[1] | 1 | /*!\file Solverx
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| 2 | * \brief solver
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| 3 | */
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| 4 |
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| 5 | #include "./Solverx.h"
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| 6 |
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| 7 | #include "../shared/shared.h"
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[3332] | 8 | #include "../include/macros.h"
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[1] | 9 |
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[3226] | 10 | #ifdef HAVE_CONFIG_H
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| 11 | #include "config.h"
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| 12 | #else
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| 13 | #error "Cannot compile with HAVE_CONFIG_H symbol! run configure first!"
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| 14 | #endif
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| 15 |
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| 16 |
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[1] | 17 | void Solverx( Vec* puf, Mat Kff, Vec pf, Vec uf0, char* solver_string){
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| 18 |
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| 19 | /*output: */
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| 20 | Vec uf=NULL;
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| 21 |
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| 22 | /*intermediary: */
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| 23 | int local_m,local_n;
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| 24 |
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| 25 | /*Solver*/
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[3223] | 26 | KSP ksp=NULL;
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| 27 | PC pc=NULL;
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[1] | 28 | int iteration_number;
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| 29 | PetscTruth flag;
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| 30 | int solver_type;
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| 31 |
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| 32 | /*If initial guess for solution exists, use it to create uf, otherwise,
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| 33 | * duplicate right hand side so that solution vector has same structure*/
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| 34 | if(uf0){
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| 35 | VecDuplicate(uf0,&uf); VecCopy(uf0,uf);
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| 36 | }
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| 37 | else{
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| 38 | MatGetLocalSize(Kff,&local_m,&local_n);uf=NewVecFromLocalSize(local_n);
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| 39 | }
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| 40 |
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| 41 | /*Before preparing the solver, add options to the options database*/
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| 42 | PetscOptionsInsertMultipleString(solver_string);
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| 43 |
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| 44 | /*Process solver_string to see if we are not using special types of external solvers: */
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| 45 | PetscOptionsDetermineSolverType(&solver_type,solver_string);
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| 46 |
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[3223] | 47 | #if _PETSC_VERSION_ == 2
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[2060] | 48 | if (solver_type==MUMPSPACKAGE_LU){
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| 49 | /*Convert Kff to MATTAIJMUMPS: */
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| 50 | MatConvert(Kff,MATAIJMUMPS,MAT_REUSE_MATRIX,&Kff);
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| 51 | }
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| 52 | if (solver_type==MUMPSPACKAGE_CHOL){
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| 53 | /*Convert Kff to MATTSBAIJMUMPS: */
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| 54 | MatConvert(Kff,MATSBAIJMUMPS,MAT_REUSE_MATRIX,&Kff);
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| 55 | }
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| 56 | if (solver_type==SPOOLESPACKAGE_LU){
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| 57 | /*Convert Kff to MATTSBAIJMUMPS: */
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| 58 | MatConvert(Kff,MATAIJSPOOLES,MAT_REUSE_MATRIX,&Kff);
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| 59 | }
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| 60 | if (solver_type==SPOOLESPACKAGE_CHOL){
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| 61 | /*Convert Kff to MATTSBAIJMUMPS: */
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| 62 | MatConvert(Kff,MATSBAIJSPOOLES,MAT_REUSE_MATRIX,&Kff);
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| 63 | }
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| 64 | if (solver_type==SUPERLUDISTPACKAGE){
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| 65 | /*Convert Kff to MATTSBAIJMUMPS: */
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| 66 | MatConvert(Kff,MATSUPERLU_DIST,MAT_REUSE_MATRIX,&Kff);
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| 67 | }
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[3223] | 68 | #endif
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[1] | 69 |
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| 70 | /*Prepare solver*/
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| 71 | KSPCreate(MPI_COMM_WORLD,&ksp);
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| 72 | KSPSetOperators(ksp,Kff,Kff,DIFFERENT_NONZERO_PATTERN);
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| 73 | KSPSetFromOptions(ksp);
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| 74 |
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[3223] | 75 | #if _PETSC_VERSION_ == 3
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| 76 | /*specific solver?: */
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| 77 | KSPGetPC(ksp,&pc);
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| 78 | if (solver_type==MUMPSPACKAGE_LU){
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| 79 | PCFactorSetMatSolverPackage(pc,MAT_SOLVER_MUMPS);
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| 80 | }
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| 81 | #endif
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| 82 |
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| 83 |
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[1] | 84 | /*If initial guess for solution, use it, except if we are using the MUMPS direct solver, where any initial
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| 85 | * guess will crash Petsc: */
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| 86 | if (uf0){
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| 87 | if( (solver_type!=MUMPSPACKAGE_LU) && (solver_type!=MUMPSPACKAGE_CHOL) && (solver_type!=SPOOLESPACKAGE_LU)&& (solver_type!=SPOOLESPACKAGE_CHOL)&& (solver_type!=SUPERLUDISTPACKAGE)){
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| 88 | KSPSetInitialGuessNonzero(ksp,PETSC_TRUE);
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| 89 | }
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| 90 | }
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| 91 |
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| 92 | KSPSolve(ksp,pf,uf);
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| 93 |
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| 94 | /*Check convergence*/
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| 95 | KSPGetIterationNumber(ksp,&iteration_number);
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| 96 | if (iteration_number<0){
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[3570] | 97 | ISSMERROR("%s%i"," Solver diverged at iteration number: ",-iteration_number);
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[1] | 98 | }
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| 99 |
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| 100 | /*Free ressources:*/
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| 101 | KSPFree(&ksp);
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| 102 |
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| 103 |
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| 104 | /*Assign output pointers:*/
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| 105 | *puf=uf;
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| 106 | }
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