1c4762a1bSJed Brown 2c4762a1bSJed Brown static char help[] = "Reads a PETSc matrix and vector from a file and reorders it.\n\ 3c4762a1bSJed Brown -f0 <input_file> : first file to load (small system)\n\ 4c4762a1bSJed Brown -f1 <input_file> : second file to load (larger system)\n\n"; 5c4762a1bSJed Brown 6c4762a1bSJed Brown /*T 7c4762a1bSJed Brown Concepts: Mat^ordering a matrix - loading a binary matrix and vector; 8c4762a1bSJed Brown Concepts: Mat^loading a binary matrix and vector; 9c4762a1bSJed Brown Concepts: Vectors^loading a binary vector; 10c4762a1bSJed Brown Concepts: PetscLog^preloading executable 11c4762a1bSJed Brown Processors: 1 12c4762a1bSJed Brown T*/ 13c4762a1bSJed Brown 14c4762a1bSJed Brown /* 15c4762a1bSJed Brown Include "petscmat.h" so that we can use matrices. 16c4762a1bSJed Brown automatically includes: 17c4762a1bSJed Brown petscsys.h - base PETSc routines petscvec.h - vectors 18c4762a1bSJed Brown petscmat.h - matrices 19c4762a1bSJed Brown petscis.h - index sets petscviewer.h - viewers 20c4762a1bSJed Brown */ 21c4762a1bSJed Brown #include <petscmat.h> 22c4762a1bSJed Brown 23c4762a1bSJed Brown int main(int argc,char **args) 24c4762a1bSJed Brown { 25c4762a1bSJed Brown Mat A; /* matrix */ 26c4762a1bSJed Brown PetscViewer fd; /* viewer */ 27c4762a1bSJed Brown char file[PETSC_MAX_PATH_LEN]; /* input file name */ 28c4762a1bSJed Brown IS isrow,iscol; /* row and column permutations */ 29c4762a1bSJed Brown MatOrderingType rtype = MATORDERINGRCM; 30c4762a1bSJed Brown PetscBool flg; 31c4762a1bSJed Brown 32*9566063dSJacob Faibussowitsch PetscCall(PetscInitialize(&argc,&args,(char*)0,help)); 33c4762a1bSJed Brown /* 34c4762a1bSJed Brown Determine files from which we read the two linear systems 35c4762a1bSJed Brown (matrix and right-hand-side vector). 36c4762a1bSJed Brown */ 37*9566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetString(NULL,NULL,"-f",file,sizeof(file),&flg)); 3828b400f6SJacob Faibussowitsch PetscCheck(flg,PETSC_COMM_WORLD,PETSC_ERR_USER,"Must indicate binary file with the -f option"); 39c4762a1bSJed Brown 40c4762a1bSJed Brown /* ----------------------------------------------------------- 41c4762a1bSJed Brown Beginning of loop 42c4762a1bSJed Brown ----------------------------------------------------------- */ 43c4762a1bSJed Brown /* 44c4762a1bSJed Brown Loop through the reordering 2 times. 45c4762a1bSJed Brown - The intention here is to preload and solve a small system; 46c4762a1bSJed Brown then load another (larger) system and solve it as well. 47c4762a1bSJed Brown This process preloads the instructions with the smaller 48c4762a1bSJed Brown system so that more accurate performance monitoring (via 49c4762a1bSJed Brown -log_view) can be done with the larger one (that actually 50c4762a1bSJed Brown is the system of interest). 51c4762a1bSJed Brown */ 52c4762a1bSJed Brown 53c4762a1bSJed Brown /* - - - - - - - - - - - New Stage - - - - - - - - - - - - - 54c4762a1bSJed Brown Load system i 55c4762a1bSJed Brown - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */ 56c4762a1bSJed Brown 57c4762a1bSJed Brown /* 58c4762a1bSJed Brown Open binary file. Note that we use FILE_MODE_READ to indicate 59c4762a1bSJed Brown reading from this file. 60c4762a1bSJed Brown */ 61*9566063dSJacob Faibussowitsch PetscCall(PetscViewerBinaryOpen(PETSC_COMM_WORLD,file,FILE_MODE_READ,&fd)); 62c4762a1bSJed Brown 63c4762a1bSJed Brown /* 64c4762a1bSJed Brown Load the matrix; then destroy the viewer. 65c4762a1bSJed Brown */ 66*9566063dSJacob Faibussowitsch PetscCall(MatCreate(PETSC_COMM_WORLD,&A)); 67*9566063dSJacob Faibussowitsch PetscCall(MatSetType(A,MATSEQAIJ)); 68*9566063dSJacob Faibussowitsch PetscCall(MatLoad(A,fd)); 69*9566063dSJacob Faibussowitsch PetscCall(PetscViewerDestroy(&fd)); 70c4762a1bSJed Brown 71*9566063dSJacob Faibussowitsch PetscCall(MatGetOrdering(A,rtype,&isrow,&iscol)); 72*9566063dSJacob Faibussowitsch PetscCall(ISView(isrow,PETSC_VIEWER_STDOUT_WORLD)); 73c4762a1bSJed Brown 74c4762a1bSJed Brown /* 75c4762a1bSJed Brown Free work space. All PETSc objects should be destroyed when they 76c4762a1bSJed Brown are no longer needed. 77c4762a1bSJed Brown */ 78*9566063dSJacob Faibussowitsch PetscCall(MatDestroy(&A)); 79*9566063dSJacob Faibussowitsch PetscCall(ISDestroy(&isrow)); 80*9566063dSJacob Faibussowitsch PetscCall(ISDestroy(&iscol)); 81c4762a1bSJed Brown 82*9566063dSJacob Faibussowitsch PetscCall(PetscFinalize()); 83b122ec5aSJacob Faibussowitsch return 0; 84c4762a1bSJed Brown } 85c4762a1bSJed Brown 86c4762a1bSJed Brown /*TEST 87c4762a1bSJed Brown 88c4762a1bSJed Brown test: 89dfd57a17SPierre Jolivet requires: datafilespath double !complex !defined(PETSC_USE_64BIT_INDICES) 90c4762a1bSJed Brown args: -f ${DATAFILESPATH}/matrices/medium -viewer_binary_skip_info 91c4762a1bSJed Brown 92c4762a1bSJed Brown TEST*/ 93