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<https://github.com/The-OpenROAD-Project/OpenLane/issues/1590|#1590 Two builds started in the same minute interfere>
Issue created by <https://github.com/xobs|xobs>
*Description*

Design hardening is a process that takes a lot of time and is a very linear process. Developers who want to run experiments need to wait for the design to finish in order to read the results of an experiment.

It is possible to run multiple experiments at once by simply opening up multiple terminals. This allows the developer to start a build, make a change, then start a second build. An example of this might be to build a design for both SKY130 and GF180 at the same time.

However, builds started within one minute of one another run the risk of using the same output directory, resulting in confusing error messages.

*Expected Behavior*

Builds should never be able to share the same output directory.

*Environment report*

```
Kernel: Linux v5.15.79.1-microsoft-standard-WSL2
Distribution: ubuntu 22.04
Python: v3.10.6 (OK)
Container Engine: docker v20.10.21 (OK)
OpenLane Git Version: cb59d1f84deb5cedbb5b0a3e3f3b4129a967c988
pip: INSTALLED
python-venv: INSTALLED
---
PDK Version Verification Status: OK
---
Git Log (Last 3 Commits)

cb59d1f 2022-11-18T18:42:38+02:00 fix return values in `equally_spaced_sequence` (#1503) - Kareem Farid -  (grafted, HEAD, tag: 2022.11.19)
---
Git Remotes

origin  git@github.com:The-OpenROAD-Project/OpenLane (fetch)
origin  git@github.com:The-OpenROAD-Project/OpenLane (push)
```

*Reproduction material*

This should occur with any design where synthesis takes enough time to be able to go into another window and run a second build.

*Relevant log output*

```
[ERROR]: during executing openroad script /openlane/scripts/openroad/floorplan.tcl
[ERROR]: Log: ../si/work/caravel-gf180-pio/openlane/wb_pio/runs/22_12_23_15_56/logs/floorplan/3-initial_fp.log
[ERROR]: Last 10 lines:
[WARNING ORD-1013] instance _17949_ LEF master sky130_fd_sc_hd__conb_1 not found.
[INFO]: Setting output delay to: 2.4000000000000004
[INFO]: Setting input delay to: 2.4000000000000004
[INFO]: Setting load to: 0.033442
[INFO]: Setting clock uncertainty to: 0.25
[INFO]: Setting clock transition to: 0.15
[INFO]: Setting timing derate to: 0.5 %
[WARNING IFP-0009] SITE unithd not found.
Error: floorplan.tcl, 70 TypeError in method 'insert_tiecells_cmd', argument 1 of type 'odb::dbMTerm *'
child process exited abnormally
```
<https://github.com/The-OpenROAD-Project/OpenLane|The-OpenROAD-Project/OpenLane>