[ERROR GRT-0118] Routing congestion too high.

[Sanchit-Gupta10]

Description

i am running openlane flow but it got stuck at global routing step i have also attached the config.json file.

Expected Behavior

the flow should be completed

Environment report

Kernel: Linux v6.5.0-35-generic
Distribution: ubuntu 22.04
Python: v3.10.12 (OK)
Container Engine: docker v24.0.5 (OK)
OpenLane Git Version: a35b64aa200c91e9eb7dde56db787d6b4c0ea12a
pip: INSTALLED
python-venv: INSTALLED
---
PDK Version Verification Status: FAILED
/home/sanchit/Sanchit/Semester_2/Seminar/caravel_user_project/dependencies/openlane_src/pdks/sky130A not found.
Traceback (most recent call last):
  File "/home/sanchit/Sanchit/Semester_2/Seminar/caravel_user_project/dependencies/openlane_src/dependencies/verify_versions.py", line 76, in verify_versions
    raise Exception(f"{pdk_dir} not found.")
Exception: /home/sanchit/Sanchit/Semester_2/Seminar/caravel_user_project/dependencies/openlane_src/pdks/sky130A not found.

Failed to verify sky130A.
---
Git Log (Last 3 Commits)

a35b64a 2023-02-22T11:46:16+02:00 Checkers updates (#1665) - Kareem Farid -  (grafted, HEAD, tag: 2023.02.23)
---
Git Remotes

origin  https://github.com/The-OpenROAD-Project/OpenLane (fetch)

Reproduction material

issue_reproducible.zip i have also added config.json file for reference config.json

Relevant log output

[STEP 16]
[INFO]: Running Global Routing (log: ../home/caravel_user_project/openlane/user_proj_example/runs/24_06_24_13_46/logs/routing/16-global.log)...
[ERROR]: during executing openroad script /openlane/scripts/openroad/groute.tcl
[ERROR]: Log: ../home/caravel_user_project/openlane/user_proj_example/runs/24_06_24_13_46/logs/routing/16-global.log
[ERROR]: Last 10 lines:
[INFO GRT-0101] Running extra iterations to remove overflow.
[WARNING GRT-0227] Reached 20 congestion iterations with less than 15% of reduction between iterations.
[INFO GRT-0197] Via related to pin nodes: 277576
[INFO GRT-0198] Via related Steiner nodes: 19441
[INFO GRT-0199] Via filling finished.
[INFO GRT-0111] Final number of vias: 393363
[INFO GRT-0112] Final usage 3D: 1859063
[ERROR GRT-0118] Routing congestion too high. Check the congestion heatmap in the GUI.
Error: groute.tcl, 36 GRT-0118
child process exited abnormally

[ERROR]: Creating issue reproducible...
[INFO]: Saving runtime environment...
OpenLane TCL Issue Packager

[vijayank88]

#unzip issue_reproducible.zip 
Archive:  issue_reproducible.zip
warning [issue_reproducible.zip]:  zipfile claims to be last disk of a multi-part archive;
  attempting to process anyway, assuming all parts have been concatenated
  together in order.  Expect "errors" and warnings...true multi-part support
  doesn't exist yet (coming soon).

zip file missing some more files. Attach a valid reproducible test case.

[Sanchit-Gupta10]

tmp.zip issue_reproducible_1.zip i have separated the temp folder from issue reproducible

[Sanchit-Gupta10]

@vijayank88 i have decreased the diode_insertion_strategy value from 4 to 3 and now the openlane flow is completed successfully. But, i didn't know exactly that whether it is correct way of handling this error or not?

[maliberty]

Does doing so result in fixing all antenna violations?

[vijayank88]

@Sanchit-Gupta10 Seems you're using last year OpenLane commit 2023.02.23. can you update your OpenLane to latest and try once.

[Sanchit-Gupta10]

Does doing so result in fixing all antenna violations?

@maliberty No, all violations are not fixed but it doesn't give any errors. earlier it shows that [INFO] [Iteration 1] Failed to reduce antenna violations (82->82), stopping iterations

and then i reduce the die area and then it shows this message [INFO] [Iteration 1] Failed to reduce antenna violations (54->54), stopping iterations

[Sanchit-Gupta10]

@Sanchit-Gupta10 Seems you're using last year OpenLane commit 2023.02.23. can you update your OpenLane to latest and try once.

okay i will try with latest version

[Sanchit-Gupta10]

@maliberty @vijayank88 during routing step this is showing [INFO] [Iteration 1] Failed to reduce antenna violations (54->54), stopping iterations

there is no error in the openlane flow so, can i proceed futher ??

[vijayank88]

Failed to reduce antenna violations (54->54), stopping iterations it means antenna violations not fixed completely.

[kareefardi]

@Sanchit-Gupta10 Check antenna report file inside reports/signoff