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Update: share Graph Definitions across HBG submissions - #1874
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ChaoWao merged 1 commit intoAug 18, 2026
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📝 WalkthroughWalkthroughGraph Definitions are uploaded once into retained device buffers. Submission images now contain invocation data plus definition hashes and addresses. Device localization verifies shared definitions and allocates execution storage only for nodes and patches. Tests and investigation documentation cover the new model. ChangesShared Graph Definition Flow
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟠 High · up to This change shares retained Graph Definitions across submissions, but malformed definitions can currently trigger out-of-bounds reads and potentially leave executions stuck. Merge should be blocked until the retained-object length is validated before hashing and the oversized-length case is covered by a regression test. Sequence Diagram(s)sequenceDiagram
participant PTOOrchestrator
participant RuntimeMaker
participant HostApi
participant DeviceRunnerBase
participant GraphExecution
PTOOrchestrator->>RuntimeMaker: enumerate definitions and build hash-based submissions
RuntimeMaker->>HostApi: acquire retained definition buffer
HostApi->>DeviceRunnerBase: allocate or reuse keyed device buffer
DeviceRunnerBase-->>RuntimeMaker: return definition address
RuntimeMaker->>GraphExecution: submit definition address and hash
GraphExecution->>GraphExecution: verify shared definition and localize execution
Poem
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
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Actionable comments posted: 2
🔇 Additional comments (13)
tests/ut/cpp/common/test_hbg_graph_cache.cpp (1)
123-178: LGTM!Also applies to: 258-276, 288-300, 382-394, 525-582
src/a2a3/runtime/host_build_graph/host/runtime_maker.cpp (1)
459-461: 🩺 Stability & Availability
⚠️ Unverified finding
Sandbox verification was unavailable.Verify cleanup after a failed Definition upload.
After
acquire_graph_definition_buffer()succeeds, these paths return oncopy_to_device()failure without releasing or abandoningobject. If the retained-buffer API does not roll back this state internally, a partially copied Definition object can persist and consume retained memory. Confirm the API contract. If it does not clean up, abandon the object before returning and add failure-path coverage.Based on learnings, maintain byte-for-byte parity between
src/a5/runtime/host_build_graph/andsrc/a2a3/runtime/host_build_graph/; apply the cleanup to both trees.src/common/host_build_graph/graph_execution.h (3)
104-125: LGTM!
158-162: 🗄️ Data Integrity & Integration
⚠️ Unverified finding
Sandbox verification was unavailable.Verify the
definition_addraddress base contract.
GraphDefinitionHeaderdefines the retained object as[GraphDefinitionHeader][GraphDefinition image]. The lookup at Line 272 castsdefinition_addrdirectly toconst GraphDefinition *.If the runtime maker stores the address returned by
acquire_graph_definition_buffer, the lookup reads the header as aGraphDefinitionand rejects the submission. Make the producer store the image address, or make the lookup derive the image address from the header.Also applies to: 269-274
413-452: LGTM!src/common/host_build_graph/graph_host_state.h (1)
15-18: LGTM!Also applies to: 37-52
src/common/platform/include/common/host_api.h (1)
65-74: LGTM!Also applies to: 178-181
src/common/platform/onboard/host/device_runner_base.h (1)
150-151: LGTM!Also applies to: 1086-1091
src/common/platform/onboard/host/c_api_shared.cpp (1)
171-181: LGTM!Also applies to: 297-297
src/common/platform/onboard/host/device_runner_base.cpp (1)
210-267: LGTM!src/common/platform/sim/host/device_runner_base.h (1)
200-200: LGTM!Also applies to: 347-350
src/common/platform/sim/host/c_api_shared.cpp (1)
157-167: LGTM!Also applies to: 284-284
src/common/platform/sim/host/device_runner_base.cpp (1)
413-461: LGTM!
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Inline comments:
In `@docs/investigations/2026-08-hbg-graph-definition-single-upload.md`:
- Around line 50-58: Separate the shared Definition upload from the 40
reference-submission uploads in the discussion around rtMalloc and rtMemcpy, and
remove the unsupported uniform latency calculation based on 12.1 ms divided by
41; docs/investigations/2026-08-hbg-graph-definition-single-upload.md lines
50-58 require this distinction. Update docs/investigations/README.md line 87 to
remove the claim that all 41 calls carry 2.5 KB payloads.
In `@src/common/host_build_graph/graph_execution.cpp`:
- Around line 278-285: Validate the retained Definition object length before
invoking graph_definition_hash_matches: obtain the trusted retained-object
length and require definition->total_bytes to be at least
sizeof(GraphDefinition) and no greater than that length. Mark malformed images
INVALID through the existing verify_state publication path so peers do not
remain in VERIFYING, and add a regression test covering a valid header and
identity fields with oversized total_bytes.
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📒 Files selected for processing (17)
docs/investigations/2026-08-hbg-graph-definition-single-upload.mddocs/investigations/README.mdsrc/a2a3/runtime/host_build_graph/host/runtime_maker.cppsrc/a2a3/runtime/host_build_graph/runtime/orchestrator_core/pto_orchestrator.cppsrc/a5/runtime/host_build_graph/host/runtime_maker.cppsrc/a5/runtime/host_build_graph/runtime/orchestrator_core/pto_orchestrator.cppsrc/common/host_build_graph/graph_execution.cppsrc/common/host_build_graph/graph_execution.hsrc/common/host_build_graph/graph_host_state.hsrc/common/platform/include/common/host_api.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/sim/host/c_api_shared.cppsrc/common/platform/sim/host/device_runner_base.cppsrc/common/platform/sim/host/device_runner_base.htests/ut/cpp/common/test_hbg_graph_cache.cpp
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@coderabbitai Addressed the additional review-body findings:
The two inline findings are fixed and resolved: Definition hashing is bounded by the retained byte length, and the H2D investigation now distinguishes the one shared Definition upload from the forty reference submissions. |
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Upload each distinct Graph Definition once per run and let Graph submissions reference the retained device object. Remove duplicate Definition storage from Graph executions while preserving content validation and affine reuse. Record the retained object length so malformed total_bytes values are rejected before hashing, remove the unused legacy Definition accessor, and use architecture-specific hints while waiting for peer verification. Add shared wire-format coverage, dirty-storage guardrails, and an investigation record that distinguishes the shared Definition upload from per-submission reference uploads.
ChaoWao
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Aug 18, 2026
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Rebased onto main after the shared Graph Definition upload (hw-native-sys#1874) landed: submissions now reference a runner-retained Definition device object, so the eager uploader creates that object lazily on first reference instead of a batched pre-pass. The eager-upload hook and pinned bump arena now live on the run-owned GraphHostState instead of process globals, with an RAII guard clearing the hook on every exit path, so overlapping orchestrations cannot clobber each other's uploader or bump cursor. Retained device submission storage moves from a process-lifetime static map with a lossy packed key to a new runner-owned HostApi op (acquire_graph_submission_buffer) keyed by (graph_key, occurrence), released at Worker finalization like the execution and Definition buffers. An eager-upload failure after the outer GRAPH task is published now latches EXPLICIT_ORCH_FATAL instead of returning an ordinary-path fallback, which would have re-submitted the graph body on top of a half-uploaded task. Co-Authored-By: Claude <noreply@anthropic.com>
yanghaoran29
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Rebased onto main after the shared Graph Definition upload (hw-native-sys#1874) landed: submissions now reference a runner-retained Definition device object, so the eager uploader creates that object lazily on first reference instead of a batched pre-pass. The eager-upload hook and pinned bump arena now live on the run-owned GraphHostState instead of process globals, with an RAII guard clearing the hook on every exit path, so overlapping orchestrations cannot clobber each other's uploader or bump cursor. The pinned arena is allocated through dlopen-resolved aclrt entry points, falling back to plain host memory where no Ascend toolkit is present (sim builds, CI runners). Retained device submission storage moves from a process-lifetime static map with a lossy packed key to a new runner-owned HostApi op (acquire_graph_submission_buffer) keyed by (graph_key, occurrence), released at Worker finalization like the execution and Definition buffers. An eager-upload failure after the outer GRAPH task is published now latches EXPLICIT_ORCH_FATAL instead of returning an ordinary-path fallback, which would have re-submitted the graph body on top of a half-uploaded task. Both a2a3 and a5 host_build_graph carry the change.
yanghaoran29
added a commit
to yanghaoran29/simpler
that referenced
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Aug 18, 2026
Rebased onto main after the shared Graph Definition upload (hw-native-sys#1874) landed: submissions now reference a runner-retained Definition device object, so the eager uploader creates that object lazily on first reference instead of a batched pre-pass. The eager-upload hook and pinned bump arena now live on the run-owned GraphHostState instead of process globals, with an RAII guard clearing the hook on every exit path, so overlapping orchestrations cannot clobber each other's uploader or bump cursor. The pinned arena is allocated through dlopen-resolved aclrt entry points, falling back to plain host memory where no Ascend toolkit is present (sim builds, CI runners). Retained device submission storage moves from a process-lifetime static map with a lossy packed key to a new runner-owned HostApi op (acquire_graph_submission_buffer) keyed by (graph_key, occurrence), released at Worker finalization like the execution and Definition buffers. An eager-upload failure after the outer GRAPH task is published now latches EXPLICIT_ORCH_FATAL instead of returning an ordinary-path fallback, which would have re-submitted the graph body on top of a half-uploaded task. Both a2a3 and a5 host_build_graph carry the change.
yanghaoran29
added a commit
to yanghaoran29/simpler
that referenced
this pull request
Aug 18, 2026
Rebased onto main after the shared Graph Definition upload (hw-native-sys#1874) landed: submissions now reference a runner-retained Definition device object, so the eager uploader creates that object lazily on first reference instead of a batched pre-pass. The eager-upload hook and pinned bump arena now live on the run-owned GraphHostState instead of process globals, with an RAII guard clearing the hook on every exit path, so overlapping orchestrations cannot clobber each other's uploader or bump cursor. The pinned arena is allocated through dlopen-resolved aclrt entry points, falling back to plain host memory where no Ascend toolkit is present (sim builds, CI runners). Retained device submission storage moves from a process-lifetime static map with a lossy packed key to a new runner-owned HostApi op (acquire_graph_submission_buffer) keyed by (graph_key, occurrence), released at Worker finalization like the execution and Definition buffers. An eager-upload failure after the outer GRAPH task is published now latches EXPLICIT_ORCH_FATAL instead of returning an ordinary-path fallback, which would have re-submitted the graph body on top of a half-uploaded task. Both a2a3 and a5 host_build_graph carry the change.
3 of 5 tasks
5 of 6 tasks
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Graph submission PODs each went through their own device_malloc and copy_to_device at bind time — for a 40-layer decode that is 40 small copies per inference, each paying allocation and H2D setup. The submission image was also built into a per-upload std::vector first, so the bytes were gathered twice. The host runtime now keeps a 16 MB pinned host arena (aclrtMallocHost, resolved with dlopen so sim/CI builds without an Ascend toolkit fall back to plain memory, which costs nothing there because sim copies are memcpy). graph_submit_definition writes each submission image directly into that bump as the orchestrator runs; after entry() the runtime copies the used prefix [base, used) to one retained device blob with a single copy_to_device and points each outer task's graph_context into the blob at its POD's pinned offset. The blob is reused across rounds while capacity fits, so the steady state is one allocation and one H2D per inference instead of forty. A POD that falls back to the std::vector path (bump exhausted) keeps the per-layer upload. Device-side byte layout is unchanged: the device reads the same GraphSubmission header, tensors and scalars at the same offsets; only the address each graph_context holds moves from a per-POD allocation into the shared blob. Definition objects keep their hw-native-sys#1874 shared per-content upload ahead of the submissions that reference them, and execution storage keeps its hw-native-sys#1884 carve from the outer task's heap. Measured on qwen3_14b_decode (a2a3, 50-round interleaved trim-mean): H2dGraph 646.5 -> 276.7 us (-57%), Gate 3.559 -> 2.711 ms (-24%); h2d_graph copies per inference 41 -> 1. Device span unchanged (44.83 -> 44.28 ms, 19208 tasks both sides).
yanghaoran29
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Graph submission PODs each went through their own device_malloc and copy_to_device at bind time — for a 40-layer decode that is 40 small copies per inference, each paying allocation and H2D setup. The submission image was also built into a per-upload std::vector first, so the bytes were gathered twice. The host runtime now keeps a 16 MB pinned host arena (aclrtMallocHost, resolved with dlopen so sim/CI builds without an Ascend toolkit fall back to plain memory, which costs nothing there because sim copies are memcpy). graph_submit_definition writes each submission image directly into that bump as the orchestrator runs; after entry() the runtime copies the used prefix [base, used) to one retained device blob with a single copy_to_device and points each outer task's graph_context into the blob at its POD's pinned offset. The blob is reused across rounds while capacity fits, so the steady state is one allocation and one H2D per inference instead of forty. A POD that falls back to the std::vector path (bump exhausted) keeps the per-layer upload. Device-side byte layout is unchanged: the device reads the same GraphSubmission header, tensors and scalars at the same offsets; only the address each graph_context holds moves from a per-POD allocation into the shared blob. Definition objects keep their hw-native-sys#1874 shared per-content upload ahead of the submissions that reference them, and execution storage keeps its hw-native-sys#1884 carve from the outer task's heap. Measured on qwen3_14b_decode (a2a3, 50-round interleaved trim-mean): H2dGraph 646.5 -> 276.7 us (-57%), Gate 3.559 -> 2.711 ms (-24%); h2d_graph copies per inference 41 -> 1. Device span unchanged (44.83 -> 44.28 ms, 19208 tasks both sides). Follow-up (CI st-onboard-a5 hang): the arena was a process-static aclrtMallocHost block with no release path — ChipWorker::finalize dlclose's the runtime SO after rtDeviceReset/aclFinalize, so the pinned mapping was never freed and a driver-side DMA registration outlived the process. The next process granted the same card hung in chip bring-up (two vis_isolation subprocesses SIGKILLed at 600 s on the a5 runner). The arena now belongs to the DeviceRunner, like retained_temp and the graph-definition buffers: a new HostApi op acquire_pinned_host_buffer returns a runner-retained, alignment-guaranteed block (onboard: aclrtMallocHost, linked directly; sim: aligned host memory through the existing graph-definition map). finalize_common() aclrtFreeHost's it on both the healthy and fatal paths, before the device reset. The per-bind cost is one map lookup once the block settles at 16 MB, so the measured H2D win is unchanged. Also fixed while here: acquire_submission's retained-buffer key packed (graph_key << 32) ^ occurrence, discarding graph_key's upper 32 bits — two graphs agreeing in the low half shared one device buffer. The key is now an FNV-1a mix over the full 64-bit key plus the occurrence. The 64-byte bump alignment constant moved to graph_host_state.h so the base passing through HostApi carries the same guarantee the bump assumes.
yanghaoran29
added a commit
to yanghaoran29/simpler
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Aug 19, 2026
Graph submission PODs each went through their own device_malloc and copy_to_device at bind time — for a 40-layer decode that is 40 small copies per inference, each paying allocation and H2D setup. The submission image was also built into a per-upload std::vector first, so the bytes were gathered twice. The host runtime now keeps a 16 MB pinned host arena (aclrtMallocHost, resolved with dlopen so sim/CI builds without an Ascend toolkit fall back to plain memory, which costs nothing there because sim copies are memcpy). graph_submit_definition writes each submission image directly into that bump as the orchestrator runs; after entry() the runtime copies the used prefix [base, used) to one retained device blob with a single copy_to_device and points each outer task's graph_context into the blob at its POD's pinned offset. The blob is reused across rounds while capacity fits, so the steady state is one allocation and one H2D per inference instead of forty. A POD that falls back to the std::vector path (bump exhausted) keeps the per-layer upload. Device-side byte layout is unchanged: the device reads the same GraphSubmission header, tensors and scalars at the same offsets; only the address each graph_context holds moves from a per-POD allocation into the shared blob. Definition objects keep their hw-native-sys#1874 shared per-content upload ahead of the submissions that reference them, and execution storage keeps its hw-native-sys#1884 carve from the outer task's heap. Measured on qwen3_14b_decode (a2a3, 50-round interleaved trim-mean): H2dGraph 646.5 -> 276.7 us (-57%), Gate 3.559 -> 2.711 ms (-24%); h2d_graph copies per inference 41 -> 1. Device span unchanged (44.83 -> 44.28 ms, 19208 tasks both sides). Follow-up (CI st-onboard-a5 hang): the arena was a process-static aclrtMallocHost block with no release path — ChipWorker::finalize dlclose's the runtime SO after rtDeviceReset/aclFinalize, so the pinned mapping was never freed and a driver-side DMA registration outlived the process. The next process granted the same card hung in chip bring-up (two vis_isolation subprocesses SIGKILLed at 600 s on the a5 runner). The arena now belongs to the DeviceRunner, like retained_temp and the graph-definition buffers: a new HostApi op acquire_pinned_host_buffer returns a runner-retained, alignment-guaranteed block (onboard: aclrtMallocHost, linked directly; sim: aligned host memory through the existing graph-definition map). finalize_common() aclrtFreeHost's it on both the healthy and fatal paths, before the device reset. The per-bind cost is one map lookup once the block settles at 16 MB, so the measured H2D win is unchanged. Also fixed while here: acquire_submission's retained-buffer key packed (graph_key << 32) ^ occurrence, discarding graph_key's upper 32 bits — two graphs agreeing in the low half shared one device buffer. The key is now an FNV-1a mix over the full 64-bit key plus the occurrence. The 64-byte bump alignment constant moved to graph_host_state.h so the base passing through HostApi carries the same guarantee the bump assumes.
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Summary
Performance
Measured with
examples/a2a3/host_build_graph/qwen3_14b_decode, 40 layers, batch 16, sequence length 3500, on a2a3 onboard with chip swimlane level 4:graph_submit: 2847.277 us -> 111.200 us (-96.1%).host_orch: 4204.381 us -> 847.818 us (-79.8%).graph_upload: 15.025 ms -> 12.050 ms in the single trace; exact timing includes run-to-run noise.Testing
test_graph_cacheandtest_a5_graph_cacheC++ unit tests.GraphExecutionBatch16Seq3500, including golden validation and level-4 swimlane collection.