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Is there a way to dump intermediate global routing information? I want to get congestion-aware Steiner trees from FastRoute and the congestion maps/grids that these trees were generated from (not the final congestion).

I saw the `global_route_debug` command but I can't use it because it didn't highlight Steiner trees on the OpenROAD GUI when I interrupted the flow by adding `gui::show` just before `global_route` was called. Also, this debug command is only supposed to show them in the GUI but I need to save them to a file somehow.

What if you set the -congestion_iterations of global_route to 0?

In openlane, this is $GRT_ALLOW_CONGESTION

I wonder if that second one just lets global routing "succede" when there is still congestion. You will want to stop the flow at global routing, I'm guessing.

Most of the debugs are about visualizing intermediate results for debugging rather than dumping them out.  I think the overflow iterations is a good suggestion.