changed default stall tolerance

openmdao/solvers/solver.py

@@ -531,7 +531,7 @@ def _declare_options(self):
                                   'identical within the stall_tol, then terminate as if max '
                                   'iterations were reached. Default is 0, which disables this '
                                   'feature.')
-        self.options.declare('stall_tol', default=1e-6,
+        self.options.declare('stall_tol', default=1e-12,
                              desc='When stall checking is enabled, the threshold below which the '
                                   'residual norm is considered unchanged.')
 

openmdao/solvers/tests/test_solver_features.py

@@ -72,7 +72,7 @@ def test_nonlinear_solver_stall_detection(self):
         newton = prob.model.nonlinear_solver = om.NewtonSolver()
         newton.options['solve_subsystems'] = True
         newton.options['stall_limit'] = 3
-        newton.options['stall_tol'] = 1e-6
+        newton.options['stall_tol'] = 1e-8
         newton.options['maxiter'] = 100
         newton.options['err_on_non_converge'] = True
 
@@ -100,7 +100,7 @@ def test_feature_stall_detection_newton(self):
         newton = prob.model.nonlinear_solver = om.NewtonSolver()
         newton.options['solve_subsystems'] = True
         newton.options['stall_limit'] = 3
-        newton.options['stall_tol'] = 1e-6
+        newton.options['stall_tol'] = 1e-8
         newton.options['maxiter'] = 100
 
         prob.model.linear_solver = om.DirectSolver()
@@ -123,7 +123,7 @@ def test_feature_stall_detection_broyden(self):
 
         nl_solver = prob.model.nonlinear_solver = om.BroydenSolver()
         nl_solver.options['stall_limit'] = 3
-        nl_solver.options['stall_tol'] = 1e-6
+        nl_solver.options['stall_tol'] = 1e-8
         nl_solver.options['maxiter'] = 100
 
         prob.model.linear_solver = om.DirectSolver()