Hi, I'm porting and old MPW-2 design to the gf180 PDK and what ever I try I always get:

Reached 20 congestion iterations with less than 15% of reduction between iterations. Routing congestion too high. Check the congestion heatmap in the GUI.

. I try to increase the size and reduce the density but always get to that point. Any good recommendations to reduce congestion?

please file github issue https://github.com/The-OpenROAD-Project/OpenLane/issues here with

issue_reproducible

also share repo link

you can install openroad, use

openroad -gui

and

source ./run.tcl

to re-run route again. Then you can know where the congestion located.

Hi just added the issue: https://github.com/The-OpenROAD-Project/OpenLane/issues/1519 the project git is: https://github.com/jaquerinte/space_shuttle_gf_node