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Hello, I was generating the global route congestion file as per OR-flow-scripts, but the file does not actually save into reports directory. Meanwhile the global routing congestion is viewable (or generated) in GUI by clicking. But i figure these two might be separate.  Does anyone have any idea what's going on?
`global_route -guide_file $env(RESULTS_DIR)/route.guide \`
               `-congestion_iterations 100 \`
               `-congestion_report_file $env(REPORTS_DIR)/congestion.rpt \`
               `-verbose`

do `echo $env(REPORTS_DIR)` and see where it points

Using the default design_config (gcd/nangate45) i get `./reports/nangate45/gcd/base/congestion.rpt`

image.png

I dived into the GlobalRouter code, it seems that congestion reports don't really generate unless there is an overflow. Is this intended?

Yes. If there is no congestion, the report file will be empty or not get generated by default