1 /*$Id: matio.c,v 1.79 2001/08/06 21:16:10 bsmith Exp $*/ 2 3 /* 4 This file contains simple binary read/write routines for matrices. 5 */ 6 7 #include "src/mat/matimpl.h" /*I "petscmat.h" I*/ 8 #include "petscsys.h" 9 PetscTruth MatLoadRegisterAllCalled = PETSC_FALSE; 10 PetscFList MatLoadList = 0; 11 12 #undef __FUNCT__ 13 #define __FUNCT__ "MatLoadRegister" 14 /*@C 15 MatLoadRegister - Allows one to register a routine that reads matrices 16 from a binary file for a particular matrix type. 17 18 Not Collective 19 20 Input Parameters: 21 + type - the type of matrix (defined in include/petscmat.h), for example, MATSEQAIJ. 22 - loader - the function that reads the matrix from the binary file. 23 24 Level: developer 25 26 .seealso: MatLoadRegisterAll(), MatLoad() 27 28 @*/ 29 int MatLoadRegister(char *sname,char *path,char *name,int (*function)(PetscViewer,MatType,Mat*)) 30 { 31 int ierr; 32 char fullname[256]; 33 34 PetscFunctionBegin; 35 ierr = PetscFListConcat(path,name,fullname);CHKERRQ(ierr); 36 ierr = PetscFListAdd(&MatLoadList,sname,fullname,(void (*)(void))function);CHKERRQ(ierr); 37 PetscFunctionReturn(0); 38 } 39 40 #undef __FUNCT__ 41 #define __FUNCT__ "MatLoadPrintHelp_Private" 42 static int MatLoadPrintHelp_Private(Mat A) 43 { 44 static PetscTruth called = PETSC_FALSE; 45 MPI_Comm comm = A->comm; 46 int ierr; 47 48 PetscFunctionBegin; 49 if (called) {PetscFunctionReturn(0);} else called = PETSC_TRUE; 50 ierr = (*PetscHelpPrintf)(comm," Options for MatLoad:\n");CHKERRQ(ierr); 51 ierr = (*PetscHelpPrintf)(comm," -mat_type <type>\n");CHKERRQ(ierr); 52 ierr = (*PetscHelpPrintf)(comm," -matload_type <type>\n");CHKERRQ(ierr); 53 ierr = (*PetscHelpPrintf)(comm," -matload_block_size <block_size> :Used for MATBAIJ, MATBDIAG\n");CHKERRQ(ierr); 54 ierr = (*PetscHelpPrintf)(comm," -matload_bdiag_diags <s1,s2,s3,...> : Used for MATBDIAG\n");CHKERRQ(ierr); 55 PetscFunctionReturn(0); 56 } 57 58 #undef __FUNCT__ 59 #define __FUNCT__ "MatLoad" 60 /*@C 61 MatLoad - Loads a matrix that has been stored in binary format 62 with MatView(). The matrix format is determined from the options database. 63 Generates a parallel MPI matrix if the communicator has more than one 64 processor. The default matrix type is AIJ. 65 66 Collective on PetscViewer 67 68 Input Parameters: 69 + viewer - binary file viewer, created with PetscViewerBinaryOpen() 70 - outtype - type of matrix desired, for example MATSEQAIJ, 71 MATMPIROWBS, etc. See types in petsc/include/petscmat.h. 72 73 Output Parameters: 74 . newmat - new matrix 75 76 Basic Options Database Keys: 77 + -matload_type seqaij - AIJ type 78 . -matload_type mpiaij - parallel AIJ type 79 . -matload_type seqbaij - block AIJ type 80 . -matload_type mpibaij - parallel block AIJ type 81 . -matload_type seqsbaij - block symmetric AIJ type 82 . -matload_type mpisbaij - parallel block symmetric AIJ type 83 . -matload_type seqbdiag - block diagonal type 84 . -matload_type mpibdiag - parallel block diagonal type 85 . -matload_type mpirowbs - parallel rowbs type 86 . -matload_type seqdense - dense type 87 . -matload_type mpidense - parallel dense type 88 - -matload_symmetric - matrix in file is symmetric 89 90 More Options Database Keys: 91 Used with block matrix formats (MATSEQBAIJ, MATMPIBDIAG, ...) to specify 92 block size 93 . -matload_block_size <bs> 94 95 Used to specify block diagonal numbers for MATSEQBDIAG and MATMPIBDIAG formats 96 . -matload_bdiag_diags <s1,s2,s3,...> 97 98 Level: beginner 99 100 Notes: 101 MatLoad() automatically loads into the options database any options 102 given in the file filename.info where filename is the name of the file 103 that was passed to the PetscViewerBinaryOpen(). The options in the info 104 file will be ignored if you use the -matload_ignore_info option. 105 106 In parallel, each processor can load a subset of rows (or the 107 entire matrix). This routine is especially useful when a large 108 matrix is stored on disk and only part of it existsis desired on each 109 processor. For example, a parallel solver may access only some of 110 the rows from each processor. The algorithm used here reads 111 relatively small blocks of data rather than reading the entire 112 matrix and then subsetting it. 113 114 Notes for advanced users: 115 Most users should not need to know the details of the binary storage 116 format, since MatLoad() and MatView() completely hide these details. 117 But for anyone who's interested, the standard binary matrix storage 118 format is 119 120 $ int MAT_FILE_COOKIE 121 $ int number of rows 122 $ int number of columns 123 $ int total number of nonzeros 124 $ int *number nonzeros in each row 125 $ int *column indices of all nonzeros (starting index is zero) 126 $ PetscScalar *values of all nonzeros 127 128 Note for Cray users, the int's stored in the binary file are 32 bit 129 integers; not 64 as they are represented in the memory, so if you 130 write your own routines to read/write these binary files from the Cray 131 you need to adjust the integer sizes that you read in, see 132 PetscReadBinary() and PetscWriteBinary() to see how this may be 133 done. 134 135 In addition, PETSc automatically does the byte swapping for 136 machines that store the bytes reversed, e.g. DEC alpha, freebsd, 137 linux, nt and the paragon; thus if you write your own binary 138 read/write routines you have to swap the bytes; see PetscReadBinary() 139 and PetscWriteBinary() to see how this may be done. 140 141 .keywords: matrix, load, binary, input 142 143 .seealso: PetscViewerBinaryOpen(), MatView(), VecLoad(), MatLoadRegister(), 144 MatLoadRegisterAll() 145 146 @*/ 147 int MatLoad(PetscViewer viewer,MatType outtype,Mat *newmat) 148 { 149 int ierr; 150 PetscTruth isbinary,flg; 151 MPI_Comm comm; 152 int (*r)(PetscViewer,MatType,Mat*); 153 char mtype[256],*prefix; 154 155 PetscFunctionBegin; 156 PetscValidHeaderSpecific(viewer,PETSC_VIEWER_COOKIE); 157 158 *newmat = 0; 159 160 if (!MatLoadRegisterAllCalled) { 161 ierr = MatLoadRegisterAll(PETSC_NULL);CHKERRQ(ierr); 162 } 163 164 ierr = PetscObjectGetOptionsPrefix((PetscObject)viewer,&prefix);CHKERRQ(ierr); 165 ierr = PetscTypeCompare((PetscObject)viewer,PETSC_VIEWER_BINARY,&isbinary);CHKERRQ(ierr); 166 if (!isbinary) { 167 SETERRQ(PETSC_ERR_ARG_WRONG,"Invalid viewer; open viewer with PetscViewerBinaryOpen()"); 168 } 169 170 ierr = PetscOptionsGetString(prefix,"-mat_type",mtype,256,&flg);CHKERRQ(ierr); 171 if (flg) { 172 outtype = mtype; 173 } 174 ierr = PetscOptionsGetString(prefix,"-matload_type",mtype,256,&flg);CHKERRQ(ierr); 175 if (flg) { 176 outtype = mtype; 177 } 178 ierr = PetscObjectGetComm((PetscObject)viewer,&comm);CHKERRQ(ierr); 179 if (!outtype) outtype = MATMPIAIJ; 180 ierr = PetscFListFind(comm,MatLoadList,outtype,(void(**)(void))&r);CHKERRQ(ierr); 181 if (!r) SETERRQ1(1,"Unknown Mat type given: %s",outtype); 182 183 ierr = PetscLogEventBegin(MAT_Load,viewer,0,0,0);CHKERRQ(ierr); 184 ierr = (*r)(viewer,outtype,newmat);CHKERRQ(ierr); 185 ierr = PetscLogEventEnd(MAT_Load,viewer,0,0,0);CHKERRQ(ierr); 186 187 ierr = PetscOptionsHasName(prefix,"-matload_symmetric",&flg);CHKERRQ(ierr); 188 if (flg) { 189 ierr = MatSetOption(*newmat,MAT_SYMMETRIC);CHKERRQ(ierr); 190 } 191 ierr = PetscOptionsHasName(PETSC_NULL,"-help",&flg);CHKERRQ(ierr); 192 if (flg) {ierr = MatLoadPrintHelp_Private(*newmat);CHKERRQ(ierr); } 193 PetscFunctionReturn(0); 194 } 195 196