refcount that releases buffers. - `TaskOutputTensors`'s LIFETIME contract binds to the orchestration pass rather than the enclosing scope, and names its real backing storage: the region `TaskPayload::tensors` points at, or the `GraphRecording` node's tensors inside a Graph body. The old text named an inline payload array in a reusable ring slot, and neither is still true. The rule it gives callers is unchanged in strength. - `TaskState` documents the transition it has, `PENDING -> COMPLETED`, and marks that state terminal. Nothing stores `TASK_CONSUMED`: no slot is recycled before the run ends, and consumer retirement is observed through the per-ring `completed_watermark`. - The hidden-alloc note in `alloc_tensors` says why the generic slot initialization is required — a consumer reads the slot's `task_attrs` and completion mirror — instead of crediting a `scope_end` release and a CONSUMED flip that hbg never performs. - `docs/manual-scope.md` keeps `manual_begin_depth` as the only manual-scope-specific state, and makes the scope task list a runtime-specific thing rather than a shared one: tmr keeps it so `scope_end` can release each producer reference, hbg keeps neither the list nor a scope-end hook. a2a3's `types.h` also moves to `#pragma once` per codestyle rule 12: its `#ifndef` guard named `TENSORMAP_AND_RINGBUFFER`, a runtime the file does not belong to, and no source referenced the macro. Its a5 sibling already used `#pragma once`, so the two files are now identical. Both architecture trees move together.
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Tip For best results, initiate chat on the files or code changes. 🧩 Analysis chain🏁 Script executed: #!/bin/bash
set -euo pipefail
printf '%s\n' '== Candidate files =='
fd -a -t f '^(manual-scope\.md|runtime_types\.h|scheduler_cold_path\.cpp)$' . | sort
printf '%s\n' '== File outlines =='
ast-grep outline docs/manual-scope.md 2>/dev/null || true
ast-grep outline src/a2a3/runtime/host_build_graph/runtime/runtime_types.h --items all 2>/dev/null || true
ast-grep outline src/a5/runtime/host_build_graph/runtime/runtime_types.h --items all 2>/dev/null || true
ast-grep outline src/a2a3/runtime/host_build_graph/runtime/scheduler/scheduler_cold_path.cpp --items all 2>/dev/null || true
ast-grep outline src/a5/runtime/host_build_graph/runtime/scheduler/scheduler_cold_path.cpp --items all 2>/dev/null || true
printf '%s\n' '== Manual-scope scope-end references =='
rg -n -i -C 3 'on_scope_end|scope_tasks|host_build_graph|scope end' docs/manual-scope.md || true
printf '%s\n' '== Removed macro references in HBG trees =='
rg -n -C 2 '\bPTO2_SCOPE_TASKS_CAP\b' src/a2a3/runtime/host_build_graph src/a5/runtime/host_build_graph || true
printf '%s\n' '== Scheduler task-count checks and comments =='
rg -n -C 8 'TASK_WINDOW_SIZE|task_count|int64|ring|sum' \
src/a2a3/runtime/host_build_graph/runtime/scheduler/scheduler_cold_path.cpp \
src/a5/runtime/host_build_graph/runtime/scheduler/scheduler_cold_path.cpp || true
printf '%s\n' '== Relevant current diff =='
git diff --check
git diff -- \
docs/manual-scope.md \
src/a2a3/runtime/host_build_graph/runtime/runtime_types.h \
src/a5/runtime/host_build_graph/runtime/runtime_types.h \
src/a2a3/runtime/host_build_graph/runtime/scheduler/scheduler_cold_path.cpp \
src/a5/runtime/host_build_graph/runtime/scheduler/scheduler_cold_path.cppLength of output: 159102
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Summary
An hbg scope no longer bounds any lifetime, so this reduces it to the one thing it still decides — depth — and deletes the machinery built to feed a stub.
SchedulerState::on_scope_endwas an empty function. The ring is whole-graph-resident, so no task slot and no heap byte is reclaimed before the run ends, andMAX_RING_DEPTHis 1, so scope depth selects nothing. What a scope still decides is whether a submit takes its fanin from TensorMap discovery or fromCoreTaskArgs::set_dependencies, plus thesubmit_taskprecondition that one be open — and both need onlyscope_stack_topandmanual_begin_depth. Everything else goes:scope_tasks/scope_begins, their size and capacity fields, andscope_stack_capacity, whose only remaining use was an assert boundMAX_SCOPE_DEPTHstates directly.OrchestratorState::initstops allocating 131,072 + 256 bytes per orchestrator.scope_tasks_push, called from everyprepare_taskand everygraph_submit_outer: one bounds check and one store per submitted task, for a buffer whose only consumer was the stub.on_scope_enditself, and theend_scopearithmetic that computed the range to hand it.SCOPE_TASKS_CAP. Its other user, the boot-timetotal_tasks_garbage filter inscheduler_cold_path.cpp, now bounds againstTASK_WINDOW_SIZE— the same value atMAX_RING_DEPTH == 1, and the honest name for "a ring cannot hold more than its task window".scope_end_cycleand the[ORCH_PROFILING]scope_endrow that reported it.scope_end_atomic_countgoes with them; nothing ever incremented it.SIMPLER_ERROR_SCOPE_TASKS_OVERFLOWkeeps its number and its name: nothing in hbg raises it now, buterror_names.his shared withtensormap_and_ringbuffer, which still does, andtest_error_code_names.cpprequires the tables to stay complete.untested.mdrecords that hbg has no raise site rather than leaving the reader with tmr's multi-ring argument.Comments and docs that described the old model
These were asserting a scope-refcount design the runtime does not have, which is the kind of documentation that misleads for years because it reads as authoritative:
rt_scope_begin/rt_scope_endstate the submit precondition, the MANUAL bypass, and that nothing is reclaimed mid-run, instead of promising a scope-bounded task lifetime and a refcount that releases buffers.TaskOutputTensors's LIFETIME contract binds to the orchestration pass rather than the enclosing scope, and names its real backing storage: the regionTaskPayload::tensorspoints at, or theGraphRecordingnode's tensors inside a Graph body. The old text named an inline payload array in a reusable ring slot; neither is still true. The rule it gives callers is unchanged in strength — only its stated mechanism was wrong.TaskStatedocuments the transition it has,PENDING -> COMPLETED, and marks that state terminal. Nothing storesTASK_CONSUMED: no slot is recycled before the run ends, and consumer retirement is observed through the per-ringcompleted_watermark.alloc_tensorssays why the generic slot initialization is required — a consumer reads the slot'stask_attrsand completion mirror — instead of crediting ascope_endrelease and a CONSUMED flip that hbg never performs.docs/manual-scope.mdkeepsmanual_begin_depthas the only manual-scope-specific state and marks the scope task list as generic bookkeeping whosescope_endconsumer differs per runtime: live intensormap_and_ringbuffer, absent inhost_build_graph.a2a3's
types.halso moves to#pragma oncepercodestyle.md§12: its#ifndefguard was spelledSRC_A2A3_RUNTIME_TENSORMAP_AND_RINGBUFFER_RUNTIME_PTO_TYPES_H_, naming a runtime the file does not belong to, and no source referenced the macro. Its a5 sibling already used#pragma once, so the two files are now identical.Both architecture trees move together.
Testing
clang-format --dry-run -Werrorclean on all 20 changed C++ files;markdownlint-cli2clean on all 4 changed docs-fsyntax-onlywith-DSIMPLER_DFX=1 -DSIMPLER_ORCH_PROFILING=1onorchestrator.cppandruntime_maker.cpp, both arches — the profiling struct change is invisible to a default build, so it needs its own checkpytest tests/ut -m "not requires_hardware"— 1886 passed, 7 skippedctest --test-dir tests/ut/cpp/build -LE requires_hardware— 117/117pytest examples tests/st --platform a2a3sim --device 0-15and--platform a5sim, both 0 failurespytest examples tests/st -m "not sdma" --platform a2a3 --exclude-level 4and the separate-m sdmaarmonboard-arch-precheckrefuses); covered by a5simOn the async-endpoint / FIFO scene tests
Across eight full a2a3 onboard runs on a shared box, four different cases failed at least once, never the same set twice, all as
507018/sched_error_code=100 SCHEDULER_TIMEOUTorRunHandle.wait() timed out. An unmodified base at this PR's merge-base reproduces it — that control run failedworker_async_fifo::TestWorkerAsyncWholeRunFifoTmr::test_run. Two of the affected cases areruntime="tensormap_and_ringbuffer", which this hbg-only diff cannot reach. These tests park a run at a SubTask fence and poll from Python with wall-clock deadlines, and the failing runs pin a singlechip.runat ~46.05 s (the ~45 s op-execute timeout), so they are load-sensitive by construction; failures clustered while 12/16 devices were held by other users.worker_async_endpointpasses 6/6 standalone on both the branch and the base. Flagging rather than filing, since it wants a maintainer's read on whether to quarantine or raise the deadlines.