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huge number reported as minRC in routability driven placement #6664

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gadfort opened this issue Feb 7, 2025 · 0 comments
Open

huge number reported as minRC in routability driven placement #6664

gadfort opened this issue Feb 7, 2025 · 0 comments
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gpl Global Placement

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@gadfort
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gadfort commented Feb 7, 2025

Describe the bug

During routability driven placement, the minRC reported is sometimes very large:

[INFO GPL-0078] FinalRC lower than minRC (1000000015047466219876688855040.0000), min RC updated.

Expected Behavior

a reasonable number reported

Environment

OpenROAD v2.0-18781-gabcc0ea3f 
Features included (+) or not (-): +GPU +GUI +Python
This program is licensed under the BSD-3 license. See the LICENSE file for details.
Components of this program may be licensed under more restrictive licenses which must be honored.

To Reproduce

sc_issue_ethmac_job0_ihp130_sg13g2_stdcell_place.global0_20250206-204504.tar.gz

tar xvf sc_issue_ethmac_job0_ihp130_sg13g2_stdcell_place.global0_20250206-204504.tar.gz
cd sc_issue_ethmac_job0_ihp130_sg13g2_stdcell_place.global0_20250206-204504
./run.sh

Relevant log output

[INFO GPL-0075] Routability iteration: 1
[INFO GPL-0036] TileBBox: (    0    0 ) ( 7200 7200 ) DBU
[INFO GPL-0038] TileCnt:     114  114
[INFO GPL-0040] NumTiles: 12996
[INFO GPL-0081] TotalRouteOverflow: 15.9425
[INFO GPL-0082] OverflowTileCnt: 829
[INFO GPL-0083] 0.5%RC: 1.0909
[INFO GPL-0084] 1.0%RC: 1.0740
[INFO GPL-0085] 2.0%RC: 1.0508
[INFO GPL-0086] 5.0%RC: 1.0244
[INFO GPL-0087] FinalRC: 1.0824358
[INFO GPL-0078] FinalRC lower than minRC (1000000015047466219876688855040.0000), min RC updated.
[INFO GPL-0045] InflatedAreaDelta:        5.775 um^2 (+0.00%)
[INFO GPL-0046] TargetDensity:            0.650
[INFO GPL-0049] WhiteSpaceArea:      582785.280 um^2
[INFO GPL-0050] NesterovInstsArea:   189436.061 um^2
[INFO GPL-0051] TotalFillerArea:     189374.373 um^2
[INFO GPL-0052] TotalGCellsArea:     378810.434 um^2
[INFO GPL-0053] ExpectedGCellsArea:  378816.208 um^2
[INFO GPL-0054] NewTargetDensity:         0.650
[INFO GPL-0055] NewWhiteSpaceArea:   582785.280 um^2
[INFO GPL-0056] MovableArea:         378816.201 um^2
[INFO GPL-0057] NewNesterovInstArea: 189441.836 um^2
[INFO GPL-0058] NewTotalFillerArea:  189374.365 um^2
[INFO GPL-0059] NewTotalGCellsArea:  378816.201 um^2
[INFO GPL-0089] Routability: revert back to snapshot

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Additional Context

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@gadfort gadfort added the gpl Global Placement label Feb 7, 2025
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