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The-OpenROAD-Project / OpenLane

OpenLane is an automated RTL to GDSII flow based on several components including OpenROAD, Yosys, Magic, Netgen and custom methodology scripts for design exploration and optimization.
https://openlane.readthedocs.io/
Apache License 2.0
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[ERROR GRT-0118] Routing congestion too high with latest Openlane Tool (Git version: 4476a58407d670d251aa0be6a55e5391bb181c4e) Same design was sucessfully routed with older version of openlane tool set. #1243

Closed dineshannayya closed 1 year ago

dineshannayya commented 1 year ago

Description

I have been using this macro being used from MPW-3 onwards. This block was successfully rooted in previous version of Openlane tool tools set from MPW-3 to MPW-6. But with latest Openlane update I am unable to route this block.

I am looking suggestion to Route this block. This block has lot's of interconnect signal and PL_TARGET_DENSITY is set a small value of 0.20.

Environment

python3 ./env.py issue-survey
Kernel: Linux v5.15.0-41-generic
Distribution: ubuntu 20.04
Python: v3.8.10 (OK)
Container Engine: docker v20.10.17 (OK)
OpenLane Git Version: 4476a58407d670d251aa0be6a55e5391bb181c4e
pip: INSTALLED
python-venv: INSTALLED
---
PDK Version Verification Status: OK
---
Git Log (Last 3 Commits)

4476a58 2022-07-29T16:03:10+02:00 Sky130 Enhancements (#1240) - Mohamed Gaber -  (HEAD -> master)
4f63c8c 2022-07-27T17:26:27+02:00 Various CI Fixes (#1235) - Mohamed Gaber -  ()
0b55101 2022-07-26T20:37:20+02:00 [BOT] Update openroad_app (#1219) - Openlane Bot -  ()
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Git Remotes

origin  https://github.com/efabless/OpenLane.git (fetch)
origin  https://github.com/efabless/OpenLane.git (push)

Reproduction Material

issue_reproducible.tar.gz

Expected behavior

Clean Openlane flow

Logs

ERROR]: during executing openroad script /openlane/scripts/openroad/groute.tcl
[ERROR]: Log: wb_interconnect/runs/wb_interconnect/logs/routing/20-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: 56774
[INFO GRT-0198] Via related Steiner nodes: 1329
[INFO GRT-0199] Via filling finished.
[INFO GRT-0111] Final number of vias: 94671
[INFO GRT-0112] Final usage 3D: 485592
[ERROR GRT-0118] Routing congestion too high.
Error: groute.tcl, 55 GRT-0118
child process exited abnormally
donn commented 1 year ago

@maliberty Thoughts?

maliberty commented 1 year ago

Do you have an example of a run that previously worked? It could be all sorts of things. All I can say now is that you have lots of vertical routing congestion that seems real.

dineshannayya commented 1 year ago

@maliberty This block was successfully routed from MPW-3 to MPW6 tool set. Normally set ::env(CELL_PAD) "8" configuration use help in previous version of the tool.

Attached the working case with MPW6 tool set. I have created this at scripts/openroad/droute.tcl stage.

working.mpw6.openroad_issue_reproducible.tar.gz

Kernel: Linux v5.15.0-41-generic
Distribution: ubuntu 20.04
Python: v3.8.10 (OK)
Container Engine: docker v20.10.17 (OK)
OpenLane Git Version: 0dc6fb79c91082b94f8ded78d70f8bacbab96bf2
pip: INSTALLED
pip:venv: INSTALLED
---
PDK Version Verification Status: OK
---
Git Log (Last 3 Commits)

0dc6fb7 2022-05-17T08:24:25-07:00 Enable PL_ROUTABILITY_DRIVEN and PL_TIME_DRIVEN (#1092) - Anton Blanchard -  (HEAD -> master, tag: 2022.05.18_02.12.32, origin/master, origin/HEAD)
fba1ad0 2022-05-17T14:45:07+02:00 Remove unnecessary calls to `read_verilog` (#1084) - Anton Blanchard -  ()
9d463c0 2022-05-17T14:43:10+02:00 Add `FP_IO_UNMATCHED_ERROR` flag (#1086) - Kareem Farid -  ()
vijayank88 commented 1 year ago

@dineshannayya If any of previous MPW designs failing please check this : https://github.com/The-OpenROAD-Project/OpenLane-MPW-CI Search for respective design name wb_interconnect and you can find scripts/wb_interconnect/config.tcl : https://github.com/The-OpenROAD-Project/OpenLane-MPW-CI/blob/c72552a358466ecb13309ed26ec5993f57aba473/scripts/wb_interconnect/config.tcl is your latest configuration setting to pass OpenLane flow.

Normally we've use RT_MAX_LAYER as met5, for hardening just use as met4.

Also few configuration names got changed. Please update those as well like CELL_PAD to DPL_CELL_PADDING GLB_RT_* to GRT_*

vijayank88 commented 1 year ago

This issue already part of OR issue and resolved: https://github.com/The-OpenROAD-Project/OpenROAD/issues/1655

dineshannayya commented 1 year ago

@vijayank88 Yes, with addition below two setting I am able complete the routing set ::env(GRT_ADJUSTMENT) 0.1 set ::env(DPL_CELL_PADDING) 1 We can close this issue