xref: /honee/src/spanstats/spanstats.c (revision 17dc1449b67a89e5ac9b8b1aaaea315cd1019831)
1 // SPDX-FileCopyrightText: Copyright (c) 2017-2024, HONEE contributors.
2 // SPDX-License-Identifier: Apache-2.0 OR BSD-2-Clause
3 /// @file
4 /// Functions for setting up and performing spanwise-statistics collection
5 ///
6 /// "Parent" refers to the 2D plane on which statistics are collected *onto*.
7 /// "Child" refers to the 3D domain where statistics are gathered *from*.
8 /// Each quadrature point on the parent plane has several children in the child domain that it performs spanwise averaging with.
9 
10 #include <ceed.h>
11 #include <petscdmplex.h>
12 #include <petscsf.h>
13 #include <spanstats.h>
14 
15 #include <navierstokes.h>
16 #include <petsc_ops.h>
17 
18 PetscErrorCode SpanStatsCtxDestroy(void **ctx) {
19   SpanStatsCtx spanstats = *(SpanStatsCtx *)ctx;
20 
21   PetscFunctionBeginUser;
22   if (spanstats == NULL) PetscFunctionReturn(PETSC_SUCCESS);
23   PetscCall(VecDestroy(&spanstats->Child_Stats_loc));
24   PetscCall(VecDestroy(&spanstats->Parent_Stats_loc));
25 
26   PetscCall(OperatorApplyContextDestroy(spanstats->op_stats_collect_ctx));
27   PetscCall(OperatorApplyContextDestroy(spanstats->op_proj_rhs_ctx));
28   PetscCall(OperatorApplyContextDestroy(spanstats->mms_error_ctx));
29 
30   PetscCall(KSPDestroy(&spanstats->ksp));
31   PetscCall(PetscSFDestroy(&spanstats->sf));
32   PetscCall(DMDestroy(&spanstats->dm));
33   PetscCall(PetscFree(spanstats->prefix));
34   PetscCall(PetscFree(spanstats));
35   PetscFunctionReturn(PETSC_SUCCESS);
36 }
37 
38 static PetscErrorCode SpanwiseStatisticssCreateDM(Honee honee, SpanStatsCtx spanstats, PetscInt degree, PetscInt num_comps) {
39   PetscReal     domain_min[3], domain_max[3];
40   PetscLogStage stage_stats_setup;
41   MPI_Comm      comm = PetscObjectComm((PetscObject)honee->dm);
42 
43   PetscFunctionBeginUser;
44   PetscCall(PetscLogStageGetId("Stats Setup", &stage_stats_setup));
45   if (stage_stats_setup == -1) PetscCall(PetscLogStageRegister("Stats Setup", &stage_stats_setup));
46   PetscCall(PetscLogStagePush(stage_stats_setup));
47 
48   spanstats->num_comp_stats = num_comps;
49 
50   // Get spanwise length
51   PetscCall(DMGetBoundingBox(honee->dm, domain_min, domain_max));
52   spanstats->span_width = domain_max[2] - domain_min[2];
53 
54   {  // Get DM from surface
55     DM             parent_distributed_dm;
56     const PetscSF *isoperiodicface;
57     PetscInt       num_isoperiodicface;
58     DMLabel        label;
59     PetscMPIInt    size;
60 
61     PetscCall(DMPlexGetIsoperiodicFaceSF(honee->dm, &num_isoperiodicface, &isoperiodicface));
62 
63     if (isoperiodicface) {
64       PetscSF         inv_isoperiodicface;
65       PetscInt        nleaves, isoperiodicface_index = -1;
66       const PetscInt *ilocal;
67       char            isoperiodicface_key[1024];
68 
69       PetscCall(PetscSNPrintf(isoperiodicface_key, sizeof isoperiodicface_key, "-%sisoperiodic_facesf", spanstats->prefix));
70       PetscCall(PetscOptionsGetInt(NULL, NULL, isoperiodicface_key, &isoperiodicface_index, NULL));
71       isoperiodicface_index = isoperiodicface_index == -1 ? num_isoperiodicface - 1 : isoperiodicface_index;
72       PetscCall(PetscSFCreateInverseSF(isoperiodicface[isoperiodicface_index], &inv_isoperiodicface));
73       PetscCall(PetscSFGetGraph(inv_isoperiodicface, NULL, &nleaves, &ilocal, NULL));
74       PetscCall(DMCreateLabel(honee->dm, "Periodic Face"));
75       PetscCall(DMGetLabel(honee->dm, "Periodic Face", &label));
76       for (PetscInt i = 0; i < nleaves; i++) {
77         PetscCall(DMLabelSetValue(label, ilocal[i], 1));
78       }
79       PetscCall(PetscSFDestroy(&inv_isoperiodicface));
80     } else {
81       PetscCall(DMGetLabel(honee->dm, "Face Sets", &label));
82     }
83 
84     PetscCall(DMPlexLabelComplete(honee->dm, label));
85     PetscCall(DMPlexFilter(honee->dm, label, 1, PETSC_FALSE, PETSC_FALSE, NULL, &spanstats->dm));
86     PetscCall(DMSetCoordinateDisc(spanstats->dm, NULL, PETSC_FALSE, PETSC_TRUE));  // Ensure that a coordinate FE exists
87 
88     PetscCall(DMPlexDistribute(spanstats->dm, 0, NULL, &parent_distributed_dm));
89     PetscCallMPI(MPI_Comm_size(comm, &size));
90     if (parent_distributed_dm) {
91       PetscCall(DMDestroy(&spanstats->dm));
92       spanstats->dm = parent_distributed_dm;
93     } else if (size > 1) {
94       PetscCall(PetscPrintf(comm, "WARNING: Spanwise statistics: parent DM could not be distributed accross %d ranks.\n", size));
95     }
96   }
97   {
98     PetscBool is_simplex = PETSC_FALSE;
99     PetscCall(DMPlexIsSimplex(spanstats->dm, &is_simplex));
100     PetscCheck(is_simplex != PETSC_TRUE, comm, PETSC_ERR_ARG_WRONGSTATE, "Spanwise statistics is not implemented for non-tensor product grids");
101   }
102 
103   PetscCall(PetscObjectSetName((PetscObject)spanstats->dm, "Spanwise_Stats"));
104   PetscCall(DMSetOptionsPrefix(spanstats->dm, spanstats->prefix));
105   PetscCall(DMSetFromOptions(spanstats->dm));
106   PetscCall(DMViewFromOptions(spanstats->dm, NULL, "-dm_view"));
107 
108   // Create FE space for parent DM
109   PetscCall(
110       DMSetupByOrder_FEM(PETSC_TRUE, PETSC_TRUE, honee->app_ctx->degree, 1, honee->app_ctx->q_extra, 1, &spanstats->num_comp_stats, spanstats->dm));
111 
112   PetscCall(PetscLogStagePop());
113   PetscFunctionReturn(PETSC_SUCCESS);
114 }
115 
116 /** @brief Create CeedElemRestriction for collocated data in component-major order.
117 a. Sets the strides of the restriction to component-major order
118  Number of quadrature points is used from the CeedBasis, and number of elements is used from the CeedElemRestriction.
119 */
120 static PetscErrorCode CreateElemRestrColloc_CompMajor(Ceed ceed, CeedInt num_comp, CeedBasis basis, CeedElemRestriction elem_restr_base,
121                                                       CeedElemRestriction *elem_restr_collocated) {
122   CeedInt num_elem_qpts, loc_num_elem;
123 
124   PetscFunctionBeginUser;
125   PetscCallCeed(ceed, CeedBasisGetNumQuadraturePoints(basis, &num_elem_qpts));
126   PetscCallCeed(ceed, CeedElemRestrictionGetNumElements(elem_restr_base, &loc_num_elem));
127 
128   const CeedInt strides[] = {num_comp, 1, num_elem_qpts * num_comp};
129   PetscCallCeed(ceed, CeedElemRestrictionCreateStrided(ceed, loc_num_elem, num_elem_qpts, num_comp, num_comp * loc_num_elem * num_elem_qpts, strides,
130                                                        elem_restr_collocated));
131   PetscFunctionReturn(PETSC_SUCCESS);
132 }
133 
134 // Get coordinates of quadrature points
135 static PetscErrorCode GetQuadratureCoords(Ceed ceed, DM dm, CeedElemRestriction elem_restr_x, CeedBasis basis_x, CeedVector x_coords, Vec *Qx_coords,
136                                           PetscInt *total_nqpnts) {
137   CeedElemRestriction  elem_restr_qx;
138   CeedQFunction        qf_quad_coords;
139   CeedOperator         op_quad_coords;
140   CeedInt              num_comp_x;
141   CeedSize             l_vec_size;
142   OperatorApplyContext op_quad_coords_ctx;
143 
144   PetscFunctionBeginUser;
145   PetscCallCeed(ceed, CeedElemRestrictionGetNumComponents(elem_restr_x, &num_comp_x));
146   PetscCall(CreateElemRestrColloc_CompMajor(ceed, num_comp_x, basis_x, elem_restr_x, &elem_restr_qx));
147   PetscCallCeed(ceed, CeedElemRestrictionGetLVectorSize(elem_restr_qx, &l_vec_size));
148   *total_nqpnts = l_vec_size / num_comp_x;
149 
150   // Create QFunction
151   PetscCallCeed(ceed, CeedQFunctionCreateIdentity(ceed, num_comp_x, CEED_EVAL_INTERP, CEED_EVAL_NONE, &qf_quad_coords));
152 
153   // Create Operator
154   PetscCallCeed(ceed, CeedOperatorCreate(ceed, qf_quad_coords, NULL, NULL, &op_quad_coords));
155   PetscCallCeed(ceed, CeedOperatorSetField(op_quad_coords, "input", elem_restr_x, basis_x, x_coords));
156   PetscCallCeed(ceed, CeedOperatorSetField(op_quad_coords, "output", elem_restr_qx, CEED_BASIS_NONE, CEED_VECTOR_ACTIVE));
157 
158   PetscCall(CeedOperatorCreateLocalVecs(op_quad_coords, DMReturnVecType(dm), PETSC_COMM_SELF, NULL, Qx_coords));
159   PetscCall(OperatorApplyContextCreate(NULL, NULL, ceed, op_quad_coords, CEED_VECTOR_NONE, NULL, NULL, NULL, &op_quad_coords_ctx));
160 
161   PetscCall(ApplyCeedOperatorLocalToLocal(NULL, *Qx_coords, op_quad_coords_ctx));
162 
163   PetscCall(OperatorApplyContextDestroy(op_quad_coords_ctx));
164   PetscCallCeed(ceed, CeedElemRestrictionDestroy(&elem_restr_qx));
165   PetscCallCeed(ceed, CeedQFunctionDestroy(&qf_quad_coords));
166   PetscCallCeed(ceed, CeedOperatorDestroy(&op_quad_coords));
167   PetscFunctionReturn(PETSC_SUCCESS);
168 }
169 
170 static PetscErrorCode SpanwiseStatisticsSetupDataCreate(Honee honee, SpanStatsCtx spanstats, SpanStatsSetupData *stats_setup_data) {
171   Ceed     ceed = honee->ceed;
172   DM       dm   = spanstats->dm;
173   Vec      X_loc;
174   DMLabel  domain_label = NULL;
175   CeedInt  num_comp_x, num_comp_stats = spanstats->num_comp_stats;
176   PetscInt label_value = 0, height = 0, dm_field = 0;
177 
178   PetscFunctionBeginUser;
179   PetscCall(PetscNew(stats_setup_data));
180 
181   PetscCall(DMPlexCeedElemRestrictionCreate(ceed, dm, domain_label, label_value, height, dm_field, &(*stats_setup_data)->elem_restr_parent_stats));
182   PetscCall(DMPlexCeedElemRestrictionCoordinateCreate(ceed, dm, domain_label, label_value, height, &(*stats_setup_data)->elem_restr_parent_x));
183   PetscCallCeed(ceed, CeedElemRestrictionGetNumComponents((*stats_setup_data)->elem_restr_parent_x, &num_comp_x));
184   PetscCallCeed(ceed, CeedElemRestrictionCreateVector((*stats_setup_data)->elem_restr_parent_x, &(*stats_setup_data)->x_coord, NULL));
185 
186   {
187     DM dm_coord;
188     PetscCall(DMGetCoordinateDM(dm, &dm_coord));
189     PetscCall(CreateBasisFromPlex(ceed, dm_coord, domain_label, label_value, height, dm_field, &(*stats_setup_data)->basis_x));
190     PetscCall(CreateBasisFromPlex(ceed, dm, domain_label, label_value, height, dm_field, &(*stats_setup_data)->basis_stats));
191   }
192 
193   PetscCall(CreateElemRestrColloc_CompMajor(ceed, num_comp_stats, (*stats_setup_data)->basis_stats, (*stats_setup_data)->elem_restr_parent_stats,
194                                             &(*stats_setup_data)->elem_restr_parent_colloc));
195   PetscCall(
196       CreateElemRestrColloc_CompMajor(ceed, num_comp_stats, honee->basis_q, honee->elem_restr_q, &(*stats_setup_data)->elem_restr_child_colloc));
197 
198   {  // -- Copy DM coordinates into CeedVector
199     DM cdm;
200     PetscCall(DMGetCellCoordinateDM(dm, &cdm));
201     if (cdm) {
202       PetscCall(DMGetCellCoordinatesLocal(dm, &X_loc));
203     } else {
204       PetscCall(DMGetCoordinatesLocal(dm, &X_loc));
205     }
206   }
207   PetscCall(VecScale(X_loc, honee->units->meter));
208   PetscCall(VecCopyPetscToCeed(X_loc, (*stats_setup_data)->x_coord));
209   PetscFunctionReturn(PETSC_SUCCESS);
210 }
211 
212 static PetscErrorCode SpanwiseStatisticsSetupDataDestroy(SpanStatsSetupData data) {
213   Ceed ceed;
214 
215   PetscFunctionBeginUser;
216   PetscCall(CeedElemRestrictionGetCeed(data->elem_restr_parent_x, &ceed));
217   PetscCallCeed(ceed, CeedElemRestrictionDestroy(&data->elem_restr_parent_x));
218   PetscCallCeed(ceed, CeedElemRestrictionDestroy(&data->elem_restr_parent_stats));
219   PetscCallCeed(ceed, CeedElemRestrictionDestroy(&data->elem_restr_parent_colloc));
220   PetscCallCeed(ceed, CeedElemRestrictionDestroy(&data->elem_restr_child_colloc));
221   PetscCallCeed(ceed, CeedBasisDestroy(&data->basis_x));
222   PetscCallCeed(ceed, CeedBasisDestroy(&data->basis_stats));
223   PetscCallCeed(ceed, CeedVectorDestroy(&data->x_coord));
224   PetscCall(PetscFree(data));
225   PetscCheck(CeedDestroy(&ceed) == CEED_ERROR_SUCCESS, PETSC_COMM_SELF, PETSC_ERR_LIB, "Destroying Ceed object failed");
226   PetscFunctionReturn(PETSC_SUCCESS);
227 }
228 
229 // Create PetscSF for child-to-parent communication
230 static PetscErrorCode SpanwiseStatisticsCreateSF(Honee honee, SpanStatsSetupData stats_setup_data, DM parentdm, DM childdm, PetscSF *statssf) {
231   Ceed     ceed = honee->ceed;
232   PetscInt child_num_qpnts, parent_num_qpnts;
233   CeedInt  num_comp_x;
234   Vec      Child_qx_coords, Parent_qx_coords;
235 
236   PetscFunctionBeginUser;
237   PetscCall(PetscSFCreate(PetscObjectComm((PetscObject)childdm), statssf));
238 
239   // Assume that child and parent have the same number of components
240   PetscCallCeed(ceed, CeedBasisGetNumComponents(honee->basis_x, &num_comp_x));
241   const PetscInt num_comp_sf = num_comp_x - 1;  // Number of coord components used in the creation of the SF
242 
243   // Get quad_coords for child and parent DM
244   PetscCall(GetQuadratureCoords(ceed, childdm, honee->elem_restr_x, honee->basis_x, honee->x_coord, &Child_qx_coords, &child_num_qpnts));
245   PetscCall(GetQuadratureCoords(ceed, parentdm, stats_setup_data->elem_restr_parent_x, stats_setup_data->basis_x, stats_setup_data->x_coord,
246                                 &Parent_qx_coords, &parent_num_qpnts));
247 
248   {  // Remove z component of coordinates for matching
249     const PetscReal *child_quad_coords, *parent_quad_coords;
250     PetscReal       *child_coords, *parent_coords;
251 
252     PetscCall(VecGetArrayRead(Child_qx_coords, &child_quad_coords));
253     PetscCall(VecGetArrayRead(Parent_qx_coords, &parent_quad_coords));
254 
255     PetscCall(PetscMalloc2(child_num_qpnts * 2, &child_coords, parent_num_qpnts * 2, &parent_coords));
256     for (int i = 0; i < child_num_qpnts; i++) {
257       child_coords[0 + i * num_comp_sf] = child_quad_coords[0 + i * num_comp_x];
258       child_coords[1 + i * num_comp_sf] = child_quad_coords[1 + i * num_comp_x];
259     }
260     for (int i = 0; i < parent_num_qpnts; i++) {
261       parent_coords[0 + i * num_comp_sf] = parent_quad_coords[0 + i * num_comp_x];
262       parent_coords[1 + i * num_comp_sf] = parent_quad_coords[1 + i * num_comp_x];
263     }
264     PetscCall(VecRestoreArrayRead(Child_qx_coords, &child_quad_coords));
265     PetscCall(VecRestoreArrayRead(Parent_qx_coords, &parent_quad_coords));
266 
267     PetscCall(PetscSFSetGraphFromCoordinates(*statssf, parent_num_qpnts, child_num_qpnts, num_comp_sf, 1e-12, parent_coords, child_coords));
268     PetscCall(PetscFree2(child_coords, parent_coords));
269   }
270 
271   PetscCall(PetscSFViewFromOptions(*statssf, NULL, "-spanstats_sf_view"));
272 
273   PetscCall(VecDestroy(&Child_qx_coords));
274   PetscCall(VecDestroy(&Parent_qx_coords));
275   PetscFunctionReturn(PETSC_SUCCESS);
276 }
277 
278 // @brief Setup RHS and LHS for L^2 projection of statistics
279 static PetscErrorCode SpanwiseStatisticsSetupL2Projection(Honee honee, SpanStatsCtx spanstats, SpanStatsSetupData stats_setup_data) {
280   Ceed                ceed = honee->ceed;
281   CeedOperator        op_mass, op_proj_rhs;
282   CeedQFunction       qf_mass, qf_stats_proj;
283   CeedInt             q_data_size, num_comp_stats = spanstats->num_comp_stats;
284   CeedElemRestriction elem_restr_qd;
285   CeedVector          q_data;
286   DMLabel             domain_label = NULL;
287   PetscInt            label_value  = 0;
288 
289   PetscFunctionBeginUser;
290   // -- Create Operator for RHS of L^2 projection of statistics
291   // Simply take collocated parent data (with quadrature weight already applied) and multiply by weight function.
292   // Therefore, an Identity QF is sufficient
293   PetscCallCeed(ceed, CeedQFunctionCreateIdentity(ceed, num_comp_stats, CEED_EVAL_NONE, CEED_EVAL_INTERP, &qf_stats_proj));
294 
295   PetscCallCeed(ceed, CeedOperatorCreate(ceed, qf_stats_proj, NULL, NULL, &op_proj_rhs));
296   PetscCallCeed(ceed, CeedOperatorSetField(op_proj_rhs, "input", stats_setup_data->elem_restr_parent_colloc, CEED_BASIS_NONE, CEED_VECTOR_ACTIVE));
297   PetscCallCeed(ceed, CeedOperatorSetField(op_proj_rhs, "output", stats_setup_data->elem_restr_parent_stats, stats_setup_data->basis_stats,
298                                            CEED_VECTOR_ACTIVE));
299 
300   PetscCall(OperatorApplyContextCreate(NULL, spanstats->dm, ceed, op_proj_rhs, NULL, NULL, NULL, NULL, &spanstats->op_proj_rhs_ctx));
301   PetscCall(CeedOperatorCreateLocalVecs(op_proj_rhs, DMReturnVecType(spanstats->dm), PETSC_COMM_SELF, &spanstats->Parent_Stats_loc, NULL));
302   PetscCall(QDataGet(ceed, spanstats->dm, domain_label, label_value, stats_setup_data->elem_restr_parent_x, stats_setup_data->basis_x,
303                      stats_setup_data->x_coord, &elem_restr_qd, &q_data, &q_data_size));
304 
305   // Create Mass CeedOperator
306   PetscCall(HoneeMassQFunctionCreate(ceed, num_comp_stats, q_data_size, &qf_mass));
307   PetscCallCeed(ceed, CeedOperatorCreate(ceed, qf_mass, NULL, NULL, &op_mass));
308   PetscCallCeed(ceed,
309                 CeedOperatorSetField(op_mass, "u", stats_setup_data->elem_restr_parent_stats, stats_setup_data->basis_stats, CEED_VECTOR_ACTIVE));
310   PetscCallCeed(ceed, CeedOperatorSetField(op_mass, "qdata", elem_restr_qd, CEED_BASIS_NONE, q_data));
311   PetscCallCeed(ceed,
312                 CeedOperatorSetField(op_mass, "v", stats_setup_data->elem_restr_parent_stats, stats_setup_data->basis_stats, CEED_VECTOR_ACTIVE));
313 
314   {  // Setup KSP for L^2 projection
315     Mat mat_mass;
316     KSP ksp;
317 
318     PetscCall(MatCreateCeed(spanstats->dm, spanstats->dm, op_mass, NULL, &mat_mass));
319 
320     PetscCall(KSPCreate(PetscObjectComm((PetscObject)spanstats->dm), &ksp));
321     PetscCall(KSPSetOptionsPrefix(ksp, spanstats->prefix));
322     {
323       PC pc;
324       PetscCall(KSPGetPC(ksp, &pc));
325       PetscCall(PCSetType(pc, PCJACOBI));
326       PetscCall(PCJacobiSetType(pc, PC_JACOBI_DIAGONAL));
327       PetscCall(KSPSetType(ksp, KSPCG));
328       PetscCall(KSPSetNormType(ksp, KSP_NORM_NATURAL));
329       PetscCall(KSPSetTolerances(ksp, 1e-10, PETSC_DEFAULT, PETSC_DEFAULT, PETSC_DEFAULT));
330     }
331     PetscCall(KSPSetFromOptions_WithMatCeed(ksp, mat_mass));
332     spanstats->ksp = ksp;
333     PetscCall(MatDestroy(&mat_mass));
334   }
335 
336   PetscCallCeed(ceed, CeedElemRestrictionDestroy(&elem_restr_qd));
337   PetscCallCeed(ceed, CeedVectorDestroy(&q_data));
338   PetscCallCeed(ceed, CeedQFunctionDestroy(&qf_mass));
339   PetscCallCeed(ceed, CeedQFunctionDestroy(&qf_stats_proj));
340   PetscCallCeed(ceed, CeedOperatorDestroy(&op_mass));
341   PetscCallCeed(ceed, CeedOperatorDestroy(&op_proj_rhs));
342   PetscFunctionReturn(PETSC_SUCCESS);
343 }
344 
345 PetscErrorCode SpanwiseStatisticsSetupInitialize(Honee honee, PetscInt degree, PetscInt num_comps, const char *prefix,
346                                                  SpanStatsSetupData *stats_setup_data, SpanStatsCtx *spanstats_new) {
347   PetscLogStage stage_stats_setup;
348   SpanStatsCtx  spanstats;
349 
350   PetscFunctionBeginUser;
351   PetscCall(PetscLogStageGetId("Stats Setup", &stage_stats_setup));
352   if (stage_stats_setup == -1) PetscCall(PetscLogStageRegister("Stats Setup", &stage_stats_setup));
353   PetscCall(PetscLogStagePush(stage_stats_setup));
354 
355   PetscCall(PetscNew(&spanstats));
356   PetscCall(PetscStrallocpy(prefix, &spanstats->prefix));
357 
358   spanstats->collect_interval = 1;
359   PetscCall(PetscOptionsGetInt(NULL, prefix, "-collect_interval", &spanstats->collect_interval, NULL));
360 
361   // Create parent DM
362   PetscCall(SpanwiseStatisticssCreateDM(honee, spanstats, degree, num_comps));
363 
364   // Create necessary CeedObjects for setting up statistics
365   PetscCall(SpanwiseStatisticsSetupDataCreate(honee, spanstats, stats_setup_data));
366   //
367   // Create SF for communicating child data back their respective parents
368   PetscCall(SpanwiseStatisticsCreateSF(honee, *stats_setup_data, honee->dm, spanstats->dm, &spanstats->sf));
369 
370   *spanstats_new = spanstats;
371   PetscFunctionReturn(PETSC_SUCCESS);
372 }
373 
374 PetscErrorCode SpanwiseStatisticsSetupFinalize(TS ts, Honee honee, SpanStatsCtx spanstats, PetscViewerAndFormat *ctx,
375                                                SpanStatsSetupData *stats_setup_data) {
376   PetscFunctionBeginUser;
377   // Setup KSP and Mat for L^2 projection of statistics
378   PetscCall(SpanwiseStatisticsSetupL2Projection(honee, spanstats, *stats_setup_data));
379 
380   PetscCall(PetscViewerSetOptionsPrefix(ctx->viewer, spanstats->prefix));
381   PetscCall(PetscViewerSetFromOptions(ctx->viewer));
382 
383   PetscCall(TSGetTime(ts, &spanstats->initial_solution_time));
384   PetscCall(TSGetStepNumber(ts, &spanstats->initial_solution_step));
385   CeedScalar initial_solution_time = spanstats->initial_solution_time;  // done for type conversion
386   PetscCallCeed(honee->ceed,
387                 CeedOperatorSetContextDouble(spanstats->op_stats_collect_ctx->op, spanstats->previous_time_label, &initial_solution_time));
388 
389   PetscCall(SpanwiseStatisticsSetupDataDestroy(*stats_setup_data));
390   PetscCall(PetscLogStagePop());
391   PetscFunctionReturn(PETSC_SUCCESS);
392 }
393 
394 // Collect statistics based on the solution Q
395 PetscErrorCode SpanwiseStatisticsCollect(Honee honee, SpanStatsCtx spanstats, PetscScalar solution_time, Vec Q) {
396   PetscFunctionBeginUser;
397   PetscLogStage stage_stats_collect;
398   PetscCall(PetscLogStageGetId("Stats Collect", &stage_stats_collect));
399   if (stage_stats_collect == -1) PetscCall(PetscLogStageRegister("Stats Collect", &stage_stats_collect));
400   PetscCall(PetscLogStagePush(stage_stats_collect));
401 
402   PetscCall(UpdateBoundaryValues(honee, honee->Q_loc, solution_time));
403   PetscCallCeed(honee->ceed, CeedOperatorSetContextDouble(spanstats->op_stats_collect_ctx->op, spanstats->solution_time_label, &solution_time));
404   PetscCall(DMGlobalToLocal(honee->dm, Q, INSERT_VALUES, honee->Q_loc));
405   PetscCall(ApplyAddCeedOperatorLocalToLocal(honee->Q_loc, spanstats->Child_Stats_loc, spanstats->op_stats_collect_ctx));
406 
407   PetscCallCeed(honee->ceed, CeedOperatorSetContextDouble(spanstats->op_stats_collect_ctx->op, spanstats->previous_time_label, &solution_time));
408 
409   PetscCall(PetscLogStagePop());
410   PetscFunctionReturn(PETSC_SUCCESS);
411 }
412 
413 // Process the child statistics into parent statistics and project them onto stats
414 PetscErrorCode SpanwiseStatisticsProcess(Honee honee, SpanStatsCtx spanstats, Vec stats) {
415   const PetscScalar *child_stats;
416   PetscScalar       *parent_stats;
417   MPI_Datatype       unit;
418   Vec                RHS;
419 
420   PetscFunctionBeginUser;
421   PetscLogStage stage_stats_process;
422   PetscCall(PetscLogStageGetId("Stats Process", &stage_stats_process));
423   if (stage_stats_process == -1) PetscCall(PetscLogStageRegister("Stats Process", &stage_stats_process));
424   PetscCall(PetscLogStagePush(stage_stats_process));
425 
426   PetscCall(VecZeroEntries(spanstats->Parent_Stats_loc));
427 
428   PetscCall(VecGetArrayRead(spanstats->Child_Stats_loc, &child_stats));
429   PetscCall(VecGetArray(spanstats->Parent_Stats_loc, &parent_stats));
430 
431   if (spanstats->num_comp_stats == 1) unit = MPIU_REAL;
432   else {
433     PetscCallMPI(MPI_Type_contiguous(spanstats->num_comp_stats, MPIU_REAL, &unit));
434     PetscCallMPI(MPI_Type_commit(&unit));
435   }
436 
437   PetscCall(PetscSFReduceBegin(spanstats->sf, unit, child_stats, parent_stats, MPI_SUM));
438   PetscCall(PetscSFReduceEnd(spanstats->sf, unit, child_stats, parent_stats, MPI_SUM));
439 
440   PetscCall(VecRestoreArrayRead(spanstats->Child_Stats_loc, &child_stats));
441   PetscCall(VecRestoreArray(spanstats->Parent_Stats_loc, &parent_stats));
442   PetscCallMPI(MPI_Type_free(&unit));
443 
444   PetscReal solution_time;
445   PetscCall(DMGetOutputSequenceNumber(spanstats->dm, NULL, &solution_time));
446   PetscReal summing_duration = solution_time - honee->app_ctx->cont_time;
447   PetscCall(VecScale(spanstats->Parent_Stats_loc, 1 / (summing_duration * spanstats->span_width)));
448 
449   // L^2 projection with the parent_data
450   PetscCall(DMGetGlobalVector(spanstats->dm, &RHS));
451   PetscCall(ApplyCeedOperatorLocalToGlobal(spanstats->Parent_Stats_loc, RHS, spanstats->op_proj_rhs_ctx));
452 
453   PetscCall(KSPSolve(spanstats->ksp, RHS, stats));
454 
455   PetscCall(DMRestoreGlobalVector(spanstats->dm, &RHS));
456   PetscCall(PetscLogStagePop());
457   PetscFunctionReturn(PETSC_SUCCESS);
458 }
459