Fix periodic parallel preprocessing

Common/src/geometry/CGeometry.cpp

@@ -792,15 +792,20 @@ void CGeometry::PreprocessPeriodicComms(CGeometry* geometry, CConfig* config) {
   nPoint_Send_All[0] = 0;
   int* nPoint_Recv_All = new int[size + 1];
   nPoint_Recv_All[0] = 0;
-  int* nPoint_Flag = new int[size];
 
-  for (iRank = 0; iRank < size; iRank++) {
-    nPoint_Send_All[iRank] = 0;
-    nPoint_Recv_All[iRank] = 0;
-    nPoint_Flag[iRank] = -1;
-  }
-  nPoint_Send_All[size] = 0;
-  nPoint_Recv_All[size] = 0;
+  /*--- Store a set of unique (point, marker) pairs per destination rank. ---*/
+  using PointMarkerPair = std::pair<unsigned long, unsigned long>;
+
+  auto pairHash = [](const PointMarkerPair& p) -> std::size_t {
+    // Use the golden ratio constant and bit mixing to generate pair hash
+    std::size_t h1 = std::hash<unsigned long>{}(p.first);
+    std::size_t h2 = std::hash<unsigned long>{}(p.second);
+
+    return h1 ^ (h2 + 0x9e3779b9 + (h1 << 6) + (h1 >> 2));
+  };
+
+  using PointMarkerSet = std::unordered_set<PointMarkerPair, decltype(pairHash)>;
+  std::vector<PointMarkerSet> Points_Send_All(size, PointMarkerSet(0, pairHash));
 
   /*--- Loop through all of our periodic markers and track
    our sends with each rank. ---*/
@@ -821,19 +826,17 @@ void CGeometry::PreprocessPeriodicComms(CGeometry* geometry, CConfig* config) {
 
           iRank = static_cast<int>(geometry->vertex[iMarker][iVertex]->GetDonorProcessor());
 
-          /*--- If we have not visited this point last, increment our
-           number of points that must be sent to a particular proc. ---*/
-
-          if ((nPoint_Flag[iRank] != static_cast<int>(iPoint))) {
-            nPoint_Flag[iRank] = static_cast<int>(iPoint);
-            nPoint_Send_All[iRank + 1] += 1;
-          }
+          /*--- Store the (point, marker) pair in the set for the destination rank. ---*/
+          Points_Send_All[iRank].insert(std::make_pair(iPoint, static_cast<unsigned long>(iMarker)));
         }
       }
     }
   }
 
-  delete[] nPoint_Flag;
+  for (iRank = 0; iRank < size; iRank++) {
+    nPoint_Send_All[iRank + 1] = Points_Send_All[iRank].size();
+    nPoint_Recv_All[iRank + 1] = 0;
+  }
 
   /*--- Communicate the number of points to be sent/recv'd amongst
    all processors. After this communication, each proc knows how
@@ -943,11 +946,15 @@ void CGeometry::PreprocessPeriodicComms(CGeometry* geometry, CConfig* config) {
   auto* idSend = new unsigned long[nPoint_PeriodicSend[nPeriodicSend] * nPackets];
   for (iSend = 0; iSend < nPoint_PeriodicSend[nPeriodicSend] * nPackets; iSend++) idSend[iSend] = 0;
 
+  /*--- Re-use set of unique points per destination rank. ---*/
+  for (iRank = 0; iRank < size; iRank++) Points_Send_All[iRank].clear();
+
   /*--- Build the lists of local index and periodic marker index values. ---*/
 
   ii = 0;
   jj = 0;
   for (iSend = 0; iSend < nPeriodicSend; iSend++) {
+    int destRank = Neighbors_PeriodicSend[iSend];
     for (iMarker = 0; iMarker < config->GetnMarker_All(); iMarker++) {
       if (config->GetMarker_All_KindBC(iMarker) == PERIODIC_BOUNDARY) {
         iPeriodic = config->GetMarker_All_PerBound(iMarker);
@@ -969,14 +976,21 @@ void CGeometry::PreprocessPeriodicComms(CGeometry* geometry, CConfig* config) {
              index on the matching periodic point and the periodic marker
              index to be communicated to the recv rank. ---*/
 
-            if (iRank == Neighbors_PeriodicSend[iSend]) {
-              Local_Point_PeriodicSend[ii] = iPoint;
-              Local_Marker_PeriodicSend[ii] = static_cast<unsigned long>(iMarker);
-              jj = ii * nPackets;
-              idSend[jj] = geometry->vertex[iMarker][iVertex]->GetDonorPoint();
-              jj++;
-              idSend[jj] = static_cast<unsigned long>(iPeriodic);
-              ii++;
+            if (iRank == destRank) {
+              /*--- Check if we have already added this (point, marker) pair
+               for this destination rank. Use the result if insert(), which is
+               a pair whose second element is success. ---*/
+              const auto pointMarkerPair = std::make_pair(iPoint, static_cast<unsigned long>(iMarker));
+              const auto insertResult = Points_Send_All[destRank].insert(pointMarkerPair);
+              if (insertResult.second) {
+                Local_Point_PeriodicSend[ii] = iPoint;
+                Local_Marker_PeriodicSend[ii] = static_cast<unsigned long>(iMarker);
+                jj = ii * nPackets;
+                idSend[jj] = geometry->vertex[iMarker][iVertex]->GetDonorPoint();
+                jj++;
+                idSend[jj] = static_cast<unsigned long>(iPeriodic);
+                ii++;
+              }
             }
           }
         }

TestCases/mms/fvm_euler/inv_mms_vortex.cfg

@@ -0,0 +1,89 @@
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%                                                                              %
+% SU2 configuration file                                                       %
+% Case description: Isentropic vortex (FVM)                                    %
+% Author: Brian Munguía                                                        %
+% Date: 2025.25.06                                                             %
+% File Version 8.2.0 "Harrier"                                                 %
+%                                                                              %
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+% ------------- DIRECT, ADJOINT, AND LINEARIZED PROBLEM DEFINITION ------------%
+%
+KIND_VERIFICATION_SOLUTION= INVISCID_VORTEX
+SOLVER= EULER
+MATH_PROBLEM= DIRECT
+RESTART_SOL= NO
+
+% ----------- COMPRESSIBLE AND INCOMPRESSIBLE FREE-STREAM DEFINITION ----------%
+%
+MACH_NUMBER= 0.5
+AOA= 45.0
+FREESTREAM_DENSITY= 1.0
+FREESTREAM_PRESSURE= 1.0
+FREESTREAM_TEMPERATURE= 1.0
+
+% -------------- COMPRESSIBLE AND INCOMPRESSIBLE FLUID CONSTANTS --------------%
+%
+FLUID_MODEL= IDEAL_GAS
+GAMMA_VALUE= 1.4
+GAS_CONSTANT= 1.0
+
+% ---------------------- REFERENCE VALUE DEFINITION ---------------------------%
+%
+REF_ORIGIN_MOMENT_X= 0.00
+REF_ORIGIN_MOMENT_Y= 0.00
+REF_ORIGIN_MOMENT_Z= 0.00
+REF_AREA= 1.0
+REF_DIMENSIONALIZATION= DIMENSIONAL
+
+% ------------------------- UNSTEADY SIMULATION -------------------------------%
+%
+TIME_DOMAIN= YES
+TIME_MARCHING= TIME_STEPPING
+TIME_STEP= 2.0e-3
+MAX_TIME= 50.0
+
+% -------------------- BOUNDARY CONDITION DEFINITION --------------------------%
+%
+MARKER_PERIODIC= ( PeriodicBottom, PeriodicTop, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 2.0, 0.0, \
+                   PeriodicLeft, PeriodicRight, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 2.0, 0.0, 0.0 )
+
+% ------------- COMMON PARAMETERS TO DEFINE THE NUMERICAL METHOD --------------%
+%
+CFL_NUMBER= 0.2
+TIME_ITER= 50
+RK_ALPHA_COEFF= ( 0.666667, 0.666667, 1.0 )
+
+% ------------------ FLOW NUMERICAL METHOD DEFINITION ----------------------%
+%
+CONV_NUM_METHOD_FLOW= ROE
+MUSCL_FLOW= YES
+SLOPE_LIMITER_FLOW= NONE
+TIME_DISCRE_FLOW= EULER_IMPLICIT
+
+% --------------------------- CONVERGENCE PARAMETERS --------------------------%
+%
+CONV_RESIDUAL_MINVAL= -15
+CONV_STARTITER= 10
+CONV_CAUCHY_ELEMS= 100
+CONV_CAUCHY_EPS= 1E-6
+
+% ------------------------- INPUT/OUTPUT INFORMATION --------------------------%
+%
+MESH_FILENAME= TriAdapt.su2
+MESH_FORMAT= SU2
+MESH_OUT_FILENAME= mesh_out.su2
+SOLUTION_FILENAME= solution_flow.dat
+SOLUTION_ADJ_FILENAME= solution_adj.dat
+TABULAR_FORMAT= CSV
+CONV_FILENAME= history
+RESTART_FILENAME= restart_flow.dat
+RESTART_ADJ_FILENAME= restart_adj.dat
+VOLUME_FILENAME= flow
+VOLUME_ADJ_FILENAME= adjoint
+GRAD_OBJFUNC_FILENAME= of_grad.dat
+SURFACE_FILENAME= surface_flow
+SURFACE_ADJ_FILENAME= surface_adjoint
+OUTPUT_WRT_FREQ= 50
+SCREEN_OUTPUT= (TIME_ITER, RMS_DENSITY, RMS_ENERGY, LIFT, DRAG)

TestCases/parallel_regression.py

@@ -1479,6 +1479,15 @@ def main():
     ### Method of Manufactured Solutions (MMS) ###
     ##############################################
 
+    # FVM, compressible, euler (periodic isentropic vortex)
+    mms_fvm_vortex           = TestCase('mms_fvm_vortex')
+    mms_fvm_vortex.cfg_dir   = "mms/fvm_euler"
+    mms_fvm_vortex.cfg_file  = "inv_mms_vortex.cfg"
+    mms_fvm_vortex.test_iter = 10
+    mms_fvm_vortex.test_vals = [-5.704300, -4.848072, 0.000000, 0.000000]
+    mms_fvm_vortex.unsteady  = True
+    test_list.append(mms_fvm_vortex)
+
     # FVM, compressible, laminar N-S
     mms_fvm_ns           = TestCase('mms_fvm_ns')
     mms_fvm_ns.cfg_dir   = "mms/fvm_navierstokes"

TestCases/serial_regression.py

@@ -1129,6 +1129,15 @@ def main():
     ### Method of Manufactured Solutions (MMS) ###
     ##############################################
 
+    # FVM, compressible, euler (periodic isentropic vortex)
+    mms_fvm_vortex           = TestCase('mms_fvm_vortex')
+    mms_fvm_vortex.cfg_dir   = "mms/fvm_euler"
+    mms_fvm_vortex.cfg_file  = "inv_mms_vortex.cfg"
+    mms_fvm_vortex.test_iter = 10
+    mms_fvm_vortex.test_vals = [-5.704300, -4.848072, 0.000000, 0.000000]
+    mms_fvm_vortex.unsteady  = True
+    test_list.append(mms_fvm_vortex)
+
     # FVM, compressible, laminar N-S
     mms_fvm_ns           = TestCase('mms_fvm_ns')
     mms_fvm_ns.cfg_dir   = "mms/fvm_navierstokes"