FEM: Add property to disable PaStiX mixed precision for the ccx solver (#23539)

* FEM: Update solver_calculix.py

* FEM: Update solver.py

* FEM: Update calculixtools.py

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* FEM: Update calculixtools.py

* FEM: Update task_solver_ccxtools.py

* FEM: Update task_solver_ccxtools.py

* FEM: Update solver_calculix.py

* FEM: Update solver.py

* FEM: Update calculixtools.py

* FEM: Update task_solver_ccxtools.py

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

src/Mod/Fem/femobjects/solver_calculix.py

@@ -330,6 +330,15 @@ class SolverCalculiX(base_fempythonobject.BaseFemPythonObject):
                 value=False,
             )
         )
+        prop.append(
+            _PropHelper(
+                type="App::PropertyBool",
+                name="PastixMixedPrecision",
+                group="Solver",
+                doc="Mixed precision for the PaStiX matrix solver",
+                value=False,
+            )
+        )
         return prop
 
     def onDocumentRestored(self, obj):

src/Mod/Fem/femsolver/calculix/calculixtools.py

@@ -116,6 +116,8 @@ class CalculiXTools:
             "AnalysisNumCPUs", QThread.idealThreadCount()
         )
         env.insert("OMP_NUM_THREADS", str(num_cpu))
+        pastix_prec = "1" if self.obj.PastixMixedPrecision else "0"
+        env.insert("PASTIX_MIXED_PRECISION", pastix_prec)
         self.process.setProcessEnvironment(env)
         self.process.setWorkingDirectory(self.obj.WorkingDirectory)
 

src/Mod/Fem/femsolver/calculix/solver.py

@@ -433,6 +433,16 @@ class _BaseSolverCalculix:
             )
             obj.ExcludeBendingStiffness = False
 
+        if not hasattr(obj, "PastixMixedPrecision"):
+            obj.addProperty(
+                "App::PropertyBool",
+                "PastixMixedPrecision",
+                "Fem",
+                "Mixed precision for the PaStiX matrix solver",
+                locked=True,
+            )
+            obj.PastixMixedPrecision = False
+
 
 class Proxy(solverbase.Proxy, _BaseSolverCalculix):
     """The Fem::FemSolver's Proxy python type, add solver specific properties"""

src/Mod/Fem/femtaskpanels/task_solver_ccxtools.py

@@ -383,6 +383,8 @@ class _TaskPanel:
             env = QtCore.QProcessEnvironment.systemEnvironment()
             num_cpu_pref = ccx_prefs.GetInt("AnalysisNumCPUs", QtCore.QThread.idealThreadCount())
             env.insert("OMP_NUM_THREADS", str(num_cpu_pref))
+            pastix_prec = "1" if self.fea.solver.PastixMixedPrecision else "0"
+            env.insert("PASTIX_MIXED_PRECISION", pastix_prec)
             self.Calculix.setProcessEnvironment(env)
 
             self.cwd = QtCore.QDir.currentPath()