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Retain prepared launcher ownership and collective priming barriers on master - #466
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The preparation-session path (77351c1) resolves RoCE declarations through _dtypes(), which normalizes caller strings like 'float16' to torch.dtype objects, then compile_roce passes them straight into get_launcher. get_launcher's signature is dtype_name: str and _RoceOneshotLaunch rejects anything else against _DTYPE_PACK_ELEMS, so every weights-stage RoCE preparation dies with "unsupported RoCE one-shot dtype torch.float16" before the first collective. The old runtime path converted objects to names via _DTYPE_NAMES in roce_oneshot._launcher_key; the preparation path bypasses it. Normalize torch.dtype objects to their names at get_launcher entry, matching the conversion the runtime path already applies. Both call forms now reach the kernel gate; string behavior is unchanged. Reproduced and verified host-side: torch.float16 object clears the dtype gate post-fix (raising only the orthogonal threads check), and the string form is byte-identical in behavior. Pre-existing E501s and stale PCIe comm tests are untouched by this change.
…alues
Eight PCIe compile surfaces return the plain launch closure over their
annotated native program without attaching the program identity:
_dcp_a2a_cute: lse_reduce_scatter, all_gather_heads, all_gather_pair,
kimi_topk16
_dcp_topk_cute: owner stage
_hierarchical_cute: hierarchical launcher
_island_rs_cute: island reduce-scatter launcher
_vocab_argmax_cute: vocab argmax launcher
describe_compilation and every evict sweep call program_keys() over
those values; a plain function matches nothing, so any unit whose
CompileJob resolves one of these surfaces, or any evict_unretained pass
that reaches a cache holding one, dies with 'compile factory returned
an unannotated function'. On GB10 this surfaced mid norm.mhc racing
because the compile pool and eviction sweep span all registered caches,
not just the racing unit.
Wrap each closure with attach_programs(run, raw) so it carries its
program into retention and sweep keys. Additionally, program_keys now
treats plain functions as opaque retained values instead of raising:
a launcher closure produced outside a compile factory has no program
identity to lose, and eviction must never kill a live race. Factories
that return a carrierless closure still fail describe_compilation's
empty-carry guard, so the preparation contract is unchanged.
Verified host-side: plain function sweeps to (), wrapped closure
carries its ProgramKey, dict-of-annotated factories unchanged,
describe_compilation still rejects carrierless factories, exotic
unannotated objects still raise. Preparation host lane: 490 passed,
1 failed (test_device_reclaim selection-source assert) which fails
identically without this change.
compile_twoshot_surface resolves FP8 surfaces through get_twoshot_launcher, which returned a bare closure, so describe_compilation saw zero program carriers — same class as the RoCE and PCIe one-shot gaps. The BF16 getters already attach.
A collective authorization is consumed in the round after the exchange, and the local work before either rank launches (autotune races) is unbounded, so the kernel-side spin window ended up covering round time instead of launch jitter. Sessions now accept an optional collective_barrier(key, ranks) hook; when a blocked CollectiveRequirement is authorized, the job waits for every participant rank to enter before resuming. Timeout budget defaults to 120s via B12X_COLLECTIVE_BARRIER_TIMEOUT; timeouts raise CollectiveBarrierTimeout carrying key, ranks, and arrived sets.
torch's cpp_extension staleness check is mtime-based and does not survive a persisted TORCH_EXTENSIONS_DIR, so a changed _memory.cpp next to an old cached .so loaded stale symbols (missing release_graph_pool_cache). Key the extension name by the cpp content hash so any source change gets a fresh build directory.
get_launcher accepts str or torch.dtype. The torch.dtype spelling went through a bare dict lookup, so an unsupported dtype raised KeyError while the string spelling raised the documented ValueError from _RoceOneshotLaunch. Convert the lookup failure to the same ValueError.
Retain cross-rank collective priming and compiler program carriers while preserving master-scoped reclamation and RoCE shared-result ownership. Selected preparation, layout and RoCE tests pass (209 cases in the Kimi composition).
…aration-publication # Conflicts: # b12x/preparation/session.py
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Included review availability: This review used your included allowance. Your plan provides up to 2 included reviews per hour; 1 remain after this review. 📝 WalkthroughWalkthroughThis change updates compiler-program discovery and selected launcher retention, adds collective-barrier coordination to preparation sessions, hashes preparation extension source into extension names, and extends RoCE launcher dtype handling. ChangesPreparation and launch flow
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Bug fix Sequence Diagram(s)sequenceDiagram
participant PreparationJob
participant BarrierThread
participant CollectiveBarrier
PreparationJob->>BarrierThread: Start callback with requirement key and ranks
BarrierThread->>CollectiveBarrier: Invoke callback
CollectiveBarrier-->>BarrierThread: Return result or raise exception
BarrierThread-->>PreparationJob: Report completion or timeout
Suggested reviewers: Merge Risk: ⚪ Minimal · up to No actionable merge-blocking issue is established for this change. Normal checks and maintainer review can proceed; the reported tests do not qualify arbitrary RoCE hardware or process groups. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to The optional barrier preserves collective metadata and prevents another job in the same session while a timed-out callback remains active. No externally reachable authorization bypass is established. However, replacing or closing a session does not drain that callback, so safe recovery against a shared collective backend depends on the caller. Retained concerns
Security review detailsSecurity Blast Radius
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Caution Pre-merge checks failedPlease resolve all errors before merging. Addressing warnings is optional.
❌ Failed checks (1 error)
✅ Passed checks (8 passed)
Full details: Context-Independent Repository ProseExplanation The PR description contains development-history prose rather than a self-contained account of the resulting change. It says Resolution Remove the PR description’s ancestry, prior-PR comparison, merge-process, and duplicate-work narrative. State the implemented launcher ownership and optional collective barrier behavior, compatibility, and validation as self-contained facts, with test conditions and results stated directly. Replace the merge commit subject with a behavior-focused subject, or omit that history-only message from the reviewed commit set.
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Actionable comments posted: 2
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @b12x/comm/pcie/_vocab_argmax_cute.py:
- Line 8: Remove the redundant attach_programs import from the module, keeping
only its existing import binding.
Review comments at @b12x/preparation/session.py:
- Around line 130-138: Remove the import-time `_BARRIER_TIMEOUT_SECONDS`
evaluation. Resolve `_barrier_timeout_seconds()` once in
`PreparationSession.__init__` only when `collective_barrier` is not `None`,
store the result on the session, and have `_collective_barrier` use
`self.session._barrier_timeout` when creating `CollectiveBarrierTimeout`.
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.lil/changes/b12x-preparation-launch-ownership.jsonb12x/_lib/compile_plan.pyb12x/comm/pcie/_dcp_a2a_cute.pyb12x/comm/pcie/_dcp_topk_cute.pyb12x/comm/pcie/_hierarchical_cute.pyb12x/comm/pcie/_island_rs_cute.pyb12x/comm/pcie/_twoshot_cute.pyb12x/comm/pcie/_vocab_argmax_cute.pyb12x/comm/roce/_oneshot_cute.pyb12x/preparation/__init__.pyb12x/preparation/_memory.pyb12x/preparation/session.pytests/comm/test_roce_preparation_compile.pytests/preparation/test_first_use_compile.pytests/preparation/test_session.py
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Validate barrier configuration only for callers that enable a callback. Preserve the captured deadline across environment changes and retain callback failure containment. Remove a duplicate launcher import. Co-authored-by: OpenAI Codex <noreply@openai.com> Signed-off-by: Martin Vit <martin@voipmonitor.org>
Co-authored-by: OpenAI Codex <noreply@openai.com> Signed-off-by: Martin Vit <martin@voipmonitor.org>
…rozen-20261006T052218Z-2bca98-466
…rozen-20261006T052218Z-2bca98-466
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Retain compiled program owners for prepared PCIe launchers, normalize RoCE one-shot dtypes, and distinguish plain Python launch closures from Triton launchers. Native allocator extension names include their source hash.
Add an optional
PreparationSession(collective_barrier=...)callback before authorized collective priming. The callback runs on a daemon thread;B12X_COLLECTIVE_BARRIER_TIMEOUTsets a finite positive timeout (default 120 seconds). A timeout reports unknown arrivals honestly and blocks another preparation job until the callback drains. The default remains disabled.Validation: 116 tests passed across session lifecycle, first-use compilation, and RoCE preparation compilation on SM120 with CUTLASS DSL 4.7.1. These cover ownership and host coordination; physical multi-rank communication was not exercised.