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[Depends on #3762] Fix KNITRO tee #3765

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[Depends on #3762] Fix KNITRO tee #3765

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5f92461
fix tee for KNITRO solver
eminyouskn Oct 20, 2025
d6eeb27
Merge branch 'main' into knitro-tee
eminyouskn Oct 20, 2025
f45f316
add tests
eminyouskn Oct 21, 2025
6c75524
Merge knitro improvements..
eminyouskn Oct 21, 2025
e5ad284
Merge branch 'main' into knitro-tee
jsiirola Oct 28, 2025
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2 changes: 1 addition & 1 deletion pyomo/contrib/solver/solvers/knitro/base.py
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Original file line number Diff line number Diff line change
Expand Up @@ -82,7 +82,7 @@ def solve(self, model: BlockData, **kwds) -> Results:
if config.restore_variable_values_after_solve:
self._save_var_values()

with capture_output(TeeStream(self._stream, *config.tee), capture_fd=False):
with capture_output(TeeStream(self._stream, *config.tee), capture_fd=True):
self._solve(config, timer)

if config.restore_variable_values_after_solve:
Expand Down
29 changes: 29 additions & 0 deletions pyomo/contrib/solver/tests/solvers/test_knitro_direct.py
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Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,9 @@
# This software is distributed under the 3-clause BSD License.
# ___________________________________________________________________________

import io
from contextlib import redirect_stdout

import pyomo.common.unittest as unittest

from pyomo.contrib.solver.solvers.knitro.config import KnitroConfig
Expand Down Expand Up @@ -87,6 +90,32 @@ class TestKnitroDirectSolver(unittest.TestCase):
def setUp(self):
self.opt = KnitroDirectSolver()

def test_solve_tee(self):
m = pyo.ConcreteModel()
m.x = pyo.Var(initialize=1.5, bounds=(-5, 5))
m.y = pyo.Var(initialize=1.5, bounds=(-5, 5))
m.obj = pyo.Objective(
expr=(1.0 - m.x) + 100.0 * (m.y - m.x), sense=pyo.minimize
)
stream = io.StringIO()
with redirect_stdout(stream):
self.opt.solve(m, tee=True)
output = stream.getvalue()
self.assertTrue(bool(output.strip()))

def test_solve_no_tee(self):
m = pyo.ConcreteModel()
m.x = pyo.Var(initialize=1.5, bounds=(-5, 5))
m.y = pyo.Var(initialize=1.5, bounds=(-5, 5))
m.obj = pyo.Objective(
expr=(1.0 - m.x) + 100.0 * (m.y - m.x), sense=pyo.minimize
)
stream = io.StringIO()
with redirect_stdout(stream):
self.opt.solve(m, tee=False)
output = stream.getvalue()
self.assertFalse(bool(output.strip()))

def test_solve(self):
m = pyo.ConcreteModel()
m.x = pyo.Var(initialize=1.5, bounds=(-5, 5))
Expand Down
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