2_4_floorplan_pdn hash is fickle

[oharboe]

Describe the bug

I have seen differences in hashes even with same build procedure, see below, so I'm inclined to believe this has nothing to do with Bazel or CMake as such.

However, the simplest way to reproduce the problem, that PDN .odb is different for same version of OpenROAD, is to use a CMake and a bazel built OpenROAD.

Reproduction case, untar and run pdn_MockArray_asap7_base_2025-07-08_10-18.tar.gz

The exact hash will vary with OpenROAD commit used, I recommend testing on origin/master.

Put bazelisk build -c opt :openroad in path, then to display hash:

$ sha1sum test/orfs/mock-array/results/asap7/MockArray/base/2_4_floorplan_pdn.odb 
3e006640e8c1afb7923e5893c47680c2183b3625  test/orfs/mock-array/results/asap7/MockArray/base/2_4_floorplan_pdn.odb

CMake built and rerunning, I get a different result:

$ sha1sum test/orfs/mock-array/results/asap7/MockArray/base/2_4_floorplan_pdn.odb 
08845d99c628061720edf69a128de6f2606de400  test/orfs/mock-array/results/asap7/MockArray/base/2_4_floorplan_pdn.odb

The testcase above was created by:

$ bazelisk run test/orfs/mock-array:MockArray_floorplan_deps /tmp/pdn
$ /tmp/pdn/make do-floorplan
$ /tmp/pdn/make pdn_issue

I discovered this when there was a difference between CI and local builds PDN .odb files.

Hashes locally for #7722:

$ bazelisk test test/orsf/mock-array:MockArray_test
[deleted]
$ grep -h -r "Elapsed/s" -A1 bazel-bin/test/orfs/mock-array/logs/asap7/MockArray/base/*.log | grep -v "Elapsed/s" | grep -v "^--$"
2_1_floorplan                      1            208 40097d51797c6c473b09
2_2_floorplan_macro                3            188 e3184139724d8d72b5bc
2_3_floorplan_tapcell              1            166 717531cdace8f3c5254c
2_4_floorplan_pdn                 63           4102 3e006640e8c1afb7923e
3_1_place_gp_skip_io               5            228 0115c95b13660ab5b33a
3_2_place_iop                      1            184 6611bceadd4dda49af52
3_3_place_gp                      17            843 44b0ce0abd8e3e4e10e5
3_4_place_resized                  3            243 44b0ce0abd8e3e4e10e5
3_5_place_dp                       5            889 e0f0f3fa9b743840b9f5
4_1_cts                            6            902 df5920d204fe4f71395f
5_1_grt                           14           1656 cf605726892fcd8e5e37
5_2_route                        447           4717 79a1a97a3bcf860c8930
5_3_fillcell                       2            873 b4b5eba5f05bdd75f29c
6_report                           5            324                  N/A

From #7722 and the output on the CI https://jenkins.openroad.tools/job/OpenROAD-Public/job/PR-7722-head/7/pipeline-overview/?selected-node=59

[2025-07-08T07:22:31.008Z] Elapsed time: 0:02.53[h:]min:sec. CPU time: user 2.38 sys 0.14 (99%). Peak memory: 171096KB.
[2025-07-08T07:22:31.008Z] Log                        Elapsed/s Peak Memory/MB  sha1sum .odb [0:20)
[2025-07-08T07:22:31.008Z] 2_3_floorplan_tapcell              2            167 717531cdace8f3c5254c
[2025-07-08T07:22:31.008Z] external/bazel-orfs++orfs_repositories+docker_orfs/OpenROAD-flow-scripts/flow/scripts/flow.sh 2_4_floorplan_pdn pdn
[2025-07-08T07:22:31.008Z] Running pdn.tcl, stage 2_4_floorplan_pdn
[2025-07-08T07:22:31.008Z] source external/bazel-orfs++orfs_repositories+docker_orfs/OpenROAD-flow-scripts/flow/platforms/asap7/liberty_suppressions.tcl
[2025-07-08T07:22:31.009Z] suppress_message STA 1212
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: top
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_0_0
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_0_1
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_0_2
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_0_3
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_0_4
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_0_5
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_0_6
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_0_7
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_1_0
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_1_1
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_1_2
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_1_3
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_1_4
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_1_5
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_1_6
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_1_7
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_2_0
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_2_1
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_2_2
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_2_3
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_2_4
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_2_5
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_2_6
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_2_7
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_3_0
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_3_1
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_3_2
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_3_3
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_3_4
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_3_5
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_3_6
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_3_7
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_4_0
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_4_1
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_4_2
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_4_3
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_4_4
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_4_5
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_4_6
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_4_7
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_5_0
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_5_1
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_5_2
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_5_3
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_5_4
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_5_5
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_5_6
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_5_7
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_6_0
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_6_1
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_6_2
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_6_3
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_6_4
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_6_5
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_6_6
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_6_7
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_7_0
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_7_1
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_7_2
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_7_3
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_7_4
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_7_5
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_7_6
[2025-07-08T07:22:31.009Z] [INFO PDN-0001] Inserting grid: ElementGrid - ces_7_7
[2025-07-08T07:22:31.009Z] Elapsed time: 3:45.63[h:]min:sec. CPU time: user 218.85 sys 6.70 (99%). Peak memory: 4198992KB.
[2025-07-08T07:22:31.009Z] Log                        Elapsed/s Peak Memory/MB  sha1sum .odb [0:20)
[2025-07-08T07:22:31.009Z] 2_4_floorplan_pdn                225           4100 4d53f67594daf3078698

Expected Behavior

Same result always

Environment

v2.0-22706-g9c4e436fd2

To Reproduce

See above

Relevant log output

Screenshots

No response

Additional Context

No response

[maliberty]

I was able to reproduce this with OR commit 10ae116. @gadfort do you want to look at this?

[maliberty]

Note that if I write a DEF from each db the results are identical. It must be the order of elements that varies in the odb.

[gadfort]

@maliberty I probably don't, at least not to triage the issue (once an issue has been identified), then I can taken a look, if changes are needed in pdn for this.