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Limit late reroutes to conflicting nets

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Jan Petykiewicz 2026-04-02 17:10:00 -07:00
commit 2c3aa90544
9 changed files with 377 additions and 1003 deletions
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docs/optimization_pass_01_log.md
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@ -3640,3 +3640,25 @@ Findings:
- 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.
## Step 65 stop after fully reached two-edge plateau
Measured on 2026-04-02T16:21:02-07:00.
Findings:
- Added a narrow late-iteration stop rule: once every net already reaches target and the best snapshot is down to the final `<=2` dynamic-conflict-edge basin, stop after the first no-improvement iteration and hand off to bounded pair-local repair.
- The solved seed-42 no-warm canary improved from `6` to `5` negotiated-congestion iterations and dropped from about `1764` to `1303` nodes and from `4625` to `2921` congestion checks, while staying `10/10/10`.
- The former seed-43 pathological basin collapsed from about `50s`, `61259` nodes, and `165223` congestion checks to about `2.53s`, `1691` nodes, and `4330` congestion checks, still finishing `10/10/10`.
- Guardrails held unchanged: warmed `example_07` stayed `10/10/10`, and `example_05_orientation_stress` stayed `3/3/3`.
## Step 66 reroute only current conflict nets in late all-reached phase
Measured on 2026-04-02T16:46:00-07:00.
Findings:
- Once all nets already reach target and the live conflict graph is down to `<=3` edges, the next negotiated iteration now reroutes only the currently conflicting nets instead of all nets.
- The solved seed-42 no-warm canary stayed `10/10/10` and improved from `50` routed nets / `1303` nodes / `2921` congestion checks to `44` routed nets / `1258` nodes / `2736` congestion checks.
- The seed-43 no-warm canary stayed `10/10/10` and improved from `60` routed nets / `1691` nodes / `4330` congestion checks to `46` routed nets / `1582` nodes / `3881` congestion checks.
- Guardrails held: warmed `example_07` stayed `10/10/10`, and `example_05_orientation_stress` stayed `3/3/3` while trimming slightly to `5` routed nets, `297` nodes, and `146` congestion checks.