1 // Copyright (c) 2017, Lawrence Livermore National Security, LLC. Produced at 2 // the Lawrence Livermore National Laboratory. LLNL-CODE-734707. All Rights 3 // reserved. See files LICENSE and NOTICE for details. 4 // 5 // This file is part of CEED, a collection of benchmarks, miniapps, software 6 // libraries and APIs for efficient high-order finite element and spectral 7 // element discretizations for exascale applications. For more information and 8 // source code availability see http://github.com/ceed. 9 // 10 // The CEED research is supported by the Exascale Computing Project 17-SC-20-SC, 11 // a collaborative effort of two U.S. Department of Energy organizations (Office 12 // of Science and the National Nuclear Security Administration) responsible for 13 // the planning and preparation of a capable exascale ecosystem, including 14 // software, applications, hardware, advanced system engineering and early 15 // testbed platforms, in support of the nation's exascale computing imperative. 16 17 /// @file 18 /// Matrix shell operations for solid mechanics example using PETSc 19 20 #include "../elasticity.h" 21 22 // ----------------------------------------------------------------------------- 23 // libCEED Operators for MatShell 24 // ----------------------------------------------------------------------------- 25 // This function uses libCEED to compute the local action of an operator 26 PetscErrorCode ApplyLocalCeedOp(Vec X, Vec Y, UserMult user) { 27 PetscErrorCode ierr; 28 PetscScalar *x, *y; 29 30 PetscFunctionBeginUser; 31 32 // Global-to-local 33 ierr = DMGlobalToLocal(user->dm, X, INSERT_VALUES, user->Xloc); CHKERRQ(ierr); 34 ierr = VecZeroEntries(user->Yloc); CHKERRQ(ierr); 35 36 // Setup CEED vectors 37 ierr = user->VecGetArrayRead(user->Xloc, (const PetscScalar **)&x); 38 CHKERRQ(ierr); 39 ierr = user->VecGetArray(user->Yloc, &y); CHKERRQ(ierr); 40 CeedVectorSetArray(user->Xceed, user->memType, CEED_USE_POINTER, x); 41 CeedVectorSetArray(user->Yceed, user->memType, CEED_USE_POINTER, y); 42 43 // Apply CEED operator 44 // Note: We could use VecGetArrayInPlace. Instead, we use SetArray/TakeArray 45 // so we can request host memory for easier debugging. 46 CeedOperatorApply(user->op, user->Xceed, user->Yceed, CEED_REQUEST_IMMEDIATE); 47 48 // Restore PETSc vectors 49 CeedVectorTakeArray(user->Xceed, user->memType, NULL); 50 CeedVectorTakeArray(user->Yceed, user->memType, NULL); 51 ierr = user->VecRestoreArrayRead(user->Xloc, (const PetscScalar **)&x); 52 CHKERRQ(ierr); 53 ierr = user->VecRestoreArray(user->Yloc, &y); CHKERRQ(ierr); 54 55 // Local-to-global 56 ierr = VecZeroEntries(Y); CHKERRQ(ierr); 57 ierr = DMLocalToGlobal(user->dm, user->Yloc, ADD_VALUES, Y); CHKERRQ(ierr); 58 59 PetscFunctionReturn(0); 60 }; 61 62 // This function uses libCEED to compute the non-linear residual 63 PetscErrorCode FormResidual_Ceed(SNES snes, Vec X, Vec Y, void *ctx) { 64 PetscErrorCode ierr; 65 UserMult user = (UserMult)ctx; 66 67 PetscFunctionBeginUser; 68 69 // Use computed BCs 70 ierr = VecZeroEntries(user->Xloc); CHKERRQ(ierr); 71 ierr = DMPlexInsertBoundaryValues(user->dm, PETSC_TRUE, user->Xloc, 72 user->loadIncrement, NULL, NULL, NULL); 73 CHKERRQ(ierr); 74 75 // libCEED for local action of residual evaluator 76 ierr = ApplyLocalCeedOp(X, Y, user); CHKERRQ(ierr); 77 78 PetscFunctionReturn(0); 79 }; 80 81 // This function uses libCEED to apply the Jacobian for assembly via a SNES 82 PetscErrorCode ApplyJacobianCoarse_Ceed(SNES snes, Vec X, Vec Y, void *ctx) { 83 PetscErrorCode ierr; 84 UserMult user = (UserMult)ctx; 85 86 PetscFunctionBeginUser; 87 88 // Zero boundary values 89 ierr = VecZeroEntries(user->Xloc); CHKERRQ(ierr); 90 91 // libCEED for local action of residual evaluator 92 ierr = ApplyLocalCeedOp(X, Y, user); CHKERRQ(ierr); 93 94 PetscFunctionReturn(0); 95 }; 96 97 // This function uses libCEED to compute the action of the Jacobian 98 PetscErrorCode ApplyJacobian_Ceed(Mat A, Vec X, Vec Y) { 99 PetscErrorCode ierr; 100 UserMult user; 101 102 PetscFunctionBeginUser; 103 104 // Zero boundary values 105 ierr = MatShellGetContext(A, &user); CHKERRQ(ierr); 106 ierr = VecZeroEntries(user->Xloc); CHKERRQ(ierr); 107 108 // libCEED for local action of Jacobian 109 ierr = ApplyLocalCeedOp(X, Y, user); CHKERRQ(ierr); 110 111 PetscFunctionReturn(0); 112 }; 113 114 // This function uses libCEED to compute the action of the prolongation operator 115 PetscErrorCode Prolong_Ceed(Mat A, Vec X, Vec Y) { 116 PetscErrorCode ierr; 117 UserMultProlongRestr user; 118 PetscScalar *c, *f; 119 120 PetscFunctionBeginUser; 121 122 ierr = MatShellGetContext(A, &user); CHKERRQ(ierr); 123 124 // Global-to-local 125 ierr = VecZeroEntries(user->locVecC); CHKERRQ(ierr); 126 ierr = DMGlobalToLocal(user->dmC, X, INSERT_VALUES, user->locVecC); 127 CHKERRQ(ierr); 128 ierr = VecZeroEntries(user->locVecF); CHKERRQ(ierr); 129 130 // Setup CEED vectors 131 ierr = user->VecGetArrayRead(user->locVecC, (const PetscScalar **)&c); 132 CHKERRQ(ierr); 133 ierr = user->VecGetArray(user->locVecF, &f); CHKERRQ(ierr); 134 CeedVectorSetArray(user->ceedVecC, user->memType, CEED_USE_POINTER, c); 135 CeedVectorSetArray(user->ceedVecF, user->memType, CEED_USE_POINTER, f); 136 137 // Apply CEED operator 138 CeedOperatorApply(user->opProlong, user->ceedVecC, user->ceedVecF, 139 CEED_REQUEST_IMMEDIATE); 140 141 // Restore PETSc vectors 142 CeedVectorTakeArray(user->ceedVecC, user->memType, NULL); 143 CeedVectorTakeArray(user->ceedVecF, user->memType, NULL); 144 ierr = user->VecRestoreArrayRead(user->locVecC, (const PetscScalar **)&c); 145 CHKERRQ(ierr); 146 ierr = user->VecRestoreArray(user->locVecF, &f); CHKERRQ(ierr); 147 148 // Local-to-global 149 ierr = VecZeroEntries(Y); CHKERRQ(ierr); 150 ierr = DMLocalToGlobal(user->dmF, user->locVecF, ADD_VALUES, Y); 151 CHKERRQ(ierr); 152 153 PetscFunctionReturn(0); 154 } 155 156 // This function uses libCEED to compute the action of the restriction operator 157 PetscErrorCode Restrict_Ceed(Mat A, Vec X, Vec Y) { 158 PetscErrorCode ierr; 159 UserMultProlongRestr user; 160 PetscScalar *c, *f; 161 162 PetscFunctionBeginUser; 163 164 ierr = MatShellGetContext(A, &user); CHKERRQ(ierr); 165 166 // Global-to-local 167 ierr = VecZeroEntries(user->locVecF); CHKERRQ(ierr); 168 ierr = DMGlobalToLocal(user->dmF, X, INSERT_VALUES, user->locVecF); 169 CHKERRQ(ierr); 170 ierr = VecZeroEntries(user->locVecC); CHKERRQ(ierr); 171 172 // Setup CEED vectors 173 ierr = user->VecGetArrayRead(user->locVecF, (const PetscScalar **)&f); 174 CHKERRQ(ierr); 175 ierr = user->VecGetArray(user->locVecC, &c); CHKERRQ(ierr); 176 CeedVectorSetArray(user->ceedVecF, user->memType, CEED_USE_POINTER, f); 177 CeedVectorSetArray(user->ceedVecC, user->memType, CEED_USE_POINTER, c); 178 179 // Apply CEED operator 180 CeedOperatorApply(user->opRestrict, user->ceedVecF, user->ceedVecC, 181 CEED_REQUEST_IMMEDIATE); 182 183 // Restore PETSc vectors 184 CeedVectorTakeArray(user->ceedVecF, user->memType, NULL); 185 CeedVectorTakeArray(user->ceedVecC, user->memType, NULL); 186 ierr = user->VecRestoreArrayRead(user->locVecF, (const PetscScalar **)&f); 187 CHKERRQ(ierr); 188 ierr = user->VecRestoreArray(user->locVecC, &c); CHKERRQ(ierr); 189 190 // Local-to-global 191 ierr = VecZeroEntries(Y); CHKERRQ(ierr); 192 ierr = DMLocalToGlobal(user->dmC, user->locVecC, ADD_VALUES, Y); 193 CHKERRQ(ierr); 194 195 PetscFunctionReturn(0); 196 }; 197 198 // This function returns the computed diagonal of the operator 199 PetscErrorCode GetDiag_Ceed(Mat A, Vec D) { 200 PetscErrorCode ierr; 201 UserMult user; 202 203 PetscFunctionBeginUser; 204 205 ierr = MatShellGetContext(A, &user); CHKERRQ(ierr); 206 207 // -- Set physics context 208 if (user->ctxPhysSmoother) 209 CeedQFunctionSetContext(user->qf, user->ctxPhysSmoother); 210 211 // Compute Diagonal via libCEED 212 PetscScalar *x; 213 214 // -- Place PETSc vector in libCEED vector 215 ierr = user->VecGetArray(user->Xloc, &x); CHKERRQ(ierr); 216 CeedVectorSetArray(user->Xceed, user->memType, CEED_USE_POINTER, x); 217 218 // -- Compute Diagonal 219 CeedOperatorLinearAssembleDiagonal(user->op, user->Xceed, 220 CEED_REQUEST_IMMEDIATE); 221 222 // -- Reset physics context 223 if (user->ctxPhysSmoother) 224 CeedQFunctionSetContext(user->qf, user->ctxPhys); 225 226 // -- Local-to-Global 227 CeedVectorTakeArray(user->Xceed, user->memType, NULL); 228 ierr = user->VecRestoreArray(user->Xloc, &x); CHKERRQ(ierr); 229 ierr = VecZeroEntries(D); CHKERRQ(ierr); 230 ierr = DMLocalToGlobal(user->dm, user->Xloc, ADD_VALUES, D); CHKERRQ(ierr); 231 232 // Cleanup 233 ierr = VecZeroEntries(user->Xloc); CHKERRQ(ierr); 234 235 PetscFunctionReturn(0); 236 }; 237 238 // This function calculates the strain energy in the final solution 239 PetscErrorCode ComputeStrainEnergy(DM dmEnergy, UserMult user, 240 CeedOperator opEnergy, Vec X, 241 PetscReal *energy) { 242 PetscErrorCode ierr; 243 PetscScalar *x; 244 CeedInt length; 245 246 PetscFunctionBeginUser; 247 248 // Global-to-local 249 ierr = VecZeroEntries(user->Xloc); CHKERRQ(ierr); 250 ierr = DMGlobalToLocal(user->dm, X, INSERT_VALUES, user->Xloc); CHKERRQ(ierr); 251 ierr = DMPlexInsertBoundaryValues(user->dm, PETSC_TRUE, user->Xloc, 252 user->loadIncrement, NULL, NULL, NULL); 253 CHKERRQ(ierr); 254 255 // Setup libCEED input vector 256 ierr = user->VecGetArrayRead(user->Xloc, (const PetscScalar **)&x); 257 CHKERRQ(ierr); 258 CeedVectorSetArray(user->Xceed, user->memType, CEED_USE_POINTER, x); 259 260 // Setup libCEED output vector 261 Vec Eloc; 262 CeedVector eloc; 263 ierr = DMCreateLocalVector(dmEnergy, &Eloc); CHKERRQ(ierr); 264 ierr = VecGetSize(Eloc, &length); CHKERRQ(ierr); 265 ierr = VecDestroy(&Eloc); CHKERRQ(ierr); 266 CeedVectorCreate(user->ceed, length, &eloc); 267 268 // Apply libCEED operator 269 CeedOperatorApply(opEnergy, user->Xceed, eloc, CEED_REQUEST_IMMEDIATE); 270 271 // Restore PETSc vector 272 ierr = user->VecRestoreArrayRead(user->Xloc, (const PetscScalar **)&x); 273 CHKERRQ(ierr); 274 275 // Reduce max error 276 const CeedScalar *e; 277 CeedVectorGetArrayRead(eloc, CEED_MEM_HOST, &e); 278 (*energy) = 0; 279 for (CeedInt i=0; i<length; i++) 280 (*energy) += e[i]; 281 CeedVectorRestoreArrayRead(eloc, &e); 282 CeedVectorDestroy(&eloc); 283 284 ierr = MPI_Allreduce(MPI_IN_PLACE, energy, 1, MPIU_REAL, MPIU_SUM, 285 user->comm); CHKERRQ(ierr); 286 287 PetscFunctionReturn(0); 288 }; 289