1c4762a1bSJed Brown 2c4762a1bSJed Brown static char help[] = "Tests external Clique direct solvers. Simplified from ex130.c\n\ 3c4762a1bSJed Brown Example: mpiexec -n <np> ./ex168 -f <matrix binary file> \n\n"; 4c4762a1bSJed Brown 5c4762a1bSJed Brown #include <petscmat.h> 6c4762a1bSJed Brown 7c4762a1bSJed Brown int main(int argc,char **args) 8c4762a1bSJed Brown { 9c4762a1bSJed Brown Mat A,F; 10c4762a1bSJed Brown Vec u,x,b; 11c4762a1bSJed Brown PetscMPIInt rank,size; 12c4762a1bSJed Brown PetscInt m,n,nfact; 13c4762a1bSJed Brown PetscReal norm,tol=1.e-12,Anorm; 14c4762a1bSJed Brown IS perm,iperm; 15c4762a1bSJed Brown MatFactorInfo info; 16c4762a1bSJed Brown PetscBool flg,testMatSolve=PETSC_TRUE; 17c4762a1bSJed Brown PetscViewer fd; /* viewer */ 18c4762a1bSJed Brown char file[PETSC_MAX_PATH_LEN]; /* input file name */ 19c4762a1bSJed Brown 20*9566063dSJacob Faibussowitsch PetscCall(PetscInitialize(&argc,&args,(char*)0,help)); 21*9566063dSJacob Faibussowitsch PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD, &rank)); 22*9566063dSJacob Faibussowitsch PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size)); 23c4762a1bSJed Brown 24c4762a1bSJed Brown /* Determine file from which we read the matrix A */ 25*9566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetString(NULL,NULL,"-f",file,sizeof(file),&flg)); 2628b400f6SJacob Faibussowitsch PetscCheck(flg,PETSC_COMM_WORLD,PETSC_ERR_USER,"Must indicate binary file with the -f option"); 27c4762a1bSJed Brown 28c4762a1bSJed Brown /* Load matrix A */ 29*9566063dSJacob Faibussowitsch PetscCall(PetscViewerBinaryOpen(PETSC_COMM_WORLD,file,FILE_MODE_READ,&fd)); 30*9566063dSJacob Faibussowitsch PetscCall(MatCreate(PETSC_COMM_WORLD,&A)); 31*9566063dSJacob Faibussowitsch PetscCall(MatLoad(A,fd)); 32*9566063dSJacob Faibussowitsch PetscCall(VecCreate(PETSC_COMM_WORLD,&b)); 33*9566063dSJacob Faibussowitsch PetscCall(VecLoad(b,fd)); 34*9566063dSJacob Faibussowitsch PetscCall(PetscViewerDestroy(&fd)); 35*9566063dSJacob Faibussowitsch PetscCall(MatGetLocalSize(A,&m,&n)); 362c71b3e2SJacob Faibussowitsch PetscCheckFalse(m != n,PETSC_COMM_SELF,PETSC_ERR_ARG_SIZ, "This example is not intended for rectangular matrices (%d, %d)", m, n); 37*9566063dSJacob Faibussowitsch PetscCall(MatNorm(A,NORM_INFINITY,&Anorm)); 38c4762a1bSJed Brown 39c4762a1bSJed Brown /* Create vectors */ 40*9566063dSJacob Faibussowitsch PetscCall(VecDuplicate(b,&x)); 41*9566063dSJacob Faibussowitsch PetscCall(VecDuplicate(x,&u)); /* save the true solution */ 42c4762a1bSJed Brown 43c4762a1bSJed Brown /* Test Cholesky Factorization */ 44*9566063dSJacob Faibussowitsch PetscCall(MatGetOrdering(A,MATORDERINGNATURAL,&perm,&iperm)); 45c4762a1bSJed Brown 46dd400576SPatrick Sanan if (rank == 0) printf(" Clique Cholesky:\n"); 47*9566063dSJacob Faibussowitsch PetscCall(MatGetFactor(A,MATSOLVERCLIQUE,MAT_FACTOR_CHOLESKY,&F)); 48c4762a1bSJed Brown 49c4762a1bSJed Brown info.fill = 5.0; 50*9566063dSJacob Faibussowitsch PetscCall(MatCholeskyFactorSymbolic(F,A,perm,&info)); 51c4762a1bSJed Brown 52c4762a1bSJed Brown for (nfact = 0; nfact < 1; nfact++) { 53dd400576SPatrick Sanan if (rank == 0) printf(" %d-the Cholesky numfactorization \n",nfact); 54*9566063dSJacob Faibussowitsch PetscCall(MatCholeskyFactorNumeric(F,A,&info)); 55c4762a1bSJed Brown 56c4762a1bSJed Brown /* Test MatSolve() */ 57c4762a1bSJed Brown if (testMatSolve && nfact == 2) { 58*9566063dSJacob Faibussowitsch PetscCall(MatSolve(F,b,x)); 59c4762a1bSJed Brown 60c4762a1bSJed Brown /* Check the residual */ 61*9566063dSJacob Faibussowitsch PetscCall(MatMult(A,x,u)); 62*9566063dSJacob Faibussowitsch PetscCall(VecAXPY(u,-1.0,b)); 63*9566063dSJacob Faibussowitsch PetscCall(VecNorm(u,NORM_INFINITY,&norm)); 64c4762a1bSJed Brown /* if (norm > tol) { */ 65dd400576SPatrick Sanan if (rank == 0) { 66*9566063dSJacob Faibussowitsch PetscCall(PetscPrintf(PETSC_COMM_SELF,"MatSolve: rel residual %g/%g = %g, LU numfact %d\n",norm,Anorm,norm/Anorm,nfact)); 67c4762a1bSJed Brown } 68c4762a1bSJed Brown /*} */ 69c4762a1bSJed Brown } 70c4762a1bSJed Brown } 71c4762a1bSJed Brown 72c4762a1bSJed Brown /* Free data structures */ 73*9566063dSJacob Faibussowitsch PetscCall(MatDestroy(&A)); 74*9566063dSJacob Faibussowitsch PetscCall(MatDestroy(&F)); 75*9566063dSJacob Faibussowitsch PetscCall(ISDestroy(&perm)); 76*9566063dSJacob Faibussowitsch PetscCall(ISDestroy(&iperm)); 77*9566063dSJacob Faibussowitsch PetscCall(VecDestroy(&x)); 78*9566063dSJacob Faibussowitsch PetscCall(VecDestroy(&b)); 79*9566063dSJacob Faibussowitsch PetscCall(VecDestroy(&u)); 80*9566063dSJacob Faibussowitsch PetscCall(PetscFinalize()); 81b122ec5aSJacob Faibussowitsch return 0; 82c4762a1bSJed Brown } 83