⚡ Bolt: Update journal with CC3D loop safety learnings - #89
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Co-authored-by: NoWon1 <126711057+NoWon1@users.noreply.github.com>
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🟡 Changes recommended
The added journal guidance has a likely incorrect/overly-absolute statement (“never remove checks”) and a confusing out-of-order date that should be clarified to avoid misleading future optimizations.
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Pull request overview
This PR updates the project’s .jules/bolt.md engineering journal with a new CC3D steppable “safety and semantics” learning focused on avoiding physics/semantics regressions from loop fusion and avoiding KeyError crashes related to per-cell state during division.
Changes:
- Added a new journal entry describing why combining sequential physics loops can alter simulation semantics.
- Documented a warning about
cell.id-keyed state dictionaries andKeyErrorrisk as cells are created/divide.
File summaries
| File | Description |
|---|---|
.jules/bolt.md |
Adds a new CC3D steppable safety/semantics learning entry to the Bolt journal. |
Review details
- Files reviewed: 1/1 changed files
- Comments generated: 2
- Review effort level: Lite
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| ## 2026-08-30 - Pre-calculate nested spatial loops bounds in CC3D | ||
| **Learning:** Checking boundary conditions (e.g., `0 <= x < self.dim.x`) during *every single iteration* inside tightly nested loops degrades performance in operations executed frequently per MCS (like cell removals or checking neighborhood contacts). | ||
| **Action:** When a bounding box is known relative to a central coordinate, use `min` and `max` with grid dimensions *outside* the loop to strictly bound the `range()` generators, completely eliminating conditionally evaluated boundary checks inside the innermost loop body. | ||
| ## 2023-10-27 - CC3D Steppable Safety and Semantics |
| **Learning:** In CompuCell3D, attempting to optimize `O(N)` loops by combining sequential physics operations (like secretion then degradation) into a single iteration over `self.cell_list` alters the fundamental physics of the simulation by interleaving state updates. Additionally, `self.cell_list` is dynamic; removing dictionary existence checks for `cell.id` on hot paths causes `KeyError` regressions when cells divide. | ||
| **Action:** Do not combine sequential loop operations that compute distinct simulation steps. Never remove `cell.id` initialization checks from state dictionaries in hot paths, as cells are dynamically created during the simulation. |
Added learnings to
.jules/bolt.mddetailing why combining sequential physics loops and removing cell.id existence checks in CompuCell3D steppables causes simulation semantics regressions andKeyErrorcrashes. No functional codebase changes were made since the hot paths were already optimized.PR created automatically by Jules for task 10779989404219619225 started by @NoWon1