tests - add sequential composite operator test

Author: zatkins-dev

tests/t599-operator.c

@@ -0,0 +1,143 @@
+/// @file
+/// Test creation, action, and destruction for mass matrix operator at points using sequential composite operator
+/// \test Test creation, action, and destruction for mass matrix operator at points using sequential composite operator
+#include "t599-operator.h"
+
+#include <ceed.h>
+#include <math.h>
+#include <stdio.h>
+
+int main(int argc, char **argv) {
+  Ceed    ceed;
+  CeedInt num_elem_1d = 3, num_elem = num_elem_1d * num_elem_1d, dim = 2, p = 3, q = 5;
+  CeedInt num_nodes = (num_elem_1d * (p - 1) + 1) * (num_elem_1d * (p - 1) + 1), num_points_per_elem = 4, num_points = num_elem * num_points_per_elem;
+  CeedVector          x_points, u, v, u_points;
+  CeedElemRestriction elem_restriction_x_points, elem_restriction_u_points, elem_restriction_u;
+  CeedBasis           basis_u;
+  CeedQFunction       qf_to_points, qf_from_points;
+  CeedOperator        op_to_points, op_from_points, op_mass;
+  bool                is_at_points;
+
+  CeedInit(argv[1], &ceed);
+
+  CeedVectorCreate(ceed, dim * num_points, &x_points);
+  {
+    CeedScalar x_array[dim * num_points];
+
+    for (CeedInt e = 0; e < num_elem; e++) {
+      for (CeedInt d = 0; d < dim; d++) {
+        x_array[num_points_per_elem * (e * dim + d) + 0] = 0.25;
+        x_array[num_points_per_elem * (e * dim + d) + 1] = d == 0 ? -0.25 : 0.25;
+        x_array[num_points_per_elem * (e * dim + d) + 2] = d == 0 ? 0.25 : -0.25;
+        x_array[num_points_per_elem * (e * dim + d) + 3] = 0.25;
+      }
+    }
+    CeedVectorSetArray(x_points, CEED_MEM_HOST, CEED_COPY_VALUES, x_array);
+  }
+  {
+    CeedInt ind_x[num_elem + 1 + num_points];
+
+    for (CeedInt i = 0; i <= num_elem; i++) ind_x[i] = num_elem + 1 + i * num_points_per_elem;
+    for (CeedInt i = 0; i < num_points; i++) ind_x[num_elem + 1 + i] = i;
+    CeedElemRestrictionCreateAtPoints(ceed, num_elem, num_points, dim, num_points * dim, CEED_MEM_HOST, CEED_COPY_VALUES, ind_x,
+                                      &elem_restriction_x_points);
+    CeedElemRestrictionCreateAtPoints(ceed, num_elem, num_points, 1, num_points, CEED_MEM_HOST, CEED_COPY_VALUES, ind_x, &elem_restriction_u_points);
+    CeedElemRestrictionCreateVector(elem_restriction_u_points, &u_points, NULL);
+    CeedVectorSetValue(u_points, 0);
+  }
+
+  {
+    CeedInt ind_u[num_elem * p * p];
+
+    for (CeedInt e = 0; e < num_elem; e++) {
+      CeedInt elem_xy[2] = {1, 1}, n_d[2] = {0, 0};
+
+      for (CeedInt d = 0; d < dim; d++) n_d[d] = num_elem_1d * (p - 1) + 1;
+      {
+        CeedInt r_e = e;
+
+        for (CeedInt d = 0; d < dim; d++) {
+          elem_xy[d] = r_e % num_elem_1d;
+          r_e /= num_elem_1d;
+        }
+      }
+      CeedInt num_nodes_in_elem = p * p, *elem_nodes = ind_u + e * num_nodes_in_elem;
+
+      for (CeedInt n = 0; n < num_nodes_in_elem; n++) {
+        CeedInt g_node = 0, g_node_stride = 1, r_node = n;
+
+        for (CeedInt d = 0; d < dim; d++) {
+          g_node += (elem_xy[d] * (p - 1) + r_node % p) * g_node_stride;
+          g_node_stride *= n_d[d];
+          r_node /= p;
+        }
+        elem_nodes[n] = g_node;
+      }
+    }
+    CeedElemRestrictionCreate(ceed, num_elem, p * p, 1, 1, num_nodes, CEED_MEM_HOST, CEED_COPY_VALUES, ind_u, &elem_restriction_u);
+  }
+  CeedBasisCreateTensorH1Lagrange(ceed, dim, 1, p, q, CEED_GAUSS, &basis_u);
+
+  CeedQFunctionCreateInterior(ceed, 1, mass, mass_loc, &qf_to_points);
+  CeedQFunctionAddInput(qf_to_points, "u", 1, CEED_EVAL_INTERP);
+  CeedQFunctionAddOutput(qf_to_points, "u_points", 1, CEED_EVAL_NONE);
+
+  CeedOperatorCreateAtPoints(ceed, qf_to_points, CEED_QFUNCTION_NONE, CEED_QFUNCTION_NONE, &op_to_points);
+  CeedOperatorSetField(op_to_points, "u", elem_restriction_u, basis_u, CEED_VECTOR_ACTIVE);
+  CeedOperatorSetField(op_to_points, "u_points", elem_restriction_u_points, CEED_BASIS_NONE, u_points);
+  CeedOperatorAtPointsSetPoints(op_to_points, elem_restriction_x_points, x_points);
+
+  CeedOperatorIsAtPoints(op_to_points, &is_at_points);
+  if (!is_at_points) printf("Error: Operator should be at points\n");
+
+  CeedQFunctionCreateInterior(ceed, 1, mass, mass_loc, &qf_from_points);
+  CeedQFunctionAddInput(qf_from_points, "u_points", 1, CEED_EVAL_NONE);
+  CeedQFunctionAddOutput(qf_from_points, "v", 1, CEED_EVAL_INTERP);
+
+  CeedOperatorCreateAtPoints(ceed, qf_from_points, CEED_QFUNCTION_NONE, CEED_QFUNCTION_NONE, &op_from_points);
+  CeedOperatorSetField(op_from_points, "u_points", elem_restriction_u_points, CEED_BASIS_NONE, u_points);
+  CeedOperatorSetField(op_from_points, "v", elem_restriction_u, basis_u, CEED_VECTOR_ACTIVE);
+  CeedOperatorAtPointsSetPoints(op_from_points, elem_restriction_x_points, x_points);
+
+  CeedOperatorIsAtPoints(op_from_points, &is_at_points);
+  if (!is_at_points) printf("Error: Operator should be at points\n");
+
+  CeedOperatorCreateComposite(ceed, &op_mass);
+  CeedOperatorCompositeSetSequential(op_mass, true);
+  CeedOperatorCompositeAddSub(op_mass, op_to_points);
+  CeedOperatorCompositeAddSub(op_mass, op_from_points);
+
+  CeedVectorCreate(ceed, num_nodes, &u);
+  CeedVectorSetValue(u, 1.0);
+  CeedVectorCreate(ceed, num_nodes, &v);
+  CeedOperatorApply(op_mass, u, v, CEED_REQUEST_IMMEDIATE);
+
+  {
+    CeedScalar        sum = 0.0;
+    const CeedScalar *v_array;
+
+    CeedVectorGetArrayRead(v, CEED_MEM_HOST, &v_array);
+    for (CeedInt i = 0; i < num_nodes; i++) sum += v_array[i];
+    CeedVectorRestoreArrayRead(v, &v_array);
+    // Summing 9 reference elements, each 2x2 => 36 sq units area
+    if (fabs(sum - 4.0 * num_elem) > CEED_EPSILON * 5e3) {
+      printf("Incorrect area computed, %g != %g (abs error %g)\n", sum, 4.0 * num_elem, fabs(sum - 4.0 * num_elem));
+    }
+  }
+
+  CeedVectorDestroy(&x_points);
+  CeedVectorDestroy(&u_points);
+  CeedVectorDestroy(&u);
+  CeedVectorDestroy(&v);
+  CeedElemRestrictionDestroy(&elem_restriction_x_points);
+  CeedElemRestrictionDestroy(&elem_restriction_u_points);
+  CeedElemRestrictionDestroy(&elem_restriction_u);
+  CeedBasisDestroy(&basis_u);
+  CeedQFunctionDestroy(&qf_to_points);
+  CeedQFunctionDestroy(&qf_from_points);
+  CeedOperatorDestroy(&op_to_points);
+  CeedOperatorDestroy(&op_from_points);
+  CeedOperatorDestroy(&op_mass);
+  CeedDestroy(&ceed);
+  return 0;
+}

tests/t599-operator.h

@@ -0,0 +1,16 @@
+// Copyright (c) 2017-2026, Lawrence Livermore National Security, LLC and other CEED contributors.
+// All Rights Reserved. See the top-level LICENSE and NOTICE files for details.
+//
+// SPDX-License-Identifier: BSD-2-Clause
+//
+// This file is part of CEED:  http://github.com/ceed
+
+#include <ceed/types.h>
+
+CEED_QFUNCTION(mass)(void *ctx, const CeedInt Q, const CeedScalar *const *in, CeedScalar *const *out) {
+  const CeedScalar *u = in[0];
+  CeedScalar       *v = out[0];
+
+  for (CeedInt i = 0; i < Q; i++) v[i] = u[i];
+  return 0;
+}