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Add iteration trace diagnostics for seed43

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Jan Petykiewicz 2026-04-02 16:15:02 -07:00
commit 3b7568d6c9
14 changed files with 2700 additions and 13 deletions
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docs/optimization_pass_01_log.md
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@ -3629,3 +3629,14 @@ Findings:
| example_07_large_scale_routing_no_warm_start | pair_local_search_attempts | - | 2.0000 | - |
| example_07_large_scale_routing_no_warm_start | pair_local_search_accepts | - | 2.0000 | - |
| example_07_large_scale_routing_no_warm_start | pair_local_search_nodes_expanded | - | 68.0000 | - |
## Step 64 seed-43 iteration-trace diagnosis
Measured on 2026-04-02T16:11:39-07:00.
Findings:
- Added `capture_iteration_trace` plus `scripts/record_iteration_trace.py` and tracked the first `seed 42` vs `seed 43` no-warm comparison in `docs/iteration_trace.json` and `docs/iteration_trace.md`.
- The pathological `seed 43` basin is not front-loaded. It matches the solved `seed 42` path through iteration `5`, then falls into three extra iterations with only `4` completed nets and `4` conflict edges.
- The late blowup is concentrated in two nets, not the whole routing set: `net_06` contributes `31604` attributed nodes and `83752` congestion checks, while `net_03` contributes `27532` nodes and `75019` congestion checks.
- This points the next optimization work at late-iteration reroute behavior for a small subset of nets rather than another global congestion or pair-local-search change.