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Draft: Phase 1 model for native-route parallel realization - #11385
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Operator wind-down: durable plan with the four GO conditions and the not-credited list; no implementation. Co-authored-by: Cursor <cursoragent@cursor.com>
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| - `std.realization` — `Placement.LocalChildProcess` (fifth arm). Serial `SourceRootEvalDriver` remains `LocalInProcess`. A prepare worker is a local OS process with its own address space, not a filesystem cache, not a remote host, not an accelerator. Do not nickname Placement as `WorkerKind`. Do not put the arm in `gunbc.compute`. Worker `RealizedStep` = `ExecuteEffect` + `LocalChildProcess` + `Recompute`. Parent merge stays `LocalInProcess` plus `ReadEffect` over worker artifacts (condition 3). Slice 1 does not take a Share cache obligation across siblings. | ||
| - `std.realization_width` — envelope is `process_memory_aware_spawn_width` (cores ∩ memory ∩ pids). This is the bound fold, not a second knob. Do not mint `NATIVE_SHARD_COUNT` / `--width`. `NATIVE_SHARD_INDEX` is an observation label only. |
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When memory or PID observations are unavailable—or the safe memory budget cannot fit one worker—the mandated process_memory_aware_spawn_width is not the claimed cores ∩ memory ∩ pids envelope: dag/std/realization_width.dag returns conservative_fallback_width directly for zero memory/PID inputs and clamps subunit memory capacity to one. An implementation following this plan could therefore return width 4 on a one-core host or admit W=1 when no worker fits, bypassing the later “above envelope refuses” requirement. Specify a feasibility refusal for these states, or name a stricter envelope operation before making this helper binding.
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…behind a fail-closed input contract Landing side chat ruling (2026-09-15) on #11385: the helper's conservative-fallback and minimum-one arms can answer outside the observed envelope, so the plan states the precondition and the named refusal rather than preserving a known-false binding. Text-only repair; no implementation is owed in this plan-only PR. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01DQyBe1FaYb3bFZmpTczetX
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Landing side chat verdict (2026-09-15): HOLD for one bounded text repair — the plan bound the width envelope to |
Summary
Placement.LocalChildProcess, width envelopeprocess_memory_aware_spawn_width, width choiceselect_realization,WorkOperationnot extended, instrumentscratch/deep-cat-655-span-bisect@5b41958d07d9.Not credited
Test plan
docs/plans/native-route-parallel-realization.mdagainst the GO message (three-arm acceptance, The exclusive row set becomes a keyed collection over a closed key #11374, digest-joined artifacts, contiguous slices).session/crisp-hawk-831/ Parallel realization of the native route: slice 1 fork-after-context prepare sharding (one context → manifest → workers → named merge with bidirectional identity+payload join; serial-vs-width-N acceptance on a pinned quiet host); slice 2 context map/reduce modeled, built after slice 1 proves #11378 is superseded and must not land.Made with Cursor