| # Can I ask global route to fail early? |
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| Tool: Global Routing |
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| Subcategory: Global routing timeout |
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| ## Conversation |
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| ### oharboe |
| @nerriav Global routing takes very little time for the project I am working on. However, when I make changes, these sometimes can make global routing impossible and I have to tweak my change.
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| When global routing fails, it doesnt fail quickly, it just runs "forever"(hours compared to minutes) before it ultimately fails.
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| Can I adjust a setting such that global route fails quickly so that I dont waste server build resources and I can quickly load the routing congestion report in the DRC viewer to drill down to the problem? |
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| ### rovinski |
| In OR you can use the `-congestion_interations` argument which translates to `GLOBAL_ROUTE_ARGS=" -congestion_iterations X "` in ORFS. X is a positive integer. The default is 100. |
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| ### oharboe |
| Syntax subtleties... `export GLOBAL_ROUTE_ARGS="-congestion_iterations 10 -verbose"`, failed with `[ERROR STA-0402] global_route -congestion_iterations 10 -verbose is not a known keyword or flag.`
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| `export GLOBAL_ROUTE_ARGS=-congestion_iterations 10 -verbose` worked...
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| It is still stuck on:
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| ```
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| [INFO GRT-0101] Running extra iterations to remove overflow.
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| ```
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| With `export GLOBAL_ROUTE_ARGS=-congestion_iterations 2 -verbose` it fails after 2:30 minutes.
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| I'll see how high I can make it until it "runs forever". If it fails after 10 minutes, then I have something I can try out. If there is nothing wrong, I would expect it to complete in ca. 3 minutes.
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| I'm curious if 10 iterations is enough for all the designs under test... https://github.com/The-OpenROAD-Project/OpenROAD-flow-scripts/pull/1076 |
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