Add: carry a run's Graph Definition in the AICPU launch arguments - #2487
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Navigate logical layers of code changes, visualize relationships, and explore their blast radius. 📝 WalkthroughWalkthroughGraph Definitions now travel through launch-package sections on onboard runs and host snapshots in simulation. AICPU graph execution reads Definition data from bounded image views and stores fanin data in execution-owned storage. Bind-phase reporting names the packing stage graph_pack. ChangesGraph Definition section flow
Estimated code review effort: 4 (Complex) | ~45 minutes Change: Refactor Sequence Diagram(s)sequenceDiagram
participant RuntimeMaker
participant HostApi
participant DeviceRunnerBase
participant KernelArgsHelper
participant AICPUThread
RuntimeMaker->>HostApi: acquire staging and publish Graph Definition section
HostApi->>DeviceRunnerBase: stage and publish section
DeviceRunnerBase->>KernelArgsHelper: stage launch-envelope bytes
KernelArgsHelper->>AICPUThread: provide launch arguments with section metadata
🚥 Pre-merge checks | ✅ 4✅ Passed checks (4 passed)
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Actionable comments posted: 3
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @docs/dfx/hbg-bind-phases.md:
- Around line 297-298: Update the comparison guidance and reference section
around graph_pack to distinguish the historical graph_upload measurements from
the current graph_pack scope. Keep graph_upload as the historical marker name,
and describe graph_pack as packing without its own H2D copy; remove descriptions
that characterize current graph_pack as publication-copy-only.
Review comments at @src/common/host_build_graph/graph_execution.h:
- Around line 412-413: Update the layout comment above
GraphExecutionStorageLayout to include the fanin offsets and indices regions and
the trailing ChipTaskState array in the order used by
graph_execution_storage_layout. Replace the stale claim that there is no fanin
region with an accurate description of the copied fanin CSR and sub-task payload
behavior, and update the corresponding stale layout description in
GRAPH_EXECUTION.md.
Review comments at
@tests/ut/cpp/common/host_build_graph/test_hbg_bind_ledger.cpp:
- Around line 2072-2090: Update AnOrdinaryRunAfterAGraphRunNamesNoSection to
register a valid callable table on the runtime before the ordinary bind, so the
resident scheduler can resolve the task’s kernel address. Add a cleanup_runtime
guard and ensure the second bind’s state is released or covered by that cleanup
before the test exits.
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📒 Files selected for processing (58)
docs/dfx/hbg-bind-phases.mddocs/dfx/host-trace.mdsimpler_setup/tools/hbg/bind_phases.pysimpler_setup/tools/strace_timing.pysrc/a2a3/platform/include/common/kernel_args.hsrc/a2a3/platform/onboard/aicpu/kernel.cppsrc/a2a3/platform/sim/host/device_runner.cppsrc/a2a3/runtime/host_build_graph/aicpu/aicpu_executor.cppsrc/a2a3/runtime/host_build_graph/docs/profiling_levels.mdsrc/a2a3/runtime/host_build_graph/host/runtime_maker.cppsrc/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/scheduler/scheduler_context.hsrc/a2a3/runtime/host_build_graph/runtime/scheduler/scheduler_dispatch.cppsrc/a2a3/runtime/tensormap_and_ringbuffer/runtime/runtime.hsrc/a2a3/runtime/tensormap_and_ringbuffer/runtime/shared/runtime.cppsrc/a5/platform/include/common/kernel_args.hsrc/a5/platform/onboard/aicpu/kernel.cppsrc/a5/platform/sim/host/device_runner.cppsrc/a5/runtime/host_build_graph/aicpu/aicpu_legacy_executor.cppsrc/a5/runtime/host_build_graph/docs/profiling_levels.mdsrc/a5/runtime/host_build_graph/host/runtime_maker.cppsrc/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/scheduler/scheduler_context.hsrc/a5/runtime/host_build_graph/runtime/scheduler/scheduler_dispatch.cppsrc/a5/runtime/tensormap_and_ringbuffer/runtime/runtime.hsrc/a5/runtime/tensormap_and_ringbuffer/runtime/shared/runtime.cppsrc/common/host_build_graph/device/graph_execution.cppsrc/common/host_build_graph/device/graph_image_source.hsrc/common/host_build_graph/docs/GRAPH_EXECUTION.mdsrc/common/host_build_graph/graph_execution.hsrc/common/host_build_graph/graph_image_view.hsrc/common/host_build_graph/host/orchestrator.cppsrc/common/host_build_graph/runtime.hsrc/common/host_build_graph/runtime_types.hsrc/common/host_build_graph/shared/runtime.cppsrc/common/platform/include/aicpu/platform_entry_args.hsrc/common/platform/include/common/chip_swimlane_profiling.hsrc/common/platform/include/common/host_api.hsrc/common/platform/include/common/host_phase_kind.hsrc/common/platform/include/common/launch_entry_args.hsrc/common/platform/onboard/host/c_api_shared.cppsrc/common/platform/onboard/host/device_runner_base.cppsrc/common/platform/onboard/host/device_runner_base.hsrc/common/platform/onboard/host/device_runner_helpers.cppsrc/common/platform/onboard/host/device_runner_helpers.hsrc/common/platform/sim/host/c_api_shared.cppsrc/common/platform/sim/host/device_runner_base.cppsrc/common/platform/sim/host/device_runner_base.htests/ut/cpp/a2a3/runtime/host_build_graph/test_graph_activation.cpptests/ut/cpp/a5/runtime/host_build_graph/test_graph_activation.cpptests/ut/cpp/common/host_build_graph/test_hbg_bind_ledger.cpptests/ut/cpp/common/host_build_graph/test_hbg_graph_cache.cpptests/ut/cpp/common/host_build_graph/test_hbg_stall_dump_level.cpptests/ut/cpp/common/platform/test_launch_entry_args.cpptests/ut/py/hbg/test_bind_phases_grouping.pytests/ut/py/test_phase_time_split.py
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host_build_graph built its Graph Definitions on the host, then gave them a device home of their own: a per-slot block the runtime allocated, uploaded with its own H2D, grew when a wider run needed more, and freed at close. Every Definition of a run was packed into that block and each outer Graph task was bound to an address inside it, so the runtime owned device storage for a description it had already written once. The section now travels as launch arguments. The bind packs every Definition of the run into one section and hands it to the platform, which appends it to the AICPU launch package behind the 192-byte header; `argsSize` covers the whole package, so RTS copies the bytes as part of the launch it already makes. No rtMalloc, no rtMemcpy and no rtFree for a Definition remains, and there is no manual fallback: the block, its grow rule and its release path are deleted. A task no longer names its Definition by address. `TaskDescriptor` carries `graph_definition_offset`, the object's position inside the section, and `graph_context` stays null until the device installs the execution. ## Each reading thread reads its own package The launch package belongs to the thread that entered with it, and the completion gate is a last-one-out latch rather than a barrier, so a thread can return while its peers still materialize. Nothing shared may therefore point into any one thread's arguments: - `GraphExecution` keeps `definition_offset` instead of a `GraphDefinition *`, and every reader resolves it against its own view; - the fanin CSR — the one part of the image read on every dependency scan, producer lookup, wait registration and completion — is copied by value into the execution's own storage tail at localize, so those 24 read sites keep plain typed loads and `execution_storage_bytes` now includes its rows and indices on both ends of the bind; - the boundary argument pools and materialized task storage already had independent ownership and are unchanged. Reads are byte-safe rather than alignment-dependent. `GraphImageView` copies fixed-size values into aligned locals, which is defined for any source address, so no package is refused for its base alignment and no typed pointer is formed into the section. Every access is bounded twice — against the framed Definition and against the whole section — because a corrupt offset can land inside another well-framed object; offset arithmetic is checked before it narrows. The framing gate compares a separately decoded header against a separately decoded Definition instead of dereferencing past a copied header. On a5 the reader is the legacy executor: any `TaskKind::GRAPH` selects `SCHEDULER_RUNTIME_MODE_LEGACY_GRAPH`, so `AicpuExecutor::init` is never entered by a graph run and the view is threaded through the legacy path's classify and dispatch loops. a2a3 uses the same two entries in its own executor. ## Carriers, and what fails where The platform reports which carrier it used, so the bind stays platform-agnostic. Onboard it is the launch package and no address is published, because there is no single one. Simulation calls the device entry in-process with the `Runtime` and has no launch package at all: its runner copies the section into a run-owned host snapshot, publishes that address, and marks the source `HostSnapshot`. A reader accepts only its own platform's source, so neither can decode the other's, and a run with no Graph names no section at all. No size limit is introduced. The only new refusals are a package that cannot be represented in the `uint32_t` the launch boundary takes and a host packing failure, both at bind before any submission. A bind failure precedes every submission; an AICPU launch that fails after the AICore submission was accepted keeps its actual `Partial` grade and is drained, not treated as unstarted; and a section a reading thread rejects ends the run through the existing `fail_scheduler` latch and emergency shutdown, adding no peer barrier. The publication takes the section and the descriptor's length together or neither, decided before the publication writes anything: a run whose descriptor names no section gets none even if a failed prepare left a length staged on its slot, a length that disagrees with the descriptor's fails the publication, and the staged length is consumed whatever this publication then does. DFX says what now happens: the `graph_upload` phase becomes `graph_pack`, is no longer a host-to-device transfer, and its span covers assembling the section and handing it to the launch package. That is the segment's third scope, so the historical measurements keep their own name and the guidance says why a log from either side of a boundary is not comparable — a pre-rename log carries `graph_upload`, which the current parser reports as unknown and leaves out of its total. ## Costs The same bytes still move, from a bind H2D into the launch, so the transfer no longer overlaps a predecessor's execution. RTS holds its own copy of the package for the launch and its physical multiplicity is not established here, so no device-memory reduction is claimed. Each execution's storage grows by `(task_count + 1) x 4 + edge_count x 2` bytes plus layout, inside the outer Graph task's existing heap tail. `KernelArgs` gains three uint32_t on both arches and reaches 144 bytes on each (a2a3 136 -> 144, filling its tail padding; a5 128 -> 144, gaining four bytes of it), so host, AICPU and AICore rebuild together. No latency or throughput gain is claimed. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Problem
host_build_graphbuilds a run's Graph Definitions on the host and then givesthem a device home of their own. The runtime allocates a per-slot block, uploads
every Definition of the run into it with its own H2D, grows the block when a
wider run needs more, and frees it at close; each outer Graph task is bound to an
address inside it. So the runtime owns, grows and releases device storage for a
description it has already written once — and the growth path carries its own
failure rules, which a separate review found diverge from every other retained
region in the tree.
What changes
The Definition section becomes launch arguments. The bind packs every
Definition of the run into one section and hands it to the platform, which
appends it to the AICPU launch package behind the 192-byte header.
argsSizecovers the whole package, so RTS copies the bytes as part of the launch it
already makes. No
rtMalloc,rtMemcpyorrtFreefor a Definition remains,and there is no manual fallback kept anywhere: the block, its grow rule, its
release and its abandon path are deleted.
A task no longer names its Definition by address.
TaskDescriptorcarriesgraph_definition_offset— the object's position inside the section, carved outof the existing pad so the descriptor's size and
packed_buffer_baseoffset areunchanged — and
graph_contextstays null until the device installs theexecution.
Each reading thread reads its own package
A launch package belongs to the thread that entered with it, and the completion
gate is a last-one-out latch rather than a barrier
(
a2a3/.../aicpu_executor.cpp:382-389), so a thread can return while peers arestill materializing. Nothing shared may point into one thread's arguments:
GraphExecution::definitionconst GraphDefinition *into the imageuint32_t definition_offset, resolved per readerfanin_offsets,fanin_indicesboundary_tensors,boundary_scalars, task storageThe fanin CSR is the one part of the image read on every dependency scan,
producer lookup, wait registration and completion — 24 sites across the two
schedulers — so it becomes execution-owned rather than decoded per edge. Those
sites keep plain typed loads;
execution_storage_bytesnow includes its rows andindices, sized where the counts are decided (
orchestrator.cpp) and checkedagainst on both ends of the bind and at device acquisition.
Byte-safe, not alignment-dependent
GraphImageViewcopies fixed-size values into aligned locals, which is definedfor any source address, so no package is refused for its base alignment and
no typed pointer is ever formed into the section. Every read is bounded twice —
against the framed Definition and against the whole section — because a corrupt
offset can land inside another well-framed object, and offset arithmetic is
checked before it narrows. The framing gate compares a separately decoded header
against a separately decoded Definition rather than dereferencing past a copied
header.
The actual a5 reader
Any
TaskKind::GRAPHmakescreate_scheduler_stateselectSCHEDULER_RUNTIME_MODE_LEGACY_GRAPH(a5/.../runtime_maker.cpp:1030-1036), soaicpu_executereturns throughlegacy_aicpu_executeandAicpuExecutor::initis never entered by a graph run. The view is threaded through the legacy path's
classify and dispatch loops; a2a3 uses the same two entries in its own executor.
Both take
platform_aicpu_affinity_thread_idx(), the index the platform entrypublishes each thread's view under.
Carriers and failure
The platform reports which carrier it used, so the bind stays
platform-agnostic:
Simulation calls the device entry in-process with the
Runtimeand has no launchpackage at all, so it gets its own source value rather than a fallback; a reader
accepts only its own platform's source, and a run with no Graph names no section.
No size limit is introduced. The only new refusals are a package that cannot
be represented in the
uint32_tthe launch boundary takes — checked before theaddition that would wrap, and again at that boundary, which had no range check
before — and a host packing failure. Both are at bind, before any submission.
Failure states are the existing ones, per submission point: a bind failure
precedes every submission; an AICPU launch that fails after the AICore
submission was accepted keeps its real
Partialgrade and is drained rather thantreated as unstarted; and a section a reading thread rejects ends the run through
fail_scheduler→emergency_shutdown, with peers breaking out viacheck_latched_sched_errorand no new barrier.The publication takes both halves or neither
The section's length reaches the header from two independent places — the slot's
staging and the run's own descriptor — and
publish_runtime_argsdecides on bothbefore it writes anything:
left a length staged on its slot;
that is this run's own bind disagreeing with itself;
failure path leaves it for the next run on that slot.
DFX and docs
graph_uploadbecomesgraph_pack, stops being a host-to-device transfer, andnow spans assembling the section and handing it to the launch package. The phase
kind, the swimlane label,
strace_timing,hbg/bind_phases, bothprofiling_levels.mdtables,docs/dfx/hbg-bind-phases.md,docs/dfx/host-trace.mdand
GRAPH_EXECUTION.mdare updated together.Costs, stated plainly
no longer overlaps a predecessor's execution.
multiplicity is not established by any source read here, so no device-memory
reduction is claimed and no copy count is promised.
(task_count + 1) × 4 + edge_count × 2bytes plus layout, inside the outer Graph task's existing heap tail.
KernelArgsgains threeuint32_ton both arches and reaches 144 bytes oneach: a2a3 136 → 144, which fills its 4 bytes of tail padding exactly, and
a5 128 → 144, which gains 4 bytes of it. The two do not grow by the same
amount, because the padding they started with differs.
PlatformEntryArgsgains three fields, so host, AICPU and AICore must rebuild together; mixed
layouts are not supported.
promised to submit successfully — RTS allocation or submission failures keep
their actual grade.
Scope
a2a3 and a5
host_build_graphprogram Graph runs, both platforms, plus theshared carrier. TMR is untouched: its entry route is unchanged and the graph
fields stay zero for it. Runs with no Graph task, caller tensor ownership, device
serialization and #2481's submission/completion/retirement invariants are
unchanged — this adds one field to one of the two submissions and changes neither
the order nor the grading rules. No capture wiring, no new behaviour gate, no
PTO_/PTO2identifier.Validation
Nothing was built or run for this head. The instruction for both rounds was
to author and delegate compilation to the head's automatic CI, so the ledger
separates what ran from what is authored:
clang-format --dry-run -Werroron all 49 changed C++ files (clean),ruff check+ruff format --checkon the 4 changed Python files (clean),markdownlint-cli2on the 5 changed docs (0 errors), andcheck_english_only,check_headers,check_kernel_wire_isolation,check_retired_names,check_ut_cpp_case_naming,check_task_id_bitson the changed set (all rc=0)New cases, authored and not executed:
GraphImageSection.DecodesAtAnUnalignedBase— the same section decodesidentically at an odd base; header fields and an element agree.
GraphImageSection.RefusesReadsOutsideTheObjectOrTheSection— zero offset,past-the-image offset, straddling read, element index past its array, a count
the image cannot hold, a truncated section, a reframed
full_keyand a brokenmagic are each refused.
GraphImageSection.ExecutionSurvivesTheLocalizersPackage— the localizingthread's package is destroyed, then the rows read back equal what localize
saw and a peer materializes the whole body through its own copy. This is
the case a borrowed image pointer could not pass.
HbgBindLedgerTest.ARefusedCarrierFailsTheBindAndNamesNoSectionHbgBindLedgerTest.AnOrdinaryRunAfterAGraphRunNamesNoSectionLaunchEntryArgs.AStagedSectionNoDescriptorNamesIsNotPublished— thepublication boundary, built for both runtimes: a section left staged on
the slot while the descriptor names none does not reach the header, the
staged length is consumed rather than inherited, and the payload stays the
plain header. This is the case the graph decoder tests cannot reach, because
by then the header already names a predecessor's bytes.
LaunchEntryArgs.AGraphSectionTravelsOnlyWhenBothSidesNameTheSameLength—the positive half plus the disagreement: the staged bytes really are at
offset 192 of the submitted package, and half that length under the same
descriptor fails the publication and submits nothing.
GraphActivationTest.CompleteTaskTakesTheOrdinaryPathForTheOuterGraphTask(rewritten, both arches) — the shell's context is now its own
GraphExecutionrather than aGraphDefinition, and the case is set upbound and ACTIVE so only the
task_kind == GRAPHhalf of the predicate canroute it.
Existing coverage this PR intentionally invalidates and updates — the old
expectations asserted the Definition H2D that no longer exists:
AllMetadataSourcesSurviveBindAndPublishInOrder(one prerequisite and two copies→ no prerequisite, one copy, plus a
graph_packrecord and the publishedsection), the two prerequisite-count loops and the copy-region count the second
of them drives its failure injection from, the legacy-selection case, the
storage-layout case (now asserts the CSR regions), and the
graph_executionharness (now names the Definition by offset and passes a view).
Second round — what the review found, and what auditing for it then found
Manager review of
6d7b691e9blocked on one deterministic defect and asked forthe base to be refreshed. Both are done, and looking for siblings of the first
defect turned up three more the failed job never reached:
sizeof(KernelArgs)asserted 152 on a2a3; the compiler says 144. The failed pre-commit job's only error, in every a2a3 TU.uint32_tfilling 144 exactly, so its old 4 bytes of tail padding are gone; a5 has thirteen ending at 104 and nineuint32_treaching 140, rounded to 144. Corrected to 144 and addedoffsetof(graph_section_offset)on each arch (132 / 124), whichsizeofcannot substitute for because every member of the tail is the same width. The a5 comment claiming the two sizes differ, and the a2a3 one claiming a lone paddeduint32_t, are corrected rather than left as ABI folklore.test_graph_activation.cppstill assignedexec.definition = &definitionon both arches — a compile error the failing job never reached.definition_offset. The outer-shell case's stated premise ("before localize the shell's context is the shared Definition") is no longer true and was rewritten, not patched.AllMetadataSourcesSurviveBindAndPublishInOrderstill expected 2 copies after a rejected second publication.SchedulerPublicationFailureAllowsFreshModeSelectionstill counted the Definition as a copy region, so its failure-injection loop would have run one iteration past the copies that exist and its ownprerequisites.size() + 1 == regionsself-check would have failed.regionsno longer counts it.Two further stale statements fell out of the same audit and are fixed:
graph_execution_from_outer_slot's comment andGRAPH_EXECUTION.md's bindparagraph both still said the host points
graph_contextat the Definition.One behaviour change came with the new publication test rather than from the
review: the section/descriptor agreement check now runs before the
publication mutates anything, so a refusal leaves no half-formed payload and no
error path can leave a staged length behind for the next run on the slot.
The manager's withdrawal of the earlier provisional stale-tail finding is
accepted —
6d7b691e9already handled the named scenario — and cases 6 and 7above are the focused regression that pins the distinction.
Rebased onto
8aae172e5, which adds #2472 (A5 HBG Mix via SSBUF) and #2484. Therebase was textually clean; the semantic check that mattered is that #2472's new
scheduler_mix.h/scheduler_graph.hread no Definition image and itstest_hbg_bind_ledger.cppedits touch theresident/definitionspredicatesthis PR also edits — composed above — while a5's non-legacy executor still
calls no
classify_partition, which is what keeps the legacy reader correct.Third round — CI is no longer hypothetical
b9b6970dfcleared pre-commit, so CI compiled and ran everything for the firsttime. It found two more defects, both mine, both now fixed:
DeviceRunnerBase::clear_temporary_buffer()had no definition.libhost_runtime.sofailed todlopenwithundefined symbol: _ZN16DeviceRunnerBase22clear_temporary_bufferEv, which is the single cause of every onboard failure in that round —ut-a2a3,ut-a5, all three onboard ST jobs. Deletingrelease_graph_definition_blocksandabandon_graph_definition_blockshad taken the adjacent unrelated function with them, leaving its declaration and its one caller.main's by exactly the intended renames.AnOrdinaryRunAfterAGraphRunNamesNoSectionfailed, the one cpput failure in that round. Its ordinary bind selects a5's AICore scheduler, which resolves each task's callable at bind, and the case installed no callable tables.Neither was reachable by inspection alone from the previous head, because
pre-commit stops before the link and before cpput.
Where
15d0243bastandspre-commit,build,packaging-matrix(×2),profiling-flags-smokeut(×2),ut-a2a3,ut-a5st-sim-a2a3(×2),st-sim-a5(×2)st-onboard-a5,st-network1-onboard-a2a3,st-deepseek-onboard-a2a3st-onboard-a2a3The one red lane, and what I can and cannot show
The 18 failures are one signature cluster: 15 ×
chip run lane is poisoned: finalize_native_run failed with code -100and 14 ×comm_init failed, spreadover devices 1–7 and spanning both runtimes — 5 collectives cases, 2
comm_domain, 2 L3 examples, 3 TMR, 2runtime_fatal_codestimeouts, and 4a2a3 HBG cases.
What I can show:
tests/st/worker/collectives/*andcomm_domain/*are arch-agnostic andthe same cases, including
TestAllreduceOnephaseP2MaxMinProd, pass onst-onboard-a5at this exact head (127 selected, 0 failed). My diff'sshared surface — the
KernelArgsgrowth and the publication helper — isidentical on both lanes, so a defect there would have to fail both.
early_enqueue::TestThreeRunCapacity::test_three_runs_are_launched_and_accepted_at_oncealso fails on a sibling PR's concurrent run on the same machine
(
codex/vllm-step2-closeout, run36659694194, started five minutes beforemine), where it is equally unrelated to that PR's change.
What I cannot show: a reproduction. This round's constraint is no local build or
install, so I cannot run these cases against this head and its merge base. I am
therefore not calling them unrelated — the cluster is consistent with the
machine and inconsistent with the diff, and that is short of proof. A rerun of
this lane is the next measurement, and it is the manager's to schedule under the
max-2-per-family policy, not mine to POST.
Fourth round — review findings, no behaviour change
Three unresolved review threads and two manager findings, all documentation or
test evidence. No product behaviour, ABI or semantics moved; the diff is five
files, +121 / −68 over
15d0243ba.The DFX segment has held three scopes, and I had flattened them. Renaming
graph_uploadtograph_packeverywhere also renamed passages that recordmeasurements taken under the old name and the old scope:
graph_uploadgraph_uploadgraph_packThe historical name is restored in the branch-comparison guidance, the reference
table's scope note, the
777d4171row, the†footnote and the interleavinganecdote; current-scope text stays
graph_pack. One consequence the review didnot raise and the doc now states: a pre-rename log carries
graph_upload, whichthe current parser reports as an unknown segment and leaves out of its total,
so an old total is short by that segment's time rather than merely scoped
differently. The trap-table row and
bind_phases.py's docstring andCONTROL_PLANEcomment claimed the subtotal "excludes Definition preparation" —it no longer does; what it still excludes is Graph task binding, compact
execution-image preparation and A5 scheduler work.
The heap-tail layout comment was stale in two files.
graph_execution.handGRAPH_EXECUTION.mdboth still drew the tail without the fanin regions — andwithout the trailing state array either — and both still said "There is no fanin
region". That sentence was true of the sub-task payload, which still carries
none and still keeps
fanin_count0, so it is corrected rather than deleted: thedependencies now come from the execution's own by-value copy of the CSR.
The CSR-lifetime case no longer rests on allocator reuse. The manager was
right that freeing the localizer's package and allocating a same-shaped vector
proves nothing — an ordinary allocator need not reuse the address, and I had
leaned on a sanitizer lane I never confirmed runs.
ExecutionSurvivesTheLocalizersPackageis now deterministic and makes two independent claims:
fanin_offsetsandfanin_indiceslie inside[heap.base(), heap.end())and are provably disjoint from the localizer package's byterange. Ownership is asserted, not inferred.
memsetto0x7Ewhile it isstill a live object, then every row and index is compared against what
localize read. A borrowed pointer would read the poison, and reading it is
defined behaviour — unlike reading a freed allocation, where the read itself
is what is undefined. The peer then materializes the whole body through its
own copy, which the poisoned package could no longer serve.
Unresolved limits
st-onboard-a2a3is red and I have not root-caused it. The earliestfailure in the log is three-run capacity retirement on device 7 (
-100),followed by TMR
507018/sched_error_code=100andcomm_init/ reset507033; devices 5 and 7 both appear, so the historically-excluded device 5does not account for it and I am not calling it flaky. What I established in
round three still stands and is still short of proof — see above. This PR's
merge base predates CI: partition the a2a3 scene corpus and isolate the SDMA fault case #2485, which partitions the a2a3 corpus and isolates the
SDMA fault case, but this failure is in the earlier ordinary sweep, so a
rebase is not a demonstrated repair and I have not performed one. Rebasing
onto
02f1b1f6cto measure that lane under the current corpus split is aone-command follow-up whenever the manager wants it; I am not requesting a
rerun.
compiler, one by CI's linker, one by cpput, three by reading. Reading found
the ones it found only after CI pointed at the first of their kind, which is
a fair estimate of how much confidence to place in the unexecuted parts.
KernelArgsnow carries 4 bytes of tail padding where it carried none,so appending a tenth
uint32_tto its tail would not movesizeofand noassert here would catch it. a2a3 has no such gap. Stated rather than papered
over with a filler field.
Carry a run's entry arguments into the AICPU launch arguments #2432 measured remain uncharacterised.
statement only.
not a graph consumer and is untouched here.
Base
8aae172e5· head04c88e9dc· 58 files, +1651 / −516.🤖 Generated with Claude Code