1 2 static char help[] = "Tests external direct solvers. Simplified from ex125.c\n\ 3 Example: mpiexec -n <np> ./ex130 -f <matrix binary file> -mat_solver_type 1 -mat_superlu_equil \n\n"; 4 5 #include <petscmat.h> 6 7 int main(int argc,char **args) 8 { 9 Mat A,F; 10 Vec u,x,b; 11 PetscErrorCode ierr; 12 PetscMPIInt rank,size; 13 PetscInt m,n,nfact,ipack=0; 14 PetscReal norm,tol=1.e-12,Anorm; 15 IS perm,iperm; 16 MatFactorInfo info; 17 PetscBool flg,testMatSolve=PETSC_TRUE; 18 PetscViewer fd; /* viewer */ 19 char file[PETSC_MAX_PATH_LEN]; /* input file name */ 20 21 ierr = PetscInitialize(&argc,&args,(char*)0,help);if (ierr) return ierr; 22 CHKERRMPI(MPI_Comm_rank(PETSC_COMM_WORLD, &rank)); 23 CHKERRMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size)); 24 25 /* Determine file from which we read the matrix A */ 26 CHKERRQ(PetscOptionsGetString(NULL,NULL,"-f",file,sizeof(file),&flg)); 27 PetscCheck(flg,PETSC_COMM_WORLD,PETSC_ERR_USER,"Must indicate binary file with the -f option"); 28 29 /* Load matrix A */ 30 CHKERRQ(PetscViewerBinaryOpen(PETSC_COMM_WORLD,file,FILE_MODE_READ,&fd)); 31 CHKERRQ(MatCreate(PETSC_COMM_WORLD,&A)); 32 CHKERRQ(MatLoad(A,fd)); 33 CHKERRQ(VecCreate(PETSC_COMM_WORLD,&b)); 34 CHKERRQ(VecLoad(b,fd)); 35 CHKERRQ(PetscViewerDestroy(&fd)); 36 CHKERRQ(MatGetLocalSize(A,&m,&n)); 37 PetscCheckFalse(m != n,PETSC_COMM_SELF,PETSC_ERR_ARG_SIZ, "This example is not intended for rectangular matrices (%d, %d)", m, n); 38 CHKERRQ(MatNorm(A,NORM_INFINITY,&Anorm)); 39 40 /* Create vectors */ 41 CHKERRQ(VecDuplicate(b,&x)); 42 CHKERRQ(VecDuplicate(x,&u)); /* save the true solution */ 43 44 /* Test LU Factorization */ 45 CHKERRQ(MatGetOrdering(A,MATORDERINGNATURAL,&perm,&iperm)); 46 47 CHKERRQ(PetscOptionsGetInt(NULL,NULL,"-mat_solver_type",&ipack,NULL)); 48 switch (ipack) { 49 case 1: 50 #if defined(PETSC_HAVE_SUPERLU) 51 if (rank == 0) printf(" SUPERLU LU:\n"); 52 CHKERRQ(MatGetFactor(A,MATSOLVERSUPERLU,MAT_FACTOR_LU,&F)); 53 break; 54 #endif 55 case 2: 56 #if defined(PETSC_HAVE_MUMPS) 57 if (rank == 0) printf(" MUMPS LU:\n"); 58 CHKERRQ(MatGetFactor(A,MATSOLVERMUMPS,MAT_FACTOR_LU,&F)); 59 { 60 /* test mumps options */ 61 PetscInt icntl_7 = 5; 62 CHKERRQ(MatMumpsSetIcntl(F,7,icntl_7)); 63 } 64 break; 65 #endif 66 default: 67 if (rank == 0) printf(" PETSC LU:\n"); 68 CHKERRQ(MatGetFactor(A,MATSOLVERPETSC,MAT_FACTOR_LU,&F)); 69 } 70 71 info.fill = 5.0; 72 CHKERRQ(MatLUFactorSymbolic(F,A,perm,iperm,&info)); 73 74 for (nfact = 0; nfact < 1; nfact++) { 75 if (rank == 0) printf(" %d-the LU numfactorization \n",nfact); 76 CHKERRQ(MatLUFactorNumeric(F,A,&info)); 77 78 /* Test MatSolve() */ 79 if (testMatSolve) { 80 CHKERRQ(MatSolve(F,b,x)); 81 82 /* Check the residual */ 83 CHKERRQ(MatMult(A,x,u)); 84 CHKERRQ(VecAXPY(u,-1.0,b)); 85 CHKERRQ(VecNorm(u,NORM_INFINITY,&norm)); 86 if (norm > tol) { 87 if (rank == 0) { 88 CHKERRQ(PetscPrintf(PETSC_COMM_SELF,"MatSolve: rel residual %g/%g = %g, LU numfact %d\n",norm,Anorm,norm/Anorm,nfact)); 89 } 90 } 91 } 92 } 93 94 /* Free data structures */ 95 CHKERRQ(MatDestroy(&A)); 96 CHKERRQ(MatDestroy(&F)); 97 CHKERRQ(ISDestroy(&perm)); 98 CHKERRQ(ISDestroy(&iperm)); 99 CHKERRQ(VecDestroy(&x)); 100 CHKERRQ(VecDestroy(&b)); 101 CHKERRQ(VecDestroy(&u)); 102 ierr = PetscFinalize(); 103 return ierr; 104 } 105