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Set LogToConsole instead of OutputFlag to handle "tee" #3716

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Set LogToConsole instead of OutputFlag to handle "tee" #3716

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Set LogToConsole instead of OutputFlag to handle "tee"
rschwarz Sep 3, 2025
a8b7a11
Merge branch 'main' into rs/3589-gurobi-direct-logtoconsole
jsiirola Sep 3, 2025
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4 changes: 2 additions & 2 deletions pyomo/solvers/plugins/solvers/gurobi_direct.py
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Original file line number Diff line number Diff line change
Expand Up @@ -240,9 +240,9 @@ def _apply_solver(self):
StaleFlagManager.mark_all_as_stale()

if self._tee:
self._solver_model.setParam('OutputFlag', 1)
self._solver_model.setParam('LogToConsole', 1)
else:
self._solver_model.setParam('OutputFlag', 0)
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Why should this be the new default ? It seems that what you want can be achieved by adding LogToConsole=1 to the params you pass in the inputs

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@rschwarz rschwarz Sep 3, 2025 •
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No, I actually want (in this case) LogToConsole=0, which is implied by OutputFlag=0, but the latter also disables writing to log files.

But I want to be able to have all 4 combinations of console and log files for different use cases.

My understand was that the tee option refers to what is shown on the console, so it should not interfere with log files, which OutputFlag does.

self._solver_model.setParam('LogToConsole', 0)

if self._keepfiles:
# Only save log file when the user wants to keep it.
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4 changes: 2 additions & 2 deletions pyomo/solvers/tests/checks/test_gurobi_direct.py
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Expand Up @@ -134,9 +134,9 @@ def setParam(self, param, value):
opt.solve(self.model, options={"MIPFocus": 2})

# Method should not be set again, but MIPFocus was changed.
# OutputFlag is explicitly set on the model.
# LogToConsole is explicitly set on the model.
assert envparams == {"Method": 2, "MIPFocus": 1}
assert modelparams == {"MIPFocus": 2, "OutputFlag": 0}
assert modelparams == {"MIPFocus": 2, "LogToConsole": 0}

# Try an erroneous parameter setting to ensure parameters go through in all
# cases. Expect an error to indicate pyomo tried to set the parameter.
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