Comrade Chief Designer
0465b9b5a7
Five runs of the changelist now reproduce the same single failure with breaks genuinely
tolerated (patch 01+02+03+04, VLLM_COMPILE_FULLGRAPH=0, VLLM_USE_AOT_COMPILE=0,
R4D_GLM_FUSE_QKV_RMSNORM=0): the trunk TRACES ('Dynamo bytecode transform time: 1.08 s')
and the boot dies on KeyError: 'in_proj_qkvbfg_a'.
What it is NOT, each ruled out by measurement rather than argument:
- not one of dynamo's four nn_modules lookups: /home/dank/dynamo-probe wraps three of
them and stayed silent over two runs, with the probe's install line confirmed in both
the API-server and worker processes;
- not a dynamo-internal failure: TORCHDYNAMO_VERBOSE=1 adds no internal stack trace;
- not a literal string lookup: the name appears tree-wide only as the KDA layer's
attribute (kda.py:217, used at :407) and in the load_weights shard table
(model.py:780-785); the four sites in the
quantization utils do compute exactly this bare key but every one is guarded
(), so none can raise it;
- not the pluggable-layer registry, which is keyed by class name.
What it IS: a plain Python KeyError raised inside the traced
Glm5NextDecoderLayer.forward, in a callee dynamo INLINED (frame chain
profile_run -> _dummy_run -> execute_model -> glm4_1v.py:2358 -> the compile wrapper ->
eval_frame.compile_wrapper -> Glm5NextModel.forward:748 -> module._call_impl ->
Glm5NextDecoderLayer.forward:456; the reported line is that method's def line, which is
how inlined frames surface).
Patch 03's header and the runbook now record the remaining instrument (TORCH_LOGS=+dynamo
and grep, or wrap the inlining candidates — the mHC CustomOps and the indexer op — with a
KeyError probe), and the two breaks that are real but non-fatal in this configuration
(patch 04's fused-norm launcher cell, patch 05's workspace acquisition).
tests/run.sh: 362 seams pass.
117 lines
6.5 KiB
Diff
117 lines
6.5 KiB
Diff
# glm53-compile-03-fullgraph-optout.patch — let torch.compile split the graph instead
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# of failing on a break.
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#
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# STATUS: WIP — third of three patches in the "compile the GLM trunk" changelist.
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# With 01+02+03 the model TRACES, then hits the NEXT blocker (below). The set does not
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# yet boot the engine; nothing in scripts/ mounts it.
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#
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# THE BREAK: with 01+02 mounted the worker dies with
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#
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# RuntimeError: Graph breaks are not supported with aot compile.
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# Please use torch.compile(fullgraph=True).
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#
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# because vllm/compilation/wrapper.py calls torch.compile(..., fullgraph=True, ...) and
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# this build has AOT compile on by default (VLLM_USE_AOT_COMPILE). The GLM trunk cannot
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# satisfy fullgraph: its indexer metadata path syncs to the host —
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# models/glm5next/amd/sparse_indexer.py:263 int(positions[...].max().item()) + 1
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# models/glm5next/amd/sparse_indexer.py:419 lmax = int(decode_metadata.decode_lens.max().item())
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# — and a .item() inside a captured graph is not expressible.
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#
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# WHAT WAS VERIFIED (in-image, torch 2.11.0+rocm10.0, torch.compile(backend="eager")):
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#
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# fullgraph=True suppress_errors=False -> RAISE Unsupported
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# fullgraph=True suppress_errors=True -> RAISE Unsupported <-- suppress_errors
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# does NOT cover breaks
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# fullgraph=False suppress_errors=False -> ok (traceable segments compiled by
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# inductor, the rest runs eagerly;
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# numerics unchanged)
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#
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# So breaks must be TOLERATED, not suppressed: the traceable mass still fuses. This
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# patch makes the fullgraph requirement opt-out via VLLM_COMPILE_FULLGRAPH=0 (default 1,
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# so every other model keeps stock behaviour), and the run also needs
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# VLLM_USE_AOT_COMPILE=0 because AOT compile refuses breaks outright.
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#
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# TARGET: vllm/compilation/wrapper.py (inside the pinned image)
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# base sha256 969961dca41c78385212e985cfc0c57ef067f4a2d7490c73c658c600a1b95cac
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# patched sha256 732363bb1a1367772f13c60a655c678e7e2e9e56186677b14238f5e84cac31b3
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# (the file already imports os; the patch does not add a second import)
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#
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# NEXT BLOCKER — NOT FIXED HERE. With 01+02+03 and
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# R4D_GLM_COMPILE=1 VLLM_COMPILE_FULLGRAPH=0 VLLM_USE_AOT_COMPILE=0 the trunk traces
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# ("Dynamo bytecode transform time: 1.08 s") and then the worker dies during profile_run
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# on the decode forward:
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#
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# KeyError: 'in_proj_qkvbfg_a'
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# model.py:748 Glm5NextModel.forward hidden_states, residual, post, comb = layer(...)
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# model.py:456 Glm5NextDecoderLayer.forward
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#
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# `in_proj_qkvbfg_a` is the KDA layer's merged column-parallel projection
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# (models/glm5next/common/kda.py:217, called at :407) — and it is also a name in the
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# load_weights shard table (model.py:780-785), i.e. a real submodule attribute name,
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# not an arbitrary string.
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#
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# WHERE IT IS THROWN (established 2026-09-30 by reading the full traceback, since the
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# report line is inside dynamo-rewritten code): torch/_dynamo keeps a name -> module map
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# and looks it up by name — output_graph.py:1259 / :1384 register into `nn_modules`,
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# :3000 does `self.nn_modules[node.target]` (a bare-name KeyError when absent), and
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# :1225 documents stripping "_buffers[..]/_parameters[..]/_modules[..]" from those
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# names. So the compiler is failing to RESOLVE A SUBMODULE BY NAME while tracing the
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# GLM decoder layer. Whether the root cause is the fork's module tree (something
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# dynamo cannot register statically) or dynamo's own registration is NOT yet settled.
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#
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# STATUS OF THAT BLOCKER (updated 2026-09-30, after the diagnostics below):
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# * TORCHDYNAMO_VERBOSE=1 adds NO internal stack trace -> it is a plain Python
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# KeyError raised in a callee dynamo INLINED into Glm5NextDecoderLayer.forward
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# (the reported line 456 is that method's `def` line, which is how inlined frames
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# surface).
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# * It is NOT raised from dynamo's four nn_modules lookups: the probe in
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# /home/dank/dynamo-probe wraps three of them and stayed silent over two runs with
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# the probe confirmed installed in the API-server and worker processes.
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# * It is NOT a literal string lookup: the name appears tree-wide only as the KDA
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# layer's attribute (kda.py:217, used at :407) and in the load_weights shard table
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# (model.py:780-785). The four `proj_name = prefix.split(".")[-1]` sites in the
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# quantization utils do compute exactly this bare key, but each is guarded
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# (`if proj_name not in fused_mapping: return`), so none of them can raise it.
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# * It reproduces on every run of this configuration (5 of 5).
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# REMAINING INSTRUMENT: name the inlined caller. Either `TORCH_LOGS=+dynamo` on a boot
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# and grep the log for the key (dynamo prints inlined frames with source), or wrap the
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# inlining candidates in that forward — the mHC CustomOps (hc_pre / hc_post /
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# hc_fused_post_pre in layers/mhc.py) and the indexer op — with a KeyError-reporting
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# probe. Until that names the caller this is a dynamo-side name-resolution failure.
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# NOTE the launcher gotcha that wasted a boot earlier: the scratch launcher now
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# preserves ENVARGS (`ENVARGS="${ENVARGS:-}"`), but it previously reset it, silently
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# dropping outer env vars.
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#
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# SECOND BLOCKER, KNOWN AND NOT FATAL IN THIS CONFIG: the indexer's in-forward
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# workspace acquisition (patch 05 makes it compiler-opaque) and the fused-norm
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# launcher cell (patch 04 removes the call) are real breaks, but with
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# VLLM_COMPILE_FULLGRAPH=0 they are tolerated — they only become fatal under
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# fullgraph=True, which this trunk can never satisfy anyway.
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--- a/vllm/compilation/wrapper.py
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+++ b/vllm/compilation/wrapper.py
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@@ -19,6 +19,15 @@
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logger = init_logger(__name__)
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+
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+# FORK-LOCAL (patch: fullgraph opt-out). torch.compile(fullgraph=True) turns any
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+# dynamo graph break into a hard failure; suppress_errors does NOT cover breaks
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+# (verified in-image, torch 2.11+rocm10.0). With VLLM_COMPILE_FULLGRAPH=0 the
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+# traceable segments are still compiled by inductor and the untraceable ones run
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+# eagerly, which is what a model with device-sync metadata (the GLM-5.3-Flash
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+# indexer) needs. Default 1 keeps stock behaviour for every other model.
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+_FULLGRAPH = os.environ.get("VLLM_COMPILE_FULLGRAPH", "1") == "1"
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+
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R = TypeVar("R")
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P = ParamSpec("P")
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@@ -146,7 +155,7 @@
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with aot_context:
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self._compiled_callable = torch.compile(
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compiled_ptr,
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- fullgraph=True,
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+ fullgraph=_FULLGRAPH,
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dynamic=False,
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backend=backend,
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options=options,
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