Actual source code: ex10.c

petsc-master 2014-12-20
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  2: static char help[] = "Tests I/O of vectors for different data formats (binary,HDF5,NetCDF) and illustrates the use of user-defined event logging\n\n";

  4: #include <petscvec.h>
  5: #include <petscviewerhdf5.h>

  7: /* Note:  Most applications would not read and write a vector within
  8:   the same program.  This example is intended only to demonstrate
  9:   both input and output and is written for use with either 1,2,or 4 processors. */

 13: int main(int argc,char **args)
 14: {
 16:   PetscMPIInt    rank,size;
 17:   PetscInt       i,m = 20,low,high,ldim,iglobal,lsize;
 18:   PetscScalar    v;
 19:   Vec            u;
 20:   PetscViewer    viewer;
 21:   PetscBool      vstage2,vstage3,mpiio_use,isbinary,ishdf5;
 22: #if defined(PETSC_USE_LOG)
 23:   PetscLogEvent  VECTOR_GENERATE,VECTOR_READ;
 24: #endif

 26:   PetscInitialize(&argc,&args,(char*)0,help);
 27:   isbinary  = ishdf5 = PETSC_FALSE;
 28:   mpiio_use = vstage2 = vstage3 = PETSC_FALSE;

 30:   PetscOptionsGetBool(NULL,"-binary",&isbinary,NULL);
 31:   PetscOptionsGetBool(NULL,"-hdf5",&ishdf5,NULL);
 32:   PetscOptionsGetBool(NULL,"-mpiio",&mpiio_use,NULL);
 33:   PetscOptionsGetBool(NULL,"-sizes_set",&vstage2,NULL);
 34:   PetscOptionsGetBool(NULL,"-type_set",&vstage3,NULL);

 36:   MPI_Comm_rank(PETSC_COMM_WORLD,&rank);
 37:   MPI_Comm_size(PETSC_COMM_WORLD,&size);
 38:   PetscOptionsGetInt(NULL,"-m",&m,NULL);

 40:   /* PART 1:  Generate vector, then write it in the given data format */

 42:   PetscLogEventRegister("Generate Vector",VEC_CLASSID,&VECTOR_GENERATE);
 43:   PetscLogEventBegin(VECTOR_GENERATE,0,0,0,0);
 44:   /* Generate vector */
 45:   VecCreate(PETSC_COMM_WORLD,&u);
 46:   PetscObjectSetName((PetscObject)u, "Test_Vec");
 47:   VecSetSizes(u,PETSC_DECIDE,m);
 48:   VecSetFromOptions(u);
 49:   VecGetOwnershipRange(u,&low,&high);
 50:   VecGetLocalSize(u,&ldim);
 51:   for (i=0; i<ldim; i++) {
 52:     iglobal = i + low;
 53:     v       = (PetscScalar)(i + 100*rank);
 54:     VecSetValues(u,1,&iglobal,&v,INSERT_VALUES);
 55:   }
 56:   VecAssemblyBegin(u);
 57:   VecAssemblyEnd(u);
 58:   VecView(u,PETSC_VIEWER_STDOUT_WORLD);

 60:   if (isbinary) {
 61:     PetscPrintf(PETSC_COMM_WORLD,"writing vector in binary to vector.dat ...\n");
 62:     PetscViewerBinaryOpen(PETSC_COMM_WORLD,"vector.dat",FILE_MODE_WRITE,&viewer);
 63: #if defined(PETSC_HAVE_HDF5)
 64:   } else if (ishdf5) {
 65:     PetscPrintf(PETSC_COMM_WORLD,"writing vector in hdf5 to vector.dat ...\n");
 66:     PetscViewerHDF5Open(PETSC_COMM_WORLD,"vector.dat",FILE_MODE_WRITE,&viewer);
 67: #endif
 68:   } else SETERRQ(PETSC_COMM_WORLD,PETSC_ERR_SUP,"No data format specified, run with either -binary or -hdf5 option\n");
 69:   VecView(u,viewer);
 70:   PetscViewerDestroy(&viewer);
 71:   VecDestroy(&u);
 72:   /*  PetscOptionsClear(); */


 75:   PetscLogEventEnd(VECTOR_GENERATE,0,0,0,0);

 77:   /* PART 2:  Read in vector in binary format */

 79:   /* Read new vector in binary format */
 80:   PetscLogEventRegister("Read Vector",VEC_CLASSID,&VECTOR_READ);
 81:   PetscLogEventBegin(VECTOR_READ,0,0,0,0);
 82:   if (mpiio_use) {
 83:     PetscPrintf(PETSC_COMM_WORLD,"Using MPI IO for reading the vector\n");
 84:     PetscOptionsSetValue("-viewer_binary_mpiio","");
 85:   }
 86:   if (isbinary) {
 87:     PetscPrintf(PETSC_COMM_WORLD,"reading vector in binary from vector.dat ...\n");
 88:     PetscViewerBinaryOpen(PETSC_COMM_WORLD,"vector.dat",FILE_MODE_READ,&viewer);
 89:     PetscViewerBinarySetFlowControl(viewer,2);
 90: #if defined(PETSC_HAVE_HDF5)
 91:   } else if (ishdf5) {
 92:     PetscPrintf(PETSC_COMM_WORLD,"reading vector in hdf5 from vector.dat ...\n");
 93:     PetscViewerHDF5Open(PETSC_COMM_WORLD,"vector.dat",FILE_MODE_READ,&viewer);
 94: #endif
 95:   }
 96:   VecCreate(PETSC_COMM_WORLD,&u);
 97:   PetscObjectSetName((PetscObject) u,"Test_Vec");

 99:   if (vstage2) {
100:     PetscPrintf(PETSC_COMM_WORLD,"Setting vector sizes...\n");
101:     if (size > 1) {
102:       if (!rank) {
103:         lsize = m/size + size;
104:         VecSetSizes(u,lsize,m);
105:       } else if (rank == size-1) {
106:         lsize = m/size - size;
107:         VecSetSizes(u,lsize,m);
108:       } else {
109:         lsize = m/size;
110:         VecSetSizes(u,lsize,m);
111:       }
112:     } else {
113:       VecSetSizes(u,m,m);
114:     }
115:   }

117:   if (vstage3) {
118:     PetscPrintf(PETSC_COMM_WORLD,"Setting vector type...\n");
119:     VecSetType(u, VECMPI);
120:   }
121:   VecLoad(u,viewer);
122:   PetscViewerDestroy(&viewer);
123:   PetscLogEventEnd(VECTOR_READ,0,0,0,0);
124:   VecView(u,PETSC_VIEWER_STDOUT_WORLD);

126:   /* Free data structures */
127:   VecDestroy(&u);
128:   PetscFinalize();
129:   return 0;
130: }