Speeding up deltaDebug.py

[oharboe]

As a general strategy, would it make sense to exhaust the current level of detail when a failure is found, rather than start bisecting at the top?

It found something to chop away here:

Reading base odb file
Insts level debugging
Number of Insts 913
Number of Nets 119228
Number of elements to be cut is 57, [############C###]
Done cutting design.
Writing odb file
Step 57 is running, deltaDebug is waiting.
Timeout updated to approx 2 minutes!
Error Code found: [ERROR GRT-0119] Routing congestion too high.
Step 57 is done.

Then it started bisecting at the top again, before finally finding something to chop away here.

So all that chopping away from the top was wasted, in this case.

Reading base odb file
Insts level debugging
Number of Insts 856
Number of Nets 119228
Number of elements to be cut is 26, [###############C################]
Done cutting design.
Writing odb file
Step 103 is running, deltaDebug is waiting.
Timeout updated to approx 2 minutes!
Error Code found: [ERROR GRT-0119] Routing congestion too high.
Step 103 is done.

[maliberty]

Its hard to give a general answer as to what will work better. Most likely it is test case specific. Feel free to try and see.