Exemple #1
0
int main(int argc, char *argv[])
{
    superlu_options_t options;
    SuperLUStat_t stat;
    SuperMatrix A;
    NRformat_loc *Astore;
    ScalePermstruct_t ScalePermstruct;
    LUstruct_t LUstruct;
    SOLVEstruct_t SOLVEstruct;
    gridinfo_t grid;
    double   *berr;
    double   *b, *b1, *xtrue, *nzval, *nzval1;
    int_t    *colind, *colind1, *rowptr, *rowptr1;
    int_t    i, j, m, n, nnz_loc, m_loc, fst_row;
    int      nprow, npcol;
    int      iam, info, ldb, ldx, nrhs;
    char     **cpp, c;
    FILE *fp, *fopen();


    nprow = 1;  /* Default process rows.      */
    npcol = 1;  /* Default process columns.   */
    nrhs = 1;   /* Number of right-hand side. */

    /* ------------------------------------------------------------
       INITIALIZE MPI ENVIRONMENT. 
       ------------------------------------------------------------*/
    MPI_Init( &argc, &argv );

    /* Parse command line argv[]. */
    for (cpp = argv+1; *cpp; ++cpp) {
	if ( **cpp == '-' ) {
	    c = *(*cpp+1);
	    ++cpp;
	    switch (c) {
	      case 'h':
		  printf("Options:\n");
		  printf("\t-r <int>: process rows    (default %d)\n", nprow);
		  printf("\t-c <int>: process columns (default %d)\n", npcol);
		  exit(0);
		  break;
	      case 'r': nprow = atoi(*cpp);
		        break;
	      case 'c': npcol = atoi(*cpp);
		        break;
	    }
	} else { /* Last arg is considered a filename */
	    if ( !(fp = fopen(*cpp, "r")) ) {
                ABORT("File does not exist");
            }
	    break;
	}
    }

    /* ------------------------------------------------------------
       INITIALIZE THE SUPERLU PROCESS GRID. 
       ------------------------------------------------------------*/
    superlu_gridinit(MPI_COMM_WORLD, nprow, npcol, &grid);

    /* Bail out if I do not belong in the grid. */
    iam = grid.iam;
    if ( iam >= nprow * npcol )	goto out;
    if ( !iam ) {
	printf("Input matrix file: %s\n", *cpp);
        printf("\tProcess grid\t%d X %d\n", grid.nprow, grid.npcol);
    }
    
#if ( DEBUGlevel>=1 )
    CHECK_MALLOC(iam, "Enter main()");
#endif

    /* ------------------------------------------------------------
       GET THE MATRIX FROM FILE AND SETUP THE RIGHT HAND SIDE. 
       ------------------------------------------------------------*/
    dcreate_matrix(&A, nrhs, &b, &ldb, &xtrue, &ldx, fp, &grid);

    if ( !(b1 = doubleMalloc_dist(ldb * nrhs)) )
        ABORT("Malloc fails for b1[]");
    for (j = 0; j < nrhs; ++j)
        for (i = 0; i < ldb; ++i) b1[i+j*ldb] = b[i+j*ldb];
    if ( !(berr = doubleMalloc_dist(nrhs)) )
	ABORT("Malloc fails for berr[].");
    m = A.nrow;
    n = A.ncol;

    /* Save a copy of the matrix A. */
    Astore = (NRformat_loc *) A.Store;
    nnz_loc = Astore->nnz_loc;
    m_loc = Astore->m_loc;
    fst_row = Astore->fst_row;
    nzval = Astore->nzval;
    colind = Astore->colind;
    rowptr = Astore->rowptr;
    nzval1 = doubleMalloc_dist(nnz_loc);
    colind1 = intMalloc_dist(nnz_loc);
    rowptr1 = intMalloc_dist(m_loc+1);
    for (i = 0; i < nnz_loc; ++i) {
        nzval1[i] = nzval[i];
        colind1[i] = colind[i];
    }
    for (i = 0; i < m_loc+1; ++i) rowptr1[i] = rowptr[i];

    /* ------------------------------------------------------------
       WE SOLVE THE LINEAR SYSTEM FOR THE FIRST TIME.
       ------------------------------------------------------------*/

    /* Set the default input options:
        options.Fact = DOFACT;
        options.Equil = YES;
        options.ColPerm = METIS_AT_PLUS_A;
        options.RowPerm = LargeDiag;
        options.ReplaceTinyPivot = YES;
        options.Trans = NOTRANS;
        options.IterRefine = DOUBLE;
        options.SolveInitialized = NO;
        options.RefineInitialized = NO;
        options.PrintStat = YES;
     */
    set_default_options_dist(&options);

    if (!iam) {
	print_sp_ienv_dist(&options);
	print_options_dist(&options);
    }

    /* Initialize ScalePermstruct and LUstruct. */
    ScalePermstructInit(m, n, &ScalePermstruct);
    LUstructInit(n, &LUstruct);

    /* Initialize the statistics variables. */
    PStatInit(&stat);

    /* Call the linear equation solver: factorize and solve. */
    pdgssvx(&options, &A, &ScalePermstruct, b, ldb, nrhs, &grid,
            &LUstruct, &SOLVEstruct, berr, &stat, &info);

    /* Check the accuracy of the solution. */
    pdinf_norm_error(iam, m_loc, nrhs, b, ldb, xtrue, ldx, &grid);
    
    PStatPrint(&options, &stat, &grid);        /* Print the statistics. */
    PStatFree(&stat);
    Destroy_CompRowLoc_Matrix_dist(&A); /* Deallocate storage of matrix A.  */
    SUPERLU_FREE(b);                 /* Free storage of right-hand side.    */


    /* ------------------------------------------------------------
       NOW WE SOLVE ANOTHER LINEAR SYSTEM.
       THE MATRIX A HAS THE SAME SPARSITY PATTERN AND THE SIMILAR
       NUMERICAL VALUES AS THAT IN A PREVIOUS SYSTEM.
       ------------------------------------------------------------*/
    options.Fact = SamePattern_SameRowPerm;
    PStatInit(&stat); /* Initialize the statistics variables. */

    /* Set up the local A in NR_loc format */
    dCreate_CompRowLoc_Matrix_dist(&A, m, n, nnz_loc, m_loc, fst_row,
				   nzval1, colind1, rowptr1,
				   SLU_NR_loc, SLU_D, SLU_GE);

    /* Solve the linear system. */
    pdgssvx(&options, &A, &ScalePermstruct, b1, ldb, nrhs, &grid,
            &LUstruct, &SOLVEstruct, berr, &stat, &info);

    /* Check the accuracy of the solution. */
    if ( !iam )
        printf("Solve a system with the same pattern and similar values.\n");
    pdinf_norm_error(iam, m_loc, nrhs, b1, ldb, xtrue, ldx, &grid);

    /* Print the statistics. */
    PStatPrint(&options, &stat, &grid);

    /* ------------------------------------------------------------
       DEALLOCATE STORAGE.
       ------------------------------------------------------------*/
    PStatFree(&stat);
    Destroy_CompRowLoc_Matrix_dist(&A); /* Deallocate storage of matrix A.  */
    Destroy_LU(n, &grid, &LUstruct); /* Deallocate storage associated with    
					the L and U matrices.               */
    ScalePermstructFree(&ScalePermstruct);
    LUstructFree(&LUstruct);         /* Deallocate the structure of L and U.*/
    if ( options.SolveInitialized ) {
        dSolveFinalize(&options, &SOLVEstruct);
    }
    SUPERLU_FREE(b1);	             /* Free storage of right-hand side.    */
    SUPERLU_FREE(xtrue);             /* Free storage of the exact solution. */
    SUPERLU_FREE(berr);


    /* ------------------------------------------------------------
       RELEASE THE SUPERLU PROCESS GRID.
       ------------------------------------------------------------*/
out:
    superlu_gridexit(&grid);

    /* ------------------------------------------------------------
       TERMINATES THE MPI EXECUTION ENVIRONMENT.
       ------------------------------------------------------------*/
    MPI_Finalize();

#if ( DEBUGlevel>=1 )
    CHECK_MALLOC(iam, "Exit main()");
#endif

}
Exemple #2
0
int main(int argc, char *argv[])
{
    superlu_dist_options_t options;
    SuperLUStat_t stat;
    SuperMatrix A;
    ScalePermstruct_t ScalePermstruct;
    LUstruct_t LUstruct;
    gridinfo_t grid1, grid2;
    double   *berr;
    double   *a, *b, *xtrue;
    int_t    *asub, *xa;
    int_t    i, j, m, n, nnz;
    int_t    nprow, npcol, ldumap, p;
    int_t    usermap[6];
    int      iam, info, ldb, ldx, nprocs;
    int      nrhs = 1;   /* Number of right-hand side. */
    char     trans[1];
    char     **cpp, c;
    FILE *fp, *fopen();

    /* prototypes */
    extern void LUstructInit(const int_t, LUstruct_t *);
    extern void LUstructFree(LUstruct_t *);
    extern void Destroy_LU(int_t, gridinfo_t *, LUstruct_t *);

    /* ------------------------------------------------------------
       INITIALIZE MPI ENVIRONMENT. 
       ------------------------------------------------------------*/
    MPI_Init( &argc, &argv );
    MPI_Comm_size( MPI_COMM_WORLD, &nprocs );
    if ( nprocs < 10 ) {
	fprintf(stderr, "Requires at least 10 processes\n");
	exit(-1);
    }

    /* Parse command line argv[]. */
    for (cpp = argv+1; *cpp; ++cpp) {
	if ( **cpp == '-' ) {
	    c = *(*cpp+1);
	    ++cpp;
	    switch (c) {
	      case 'h':
		  printf("Options:\n");
		  printf("\t-r <int>: process rows    (default %d)\n", nprow);
		  printf("\t-c <int>: process columns (default %d)\n", npcol);
		  exit(0);
		  break;
	      case 'r': nprow = atoi(*cpp);
		        break;
	      case 'c': npcol = atoi(*cpp);
		        break;
	    }
	} else { /* Last arg is considered a filename */
	    if ( !(fp = fopen(*cpp, "r")) ) {
                ABORT("File does not exist");
            }
	    break;
	}
    }

    /* ------------------------------------------------------------
       INITIALIZE THE SUPERLU PROCESS GRID 1. 
       ------------------------------------------------------------*/
    nprow = 2;
    npcol = 3;
    ldumap = 2;
    p = 0;    /* Grid 1 starts from process 0. */
    for (i = 0; i < nprow; ++i)
	for (j = 0; j < npcol; ++j) usermap[i+j*ldumap] = p++;
    superlu_gridmap(MPI_COMM_WORLD, nprow, npcol, usermap, ldumap, &grid1);

    /* ------------------------------------------------------------
       INITIALIZE THE SUPERLU PROCESS GRID 2. 
       ------------------------------------------------------------*/
    nprow = 2;
    npcol = 2;
    ldumap = 2;
    p = 6;   /* Grid 2 starts from process 6. */
    for (i = 0; i < nprow; ++i)
	for (j = 0; j < npcol; ++j) usermap[i+j*ldumap] = p++;
    superlu_gridmap(MPI_COMM_WORLD, nprow, npcol, usermap, ldumap, &grid2);

    /* Bail out if I do not belong in any of the 2 grids. */
    MPI_Comm_rank( MPI_COMM_WORLD, &iam );
    if ( iam >= 10 ) goto out;
    
#if ( DEBUGlevel>=1 )
    CHECK_MALLOC(iam, "Enter main()");
#endif

    if ( iam >= 0 && iam < 6 ) { /* I am in grid 1. */
	iam = grid1.iam;  /* Get the logical number in the new grid. */

	/* ------------------------------------------------------------
	   PROCESS 0 READS THE MATRIX A, AND THEN BROADCASTS IT TO ALL
	   THE OTHER PROCESSES.
	   ------------------------------------------------------------*/
	if ( !iam ) {
	    /* Read the matrix stored on disk in Harwell-Boeing format. */
	    dreadhb_dist(iam, fp, &m, &n, &nnz, &a, &asub, &xa);
	
	    printf("\tDimension\t%dx%d\t # nonzeros %d\n", m, n, nnz);
	    printf("\tProcess grid\t%d X %d\n", (int) grid1.nprow, (int) grid1.npcol);

	    /* Broadcast matrix A to the other PEs. */
	    MPI_Bcast( &m,   1,   mpi_int_t,  0, grid1.comm );
	    MPI_Bcast( &n,   1,   mpi_int_t,  0, grid1.comm );
	    MPI_Bcast( &nnz, 1,   mpi_int_t,  0, grid1.comm );
	    MPI_Bcast( a,    nnz, MPI_DOUBLE, 0, grid1.comm );
	    MPI_Bcast( asub, nnz, mpi_int_t,  0, grid1.comm );
	    MPI_Bcast( xa,   n+1, mpi_int_t,  0, grid1.comm );
	} else {
	    /* Receive matrix A from PE 0. */
	    MPI_Bcast( &m,   1,   mpi_int_t,  0, grid1.comm );
	    MPI_Bcast( &n,   1,   mpi_int_t,  0, grid1.comm );
	    MPI_Bcast( &nnz, 1,   mpi_int_t,  0, grid1.comm );

	    /* Allocate storage for compressed column representation. */
	    dallocateA_dist(n, nnz, &a, &asub, &xa);
	    
	    MPI_Bcast( a,    nnz, MPI_DOUBLE, 0, grid1.comm );
	    MPI_Bcast( asub, nnz, mpi_int_t,  0, grid1.comm );
	    MPI_Bcast( xa,   n+1, mpi_int_t,  0, grid1.comm );
	}
	
	/* Create compressed column matrix for A. */
	dCreate_CompCol_Matrix_dist(&A, m, n, nnz, a, asub, xa,
				    SLU_NC, SLU_D, SLU_GE);

	/* Generate the exact solution and compute the right-hand side. */
	if (!(b=doubleMalloc_dist(m*nrhs))) ABORT("Malloc fails for b[]");
	if (!(xtrue=doubleMalloc_dist(n*nrhs))) ABORT("Malloc fails for xtrue[]");
	*trans = 'N';
	ldx = n;
	ldb = m;
	dGenXtrue_dist(n, nrhs, xtrue, ldx);
	dFillRHS_dist(trans, nrhs, xtrue, ldx, &A, b, ldb);

	if ( !(berr = doubleMalloc_dist(nrhs)) )
	    ABORT("Malloc fails for berr[].");

	/* ------------------------------------------------------------
	   NOW WE SOLVE THE LINEAR SYSTEM.
	   ------------------------------------------------------------*/
	
        /* Set the default input options:
            options.Fact = DOFACT;
            options.Equil = YES;
            options.ColPerm = METIS_AT_PLUS_A;
            options.RowPerm = LargeDiag;
            options.ReplaceTinyPivot = YES;
            options.Trans = NOTRANS;
            options.IterRefine = DOUBLE;
            options.SolveInitialized = NO;
            options.RefineInitialized = NO;
            options.PrintStat = YES;
         */
	set_default_options_dist(&options);

        if (!iam) {
	    print_sp_ienv_dist(&options);
	    print_options_dist(&options);
        }

	/* Initialize ScalePermstruct and LUstruct. */
	ScalePermstructInit(m, n, &ScalePermstruct);
	LUstructInit(n, &LUstruct);

	/* Initialize the statistics variables. */
	PStatInit(&stat);
	
	/* Call the linear equation solver: factorize and solve. */
	pdgssvx_ABglobal(&options, &A, &ScalePermstruct, b, ldb, nrhs, &grid1,
			 &LUstruct, berr, &stat, &info);

	/* Check the accuracy of the solution. */
	if ( !iam ) {
	    dinf_norm_error_dist(n, nrhs, b, ldb, xtrue, ldx, &grid1);
	}
    
    
	/* Print the statistics. */
	PStatPrint(&options, &stat, &grid1);

	/* ------------------------------------------------------------
	   DEALLOCATE STORAGE.
	   ------------------------------------------------------------*/
	PStatFree(&stat);
	Destroy_CompCol_Matrix_dist(&A); 
	Destroy_LU(n, &grid1, &LUstruct);
	ScalePermstructFree(&ScalePermstruct);
	LUstructFree(&LUstruct);
	SUPERLU_FREE(b);
	SUPERLU_FREE(xtrue);
	SUPERLU_FREE(berr);

    } else { /* I am in grid 2. */
	iam = grid2.iam;  /* Get the logical number in the new grid. */

	/* ------------------------------------------------------------
	   PROCESS 0 READS THE MATRIX A, AND THEN BROADCASTS IT TO ALL
	   THE OTHER PROCESSES.
	   ------------------------------------------------------------*/
	if ( !iam ) {
	    /* Read the matrix stored on disk in Harwell-Boeing format. */
	    dreadhb_dist(iam, fp, &m, &n, &nnz, &a, &asub, &xa);
	
	    printf("\tDimension\t%dx%d\t # nonzeros %d\n", m, n, nnz);
	    printf("\tProcess grid\t%d X %d\n", (int) grid2.nprow, (int) grid2.npcol);

	    /* Broadcast matrix A to the other PEs. */
	    MPI_Bcast( &m,   1,   mpi_int_t,  0, grid2.comm );
	    MPI_Bcast( &n,   1,   mpi_int_t,  0, grid2.comm );
	    MPI_Bcast( &nnz, 1,   mpi_int_t,  0, grid2.comm );
	    MPI_Bcast( a,    nnz, MPI_DOUBLE, 0, grid2.comm );
	    MPI_Bcast( asub, nnz, mpi_int_t,  0, grid2.comm );
	    MPI_Bcast( xa,   n+1, mpi_int_t,  0, grid2.comm );
	} else {
	    /* Receive matrix A from PE 0. */
	    MPI_Bcast( &m,   1,   mpi_int_t,  0, grid2.comm );
	    MPI_Bcast( &n,   1,   mpi_int_t,  0, grid2.comm );
	    MPI_Bcast( &nnz, 1,   mpi_int_t,  0, grid2.comm );

	    /* Allocate storage for compressed column representation. */
	    dallocateA_dist(n, nnz, &a, &asub, &xa);
	    
	    MPI_Bcast( a,    nnz, MPI_DOUBLE, 0, grid2.comm );
	    MPI_Bcast( asub, nnz, mpi_int_t,  0, grid2.comm );
	    MPI_Bcast( xa,   n+1, mpi_int_t,  0, grid2.comm );
	}
	
	/* Create compressed column matrix for A. */
	dCreate_CompCol_Matrix_dist(&A, m, n, nnz, a, asub, xa,
				    SLU_NC, SLU_D, SLU_GE);

	/* Generate the exact solution and compute the right-hand side. */
	if (!(b=doubleMalloc_dist(m*nrhs))) ABORT("Malloc fails for b[]");
	if (!(xtrue=doubleMalloc_dist(n*nrhs))) ABORT("Malloc fails for xtrue[]");
	*trans = 'N';
	ldx = n;
	ldb = m;
	dGenXtrue_dist(n, nrhs, xtrue, ldx);
	dFillRHS_dist(trans, nrhs, xtrue, ldx, &A, b, ldb);

	if ( !(berr = doubleMalloc_dist(nrhs)) )
	    ABORT("Malloc fails for berr[].");

	/* ------------------------------------------------------------
	   NOW WE SOLVE THE LINEAR SYSTEM.
	   ------------------------------------------------------------*/
	
        /* Set the default input options:
            options.Fact = DOFACT;
            options.Equil = YES;
            options.ColPerm = MMD_AT_PLUS_A;
            options.RowPerm = LargeDiag;
            options.ReplaceTinyPivot = YES;
            options.Trans = NOTRANS;
            options.IterRefine = DOUBLE;
            options.SolveInitialized = NO;
            options.RefineInitialized = NO;
            options.PrintStat = YES;
         */
	set_default_options_dist(&options);
	
	/* Initialize ScalePermstruct and LUstruct. */
	ScalePermstructInit(m, n, &ScalePermstruct);
	LUstructInit(n, &LUstruct);

	/* Initialize the statistics variables. */
	PStatInit(&stat);
	
	/* Call the linear equation solver: factorize and solve. */
	pdgssvx_ABglobal(&options, &A, &ScalePermstruct, b, ldb, nrhs, &grid2,
			 &LUstruct, berr, &stat, &info);

	/* Check the accuracy of the solution. */
	if ( !iam ) {
	    dinf_norm_error_dist(n, nrhs, b, ldb, xtrue, ldx, &grid2);
	}
    
    
	/* Print the statistics. */
	PStatPrint(&options, &stat, &grid2);

	/* ------------------------------------------------------------
	   DEALLOCATE STORAGE.
	   ------------------------------------------------------------*/
	PStatFree(&stat);
	Destroy_CompCol_Matrix_dist(&A); 
	Destroy_LU(n, &grid2, &LUstruct);
	ScalePermstructFree(&ScalePermstruct);
	LUstructFree(&LUstruct);
	SUPERLU_FREE(b);
	SUPERLU_FREE(xtrue);
	SUPERLU_FREE(berr);
    }

    /* ------------------------------------------------------------
       RELEASE THE SUPERLU PROCESS GRIDS.
       ------------------------------------------------------------*/
    superlu_gridexit(&grid1);
    superlu_gridexit(&grid2);

out:
    /* ------------------------------------------------------------
       TERMINATES THE MPI EXECUTION ENVIRONMENT.
       ------------------------------------------------------------*/
    MPI_Finalize();

#if ( DEBUGlevel>=1 )
    CHECK_MALLOC(iam, "Exit main()");
#endif

}
int main(int argc, char *argv[])
{
    superlu_dist_options_t options;
    SuperLUStat_t stat;
    SuperMatrix A;
    ScalePermstruct_t ScalePermstruct;
    LUstruct_t LUstruct;
    gridinfo_t grid;
    double   *berr;
    doublecomplex   *a, *b, *xtrue;
    int_t    *asub, *xa;
    int_t    m, n, nnz;
    int_t    nprow, npcol;
    int      iam, info, ldb, ldx, nrhs;
    char     trans[1];
    char     **cpp, c;
    FILE *fp, *fopen();
    extern int cpp_defs();

    /* prototypes */
    extern void LUstructInit(const int_t, LUstruct_t *);
    extern void LUstructFree(LUstruct_t *);
    extern void Destroy_LU(int_t, gridinfo_t *, LUstruct_t *);

    nprow = 1;  /* Default process rows.      */
    npcol = 1;  /* Default process columns.   */
    nrhs = 1;   /* Number of right-hand side. */

    /* ------------------------------------------------------------
       INITIALIZE MPI ENVIRONMENT. 
       ------------------------------------------------------------*/
    MPI_Init( &argc, &argv );

    /* Parse command line argv[]. */
    for (cpp = argv+1; *cpp; ++cpp) {
	if ( **cpp == '-' ) {
	    c = *(*cpp+1);
	    ++cpp;
	    switch (c) {
	      case 'h':
		  printf("Options:\n");
		  printf("\t-r <int>: process rows    (default " IFMT ")\n", nprow);
		  printf("\t-c <int>: process columns (default " IFMT ")\n", npcol);
		  exit(0);
		  break;
	      case 'r': nprow = atoi(*cpp);
		        break;
	      case 'c': npcol = atoi(*cpp);
		        break;
	    }
	} else { /* Last arg is considered a filename */
	    if ( !(fp = fopen(*cpp, "r")) ) {
                ABORT("File does not exist");
            }
	    break;
	}
    }

    /* ------------------------------------------------------------
       INITIALIZE THE SUPERLU PROCESS GRID. 
       ------------------------------------------------------------*/
    superlu_gridinit(MPI_COMM_WORLD, nprow, npcol, &grid);

    /* Bail out if I do not belong in the grid. */
    iam = grid.iam;
    if ( iam >= nprow * npcol )
	goto out;


#if ( DEBUGlevel>=1 )
    CHECK_MALLOC(iam, "Enter main()");
#endif
    
    /* ------------------------------------------------------------
       PROCESS 0 READS THE MATRIX A, AND THEN BROADCASTS IT TO ALL
       THE OTHER PROCESSES.
       ------------------------------------------------------------*/
    if ( !iam ) {
	/* Print the CPP definitions. */
	cpp_defs();
	
	/* Read the matrix stored on disk in Harwell-Boeing format. */
	zreadhb_dist(iam, fp, &m, &n, &nnz, &a, &asub, &xa);
	
	printf("Input matrix file: %s\n", *cpp);
	printf("\tDimension\t" IFMT "x" IFMT "\t # nonzeros " IFMT "\n", m, n, nnz);
	printf("\tProcess grid\t%d X %d\n", (int) grid.nprow, (int) grid.npcol);

	/* Broadcast matrix A to the other PEs. */
	MPI_Bcast( &m,   1,   mpi_int_t,  0, grid.comm );
	MPI_Bcast( &n,   1,   mpi_int_t,  0, grid.comm );
	MPI_Bcast( &nnz, 1,   mpi_int_t,  0, grid.comm );
	MPI_Bcast( a,    nnz, SuperLU_MPI_DOUBLE_COMPLEX, 0, grid.comm );
	MPI_Bcast( asub, nnz, mpi_int_t,  0, grid.comm );
	MPI_Bcast( xa,   n+1, mpi_int_t,  0, grid.comm );
    } else {
	/* Receive matrix A from PE 0. */
	MPI_Bcast( &m,   1,   mpi_int_t,  0, grid.comm );
	MPI_Bcast( &n,   1,   mpi_int_t,  0, grid.comm );
	MPI_Bcast( &nnz, 1,   mpi_int_t,  0, grid.comm );

	/* Allocate storage for compressed column representation. */
	zallocateA_dist(n, nnz, &a, &asub, &xa);

	MPI_Bcast( a,    nnz, SuperLU_MPI_DOUBLE_COMPLEX, 0, grid.comm );
	MPI_Bcast( asub, nnz, mpi_int_t,  0, grid.comm );
	MPI_Bcast( xa,   n+1, mpi_int_t,  0, grid.comm );
    }
	
    /* Create compressed column matrix for A. */
    zCreate_CompCol_Matrix_dist(&A, m, n, nnz, a, asub, xa,
				SLU_NC, SLU_Z, SLU_GE);

    /* Generate the exact solution and compute the right-hand side. */
    if (!(b=doublecomplexMalloc_dist(m*nrhs))) ABORT("Malloc fails for b[]");
    if (!(xtrue=doublecomplexMalloc_dist(n*nrhs))) ABORT("Malloc fails for xtrue[]");
    *trans = 'N';
    ldx = n;
    ldb = m;
    zGenXtrue_dist(n, nrhs, xtrue, ldx);
    zFillRHS_dist(trans, nrhs, xtrue, ldx, &A, b, ldb);

    if ( !(berr = doubleMalloc_dist(nrhs)) )
	ABORT("Malloc fails for berr[].");

    /* ------------------------------------------------------------
       NOW WE SOLVE THE LINEAR SYSTEM.
       ------------------------------------------------------------*/

    /* Set the default input options:
        options.Fact = DOFACT;
        options.Equil = YES;
        options.ColPerm = METIS_AT_PLUS_A;
        options.RowPerm = LargeDiag_MC64;
        options.ReplaceTinyPivot = YES;
        options.Trans = NOTRANS;
        options.IterRefine = DOUBLE;
        options.SolveInitialized = NO;
        options.RefineInitialized = NO;
        options.PrintStat = YES;
     */
    set_default_options_dist(&options);

    if (!iam) {
	print_sp_ienv_dist(&options);
	print_options_dist(&options);
    }

    /* Initialize ScalePermstruct and LUstruct. */
    ScalePermstructInit(m, n, &ScalePermstruct);
    LUstructInit(n, &LUstruct);

    /* Initialize the statistics variables. */
    PStatInit(&stat);

    /* Call the linear equation solver. */
    pzgssvx_ABglobal(&options, &A, &ScalePermstruct, b, ldb, nrhs, &grid,
		     &LUstruct, berr, &stat, &info);

    /* Check the accuracy of the solution. */
    if ( !iam ) {
	zinf_norm_error_dist(n, nrhs, b, ldb, xtrue, ldx, &grid);
    }
    PStatPrint(&options, &stat, &grid);        /* Print the statistics. */

    /* ------------------------------------------------------------
       DEALLOCATE STORAGE.
       ------------------------------------------------------------*/
    PStatFree(&stat);
    Destroy_CompCol_Matrix_dist(&A);
    Destroy_LU(n, &grid, &LUstruct);
    ScalePermstructFree(&ScalePermstruct);
    LUstructFree(&LUstruct);
    SUPERLU_FREE(b);
    SUPERLU_FREE(xtrue);
    SUPERLU_FREE(berr);

    /* ------------------------------------------------------------
       RELEASE THE SUPERLU PROCESS GRID.
       ------------------------------------------------------------*/
out:
    superlu_gridexit(&grid);

    /* ------------------------------------------------------------
       TERMINATES THE MPI EXECUTION ENVIRONMENT.
       ------------------------------------------------------------*/
    MPI_Finalize();

#if ( DEBUGlevel>=1 )
    CHECK_MALLOC(iam, "Exit main()");
#endif

}
Exemple #4
0
int main(int argc, char *argv[])
{
    superlu_dist_options_t options;
    SuperLUStat_t stat;
    SuperMatrix A;
    ScalePermstruct_t ScalePermstruct;
    LUstruct_t LUstruct;
    gridinfo_t grid;
    double   *berr;
    double   *a, *a1, *b, *b1, *xtrue;
    int_t    *asub, *asub1, *xa, *xa1;
    int_t    i, j, m, n, nnz;
    int_t    nprow, npcol;
    int      iam, info, ldb, ldx, nrhs;
    char     trans[1];
    char     **cpp, c;
    FILE *fp, *fopen();
    extern int cpp_defs();

    /* prototypes */
    extern void LUstructInit(const int_t, LUstruct_t *);
    extern void LUstructFree(LUstruct_t *);
    extern void Destroy_LU(int_t, gridinfo_t *, LUstruct_t *);

    nprow = 1;  /* Default process rows.      */
    npcol = 1;  /* Default process columns.   */
    nrhs = 1;   /* Number of right-hand side. */

    /* ------------------------------------------------------------
       INITIALIZE MPI ENVIRONMENT. 
       ------------------------------------------------------------*/
    MPI_Init( &argc, &argv );

    /* Parse command line argv[]. */
    for (cpp = argv+1; *cpp; ++cpp) {
	if ( **cpp == '-' ) {
	    c = *(*cpp+1);
	    ++cpp;
	    switch (c) {
	      case 'h':
		  printf("Options:\n");
		  printf("\t-r <int>: process rows    (default %d)\n", nprow);
		  printf("\t-c <int>: process columns (default %d)\n", npcol);
		  exit(0);
		  break;
	      case 'r': nprow = atoi(*cpp);
		        break;
	      case 'c': npcol = atoi(*cpp);
		        break;
	    }
	} else { /* Last arg is considered a filename */
	    if ( !(fp = fopen(*cpp, "r")) ) {
                ABORT("File does not exist");
            }
	    break;
	}
    }

    /* ------------------------------------------------------------
       INITIALIZE THE SUPERLU PROCESS GRID. 
       ------------------------------------------------------------*/
    superlu_gridinit(MPI_COMM_WORLD, nprow, npcol, &grid);

    /* Bail out if I do not belong in the grid. */
    iam = grid.iam;
    if ( iam >= nprow * npcol )
	goto out;
    
#if ( DEBUGlevel>=1 )
    CHECK_MALLOC(iam, "Enter main()");
#endif

    /* ------------------------------------------------------------
       Process 0 reads the matrix A, and then broadcasts it to all
       the other processes.
       ------------------------------------------------------------*/
    if ( !iam ) {
	/* Print the CPP definitions. */
	cpp_defs();
	
	/* Read the matrix stored on disk in Harwell-Boeing format. */
	dreadhb_dist(iam, fp, &m, &n, &nnz, &a, &asub, &xa);
	
	printf("Input matrix file: %s\n", *cpp);
	printf("\tDimension\t%dx%d\t # nonzeros %d\n", m, n, nnz);
	printf("\tProcess grid\t%d X %d\n", (int) grid.nprow, (int) grid.npcol);

	/* Broadcast matrix A to the other PEs. */
	MPI_Bcast( &m,   1,   mpi_int_t,  0, grid.comm );
	MPI_Bcast( &n,   1,   mpi_int_t,  0, grid.comm );
	MPI_Bcast( &nnz, 1,   mpi_int_t,  0, grid.comm );
	MPI_Bcast( a,    nnz, MPI_DOUBLE, 0, grid.comm );
	MPI_Bcast( asub, nnz, mpi_int_t,  0, grid.comm );
	MPI_Bcast( xa,   n+1, mpi_int_t,  0, grid.comm );
    } else {
	/* Receive matrix A from PE 0. */
	MPI_Bcast( &m,   1,   mpi_int_t,  0, grid.comm );
	MPI_Bcast( &n,   1,   mpi_int_t,  0, grid.comm );
	MPI_Bcast( &nnz, 1,   mpi_int_t,  0, grid.comm );

	/* Allocate storage for compressed column representation. */
	dallocateA_dist(n, nnz, &a, &asub, &xa);

	MPI_Bcast( a,    nnz, MPI_DOUBLE, 0, grid.comm );
	MPI_Bcast( asub, nnz, mpi_int_t,  0, grid.comm );
	MPI_Bcast( xa,   n+1, mpi_int_t,  0, grid.comm );
    }
	
    /* Create compressed column matrix for A. */
    dCreate_CompCol_Matrix_dist(&A, m, n, nnz, a, asub, xa,
				SLU_NC, SLU_D, SLU_GE);

    /* Generate the exact solution and compute the right-hand side. */
    if (!(b=doubleMalloc_dist(m * nrhs))) ABORT("Malloc fails for b[]");
    if (!(xtrue=doubleMalloc_dist(n*nrhs))) ABORT("Malloc fails for xtrue[]");
    *trans = 'N';
    ldx = n;
    ldb = m;
    dGenXtrue_dist(n, nrhs, xtrue, ldx);
    dFillRHS_dist(trans, nrhs, xtrue, ldx, &A, b, ldb);

    /* Save a copy of the right-hand side. */  
    if ( !(b1 = doubleMalloc_dist(m * nrhs)) ) ABORT("Malloc fails for b1[]");
    for (j = 0; j < nrhs; ++j)
	for (i = 0; i < m; ++i) b1[i+j*ldb] = b[i+j*ldb];
    
    if ( !(berr = doubleMalloc_dist(nrhs)) )
	ABORT("Malloc fails for berr[].");

    /* Save a copy of the matrix A. */
    dallocateA_dist(n, nnz, &a1, &asub1, &xa1);
    for (i = 0; i < nnz; ++i) { a1[i] = a[i]; asub1[i] = asub[i]; }
    for (i = 0; i < n+1; ++i) xa1[i] = xa[i];


    /* ------------------------------------------------------------
       WE SOLVE THE LINEAR SYSTEM FOR THE FIRST TIME.
       ------------------------------------------------------------*/

    /* Set the default input options:
        options.Fact = DOFACT;
        options.Equil = YES;
        options.ColPerm = METIS_AT_PLUS_A;
        options.RowPerm = LargeDiag;
        options.ReplaceTinyPivot = YES;
        options.Trans = NOTRANS;
        options.IterRefine = DOUBLE;
        options.SolveInitialized = NO;
        options.RefineInitialized = NO;
        options.PrintStat = YES;
     */
    set_default_options_dist(&options);

    if (!iam) {
	print_sp_ienv_dist(&options);
	print_options_dist(&options);
    }

    /* Initialize ScalePermstruct and LUstruct. */
    ScalePermstructInit(m, n, &ScalePermstruct);
    LUstructInit(n, &LUstruct);

    /* Initialize the statistics variables. */
    PStatInit(&stat);

    /* Call the linear equation solver: factorize and solve. */
    pdgssvx_ABglobal(&options, &A, &ScalePermstruct, b, ldb, nrhs, &grid,
		     &LUstruct, berr, &stat, &info);

    /* Check the accuracy of the solution. */
    if ( !iam ) {
	dinf_norm_error_dist(n, nrhs, b, ldb, xtrue, ldx, &grid);
    }
    
    PStatPrint(&options, &stat, &grid);        /* Print the statistics. */
    PStatFree(&stat);
    Destroy_CompCol_Matrix_dist(&A); /* Deallocate storage of matrix A.     */
    Destroy_LU(n, &grid, &LUstruct); /* Deallocate storage associated with 
					the L and U matrices.               */
    SUPERLU_FREE(b);                 /* Free storage of right-hand side.    */


    /* ------------------------------------------------------------
       NOW WE SOLVE ANOTHER LINEAR SYSTEM.
       ONLY THE SPARSITY PATTERN OF MATRIX A IS THE SAME.
       ------------------------------------------------------------*/
    options.Fact = SamePattern;
    PStatInit(&stat); /* Initialize the statistics variables. */

    /* Create compressed column matrix for A. */
    dCreate_CompCol_Matrix_dist(&A, m, n, nnz, a1, asub1, xa1,
				SLU_NC, SLU_D, SLU_GE);

    /* Solve the linear system. */
    pdgssvx_ABglobal(&options, &A, &ScalePermstruct, b1, ldb, nrhs, &grid,
		     &LUstruct, berr, &stat, &info);

    /* Check the accuracy of the solution. */
    if ( !iam ) {
	printf("Solve the system with the same sparsity pattern.\n");
	dinf_norm_error_dist(n, nrhs, b1, ldb, xtrue, ldx, &grid);
    }

    /* Print the statistics. */
    PStatPrint(&options, &stat, &grid);

    /* ------------------------------------------------------------
       DEALLOCATE STORAGE.
       ------------------------------------------------------------*/
    PStatFree(&stat);
    Destroy_CompCol_Matrix_dist(&A); /* Deallocate storage of matrix A.     */
    Destroy_LU(n, &grid, &LUstruct); /* Deallocate storage associated with    
					the L and U matrices.               */
    ScalePermstructFree(&ScalePermstruct);
    LUstructFree(&LUstruct);         /* Deallocate the structure of L and U.*/
    SUPERLU_FREE(b1);	             /* Free storage of right-hand side.    */
    SUPERLU_FREE(xtrue);             /* Free storage of the exact solution. */
    SUPERLU_FREE(berr);


    /* ------------------------------------------------------------
       RELEASE THE SUPERLU PROCESS GRID.
       ------------------------------------------------------------*/
out:
    superlu_gridexit(&grid);

    /* ------------------------------------------------------------
       TERMINATES THE MPI EXECUTION ENVIRONMENT.
       ------------------------------------------------------------*/
    MPI_Finalize();

#if ( DEBUGlevel>=1 )
    CHECK_MALLOC(iam, "Exit main()");
#endif

}
Exemple #5
0
int main(int argc, char *argv[])
{
    superlu_dist_options_t options;
    SuperLUStat_t stat;
    SuperMatrix A;
    ScalePermstruct_t ScalePermstruct;
    LUstruct_t LUstruct;
    SOLVEstruct_t SOLVEstruct;
    gridinfo_t grid1, grid2;
    double   *berr;
    double   *a, *b, *xtrue;
    int_t    *asub, *xa;
    int_t    i, j, m, n;
    int      nprow, npcol, ldumap, p;
    int_t    usermap[6];
    int      iam, info, ldb, ldx, nprocs;
    int      nrhs = 1;   /* Number of right-hand side. */
    char     **cpp, c;
    FILE *fp, *fopen();
    int cpp_defs();


    /* ------------------------------------------------------------
       INITIALIZE MPI ENVIRONMENT. 
       ------------------------------------------------------------*/
    MPI_Init( &argc, &argv );
    MPI_Comm_size( MPI_COMM_WORLD, &nprocs );
    if ( nprocs < 10 ) {
	fprintf(stderr, "Requires at least 10 processes\n");
	exit(-1);
    }

    /* Parse command line argv[]. */
    for (cpp = argv+1; *cpp; ++cpp) {
	if ( **cpp == '-' ) {
	    c = *(*cpp+1);
	    ++cpp;
	    switch (c) {
	      case 'h':
		  printf("Options:\n");
		  printf("\t-r <int>: process rows    (default %d)\n", nprow);
		  printf("\t-c <int>: process columns (default %d)\n", npcol);
		  exit(0);
		  break;
	      case 'r': nprow = atoi(*cpp);
		        break;
	      case 'c': npcol = atoi(*cpp);
		        break;
	    }
	} else { /* Last arg is considered a filename */
	    if ( !(fp = fopen(*cpp, "r")) ) {
                ABORT("File does not exist");
            }
	    break;
	}
    }

    /* ------------------------------------------------------------
       INITIALIZE THE SUPERLU PROCESS GRID 1. 
       ------------------------------------------------------------*/
    nprow = 2;
    npcol = 3;
    ldumap = 2;
    p = 0;    /* Grid 1 starts from process 0. */
    for (i = 0; i < nprow; ++i)
	for (j = 0; j < npcol; ++j) usermap[i+j*ldumap] = p++;
    superlu_gridmap(MPI_COMM_WORLD, nprow, npcol, usermap, ldumap, &grid1);

    /* ------------------------------------------------------------
       INITIALIZE THE SUPERLU PROCESS GRID 2. 
       ------------------------------------------------------------*/
    nprow = 2;
    npcol = 2;
    ldumap = 2;
    p = 6;   /* Grid 2 starts from process 6. */
    for (i = 0; i < nprow; ++i)
	for (j = 0; j < npcol; ++j) usermap[i+j*ldumap] = p++;
    superlu_gridmap(MPI_COMM_WORLD, nprow, npcol, usermap, ldumap, &grid2);

    /* Bail out if I do not belong in any of the 2 grids. */
    MPI_Comm_rank( MPI_COMM_WORLD, &iam );
    if ( iam >= 10 ) goto out;
    
#if ( DEBUGlevel>=1 )
    CHECK_MALLOC(iam, "Enter main()");
#endif

    if ( iam >= 0 && iam < 6 ) { /* I am in grid 1. */
	iam = grid1.iam;  /* Get the logical number in the new grid. */

        /* ------------------------------------------------------------
           GET THE MATRIX FROM FILE AND SETUP THE RIGHT HAND SIDE. 
           ------------------------------------------------------------*/
        dcreate_matrix(&A, nrhs, &b, &ldb, &xtrue, &ldx, fp, &grid1);
	
	if ( !(berr = doubleMalloc_dist(nrhs)) )
	    ABORT("Malloc fails for berr[].");

	/* ------------------------------------------------------------
	   NOW WE SOLVE THE LINEAR SYSTEM.
	   ------------------------------------------------------------*/
	
        /* Set the default input options:
            options.Fact = DOFACT;
            options.Equil = YES;
            options.ColPerm = METIS_AT_PLUS_A;
            options.RowPerm = LargeDiag;
            options.ReplaceTinyPivot = NO;
            options.Trans = NOTRANS;
            options.IterRefine = DOUBLE;
            options.SolveInitialized = NO;
            options.RefineInitialized = NO;
            options.PrintStat = YES;
         */
	set_default_options_dist(&options);

        if (!iam) {
	    print_sp_ienv_dist(&options);
    	    print_options_dist(&options);
        }

        m = A.nrow;
        n = A.ncol;

	/* Initialize ScalePermstruct and LUstruct. */
	ScalePermstructInit(m, n, &ScalePermstruct);
	LUstructInit(n, &LUstruct);

	/* Initialize the statistics variables. */
	PStatInit(&stat);
	
	/* Call the linear equation solver. */
	pdgssvx(&options, &A, &ScalePermstruct, b, ldb, nrhs, &grid1,
                &LUstruct, &SOLVEstruct, berr, &stat, &info);

        /* Check the accuracy of the solution. */
        pdinf_norm_error(iam, ((NRformat_loc *)A.Store)->m_loc,
                         nrhs, b, ldb, xtrue, ldx, &grid1);
    
	/* Print the statistics. */
	PStatPrint(&options, &stat, &grid1);

	/* ------------------------------------------------------------
	   DEALLOCATE STORAGE.
	   ------------------------------------------------------------*/
	PStatFree(&stat);
        Destroy_CompRowLoc_Matrix_dist(&A);
        ScalePermstructFree(&ScalePermstruct);
	Destroy_LU(n, &grid1, &LUstruct);
	LUstructFree(&LUstruct);
        if ( options.SolveInitialized ) {
            dSolveFinalize(&options, &SOLVEstruct);
        }
	SUPERLU_FREE(b);
	SUPERLU_FREE(xtrue);
	SUPERLU_FREE(berr);

    } else { /* I am in grid 2. */
	iam = grid2.iam;  /* Get the logical number in the new grid. */

        /* ------------------------------------------------------------
           GET THE MATRIX FROM FILE AND SETUP THE RIGHT HAND SIDE. 
           ------------------------------------------------------------*/
        dcreate_matrix(&A, nrhs, &b, &ldb, &xtrue, &ldx, fp, &grid2);

	if ( !(berr = doubleMalloc_dist(nrhs)) )
	    ABORT("Malloc fails for berr[].");

	/* ------------------------------------------------------------
	   NOW WE SOLVE THE LINEAR SYSTEM.
	   ------------------------------------------------------------*/
	
        /* Set the default input options:
            options.Fact = DOFACT;
            options.Equil = YES;
            options.ColPerm = MMD_AT_PLUS_A;
            options.RowPerm = LargeDiag;
            options.ReplaceTinyPivot = YES;
            options.Trans = NOTRANS;
            options.IterRefine = DOUBLE;
            options.SolveInitialized = NO;
            options.RefineInitialized = NO;
            options.PrintStat = YES;
         */
	set_default_options_dist(&options);
	
        m = A.nrow;
        n = A.ncol;

	/* Initialize ScalePermstruct and LUstruct. */
	ScalePermstructInit(m, n, &ScalePermstruct);
	LUstructInit(n, &LUstruct);

	/* Initialize the statistics variables. */
	PStatInit(&stat);
	
	/* Call the linear equation solver. */
	pdgssvx(&options, &A, &ScalePermstruct, b, ldb, nrhs, &grid2,
                &LUstruct, &SOLVEstruct, berr, &stat, &info);

        /* Check the accuracy of the solution. */
        pdinf_norm_error(iam, ((NRformat_loc *)A.Store)->m_loc,
                         nrhs, b, ldb, xtrue, ldx, &grid2);
    
	/* Print the statistics. */
	PStatPrint(&options, &stat, &grid2);

	/* ------------------------------------------------------------
	   DEALLOCATE STORAGE.
	   ------------------------------------------------------------*/
	PStatFree(&stat);
        Destroy_CompRowLoc_Matrix_dist(&A);
        ScalePermstructFree(&ScalePermstruct);
	Destroy_LU(n, &grid2, &LUstruct);
	LUstructFree(&LUstruct);
        if ( options.SolveInitialized ) {
            dSolveFinalize(&options, &SOLVEstruct);
        }
	SUPERLU_FREE(b);
	SUPERLU_FREE(xtrue);
	SUPERLU_FREE(berr);
    }

    /* ------------------------------------------------------------
       RELEASE THE SUPERLU PROCESS GRIDS.
       ------------------------------------------------------------*/
    superlu_gridexit(&grid1);
    superlu_gridexit(&grid2);

out:
    /* ------------------------------------------------------------
       TERMINATES THE MPI EXECUTION ENVIRONMENT.
       ------------------------------------------------------------*/
    MPI_Finalize();

#if ( DEBUGlevel>=1 )
    CHECK_MALLOC(iam, "Exit main()");
#endif

}
Exemple #6
0
/*! \brief
 *
 * <pre>
 * Purpose
 * =======
 *
 * The driver program PDDRIVE1.
 *
 * This example illustrates how to use PDGSSVX to
 * solve systems with the same A but different right-hand side.
 * In this case, we factorize A only once in the first call to
 * PDGSSVX, and reuse the following data structures
 * in the subsequent call to PDGSSVX:
 *        ScalePermstruct  : DiagScale, R, C, perm_r, perm_c
 *        LUstruct         : Glu_persist, Llu
 * 
 * With MPICH,  program may be run by typing:
 *    mpiexec -n <np> pddrive1 -r <proc rows> -c <proc columns> big.rua
 * </pre>
 */
int main(int argc, char *argv[])
{
    superlu_dist_options_t options;
    SuperLUStat_t stat;
    SuperMatrix A;
    ScalePermstruct_t ScalePermstruct;
    LUstruct_t LUstruct;
    SOLVEstruct_t SOLVEstruct;
    gridinfo_t grid;
    double   *berr;
    double   *b, *xtrue, *b1;
    int    i, j, m, n;
    int    nprow, npcol;
    int    iam, info, ldb, ldx, nrhs;
    char     **cpp, c, *postfix;
    int ii, omp_mpi_level;
    FILE *fp, *fopen();
    int cpp_defs();

    nprow = 1;  /* Default process rows.      */
    npcol = 1;  /* Default process columns.   */
    nrhs = 1;   /* Number of right-hand side. */

    /* ------------------------------------------------------------
       INITIALIZE MPI ENVIRONMENT. 
       ------------------------------------------------------------*/
    MPI_Init_thread( &argc, &argv, MPI_THREAD_MULTIPLE, &omp_mpi_level); 

    /* Parse command line argv[]. */
    for (cpp = argv+1; *cpp; ++cpp) {
	if ( **cpp == '-' ) {
	    c = *(*cpp+1);
	    ++cpp;
	    switch (c) {
	      case 'h':
		  printf("Options:\n");
		  printf("\t-r <int>: process rows    (default %d)\n", nprow);
		  printf("\t-c <int>: process columns (default %d)\n", npcol);
		  exit(0);
		  break;
	      case 'r': nprow = atoi(*cpp);
		        break;
	      case 'c': npcol = atoi(*cpp);
		        break;
	    }
	} else { /* Last arg is considered a filename */
	    if ( !(fp = fopen(*cpp, "r")) ) {
                ABORT("File does not exist");
            }
	    break;
	}
    }

    /* ------------------------------------------------------------
       INITIALIZE THE SUPERLU PROCESS GRID. 
       ------------------------------------------------------------*/
    superlu_gridinit(MPI_COMM_WORLD, nprow, npcol, &grid);

    /* Bail out if I do not belong in the grid. */
    iam = grid.iam;
    if ( iam >= nprow * npcol )	goto out;
    if ( !iam ) {
	int v_major, v_minor, v_bugfix;
#ifdef __INTEL_COMPILER
	printf("__INTEL_COMPILER is defined\n");
#endif
	printf("__STDC_VERSION__ %ld\n", __STDC_VERSION__);

	superlu_dist_GetVersionNumber(&v_major, &v_minor, &v_bugfix);
	printf("Library version:\t%d.%d.%d\n", v_major, v_minor, v_bugfix);

	printf("Input matrix file:\t%s\n", *cpp);
        printf("Process grid:\t\t%d X %d\n", (int)grid.nprow, (int)grid.npcol);
	fflush(stdout);
    }

#if ( VAMPIR>=1 )
    VT_traceoff();
#endif

#if ( DEBUGlevel>=1 )
    CHECK_MALLOC(iam, "Enter main()");
#endif

    for(ii = 0;ii<strlen(*cpp);ii++){
	if((*cpp)[ii]=='.'){
		postfix = &((*cpp)[ii+1]);
	}
    }	
    // printf("%s\n", postfix);

    /* ------------------------------------------------------------
       GET THE MATRIX FROM FILE AND SETUP THE RIGHT HAND SIDE. 
       ------------------------------------------------------------*/
    dcreate_matrix_postfix(&A, nrhs, &b, &ldb, &xtrue, &ldx, fp, postfix, &grid);
    if ( !(b1 = doubleMalloc_dist(ldb * nrhs)) )
        ABORT("Malloc fails for b1[]");
    for (j = 0; j < nrhs; ++j)
        for (i = 0; i < ldb; ++i) b1[i+j*ldb] = b[i+j*ldb];

    if ( !(berr = doubleMalloc_dist(nrhs)) )
	ABORT("Malloc fails for berr[].");

    /* ------------------------------------------------------------
       WE SOLVE THE LINEAR SYSTEM FOR THE FIRST TIME.
       ------------------------------------------------------------*/

    /* Set the default input options:
        options.Fact = DOFACT;
        options.Equil = YES;
        options.ColPerm = METIS_AT_PLUS_A;
        options.RowPerm = LargeDiag_MC64;
        options.ReplaceTinyPivot = NO;
        options.Trans = NOTRANS;
        options.IterRefine = DOUBLE;
        options.SolveInitialized = NO;
        options.RefineInitialized = NO;
        options.PrintStat = YES;
     */
    set_default_options_dist(&options);

    if (!iam) {
	print_sp_ienv_dist(&options);
	print_options_dist(&options);
	fflush(stdout);
    }

    m = A.nrow;
    n = A.ncol;

    /* Initialize ScalePermstruct and LUstruct. */
    ScalePermstructInit(m, n, &ScalePermstruct);
    LUstructInit(n, &LUstruct);

    /* Initialize the statistics variables. */
    PStatInit(&stat);

    /* Call the linear equation solver. */
    pdgssvx(&options, &A, &ScalePermstruct, b, ldb, nrhs, &grid,
	    &LUstruct, &SOLVEstruct, berr, &stat, &info);


    /* Check the accuracy of the solution. */
    if ( !iam ) printf("\tSolve the first system:\n");
    pdinf_norm_error(iam, ((NRformat_loc *)A.Store)->m_loc,
		     nrhs, b, ldb, xtrue, ldx, &grid);

    PStatPrint(&options, &stat, &grid);        /* Print the statistics. */
    PStatFree(&stat);

    /* ------------------------------------------------------------
       NOW WE SOLVE ANOTHER SYSTEM WITH THE SAME A BUT DIFFERENT
       RIGHT-HAND SIDE,  WE WILL USE THE EXISTING L AND U FACTORS IN
       LUSTRUCT OBTAINED FROM A PREVIOUS FATORIZATION.
       ------------------------------------------------------------*/
    options.Fact = FACTORED; /* Indicate the factored form of A is supplied. */
    PStatInit(&stat); /* Initialize the statistics variables. */

    pdgssvx(&options, &A, &ScalePermstruct, b1, ldb, nrhs, &grid,
	    &LUstruct, &SOLVEstruct, berr, &stat, &info);

    /* Check the accuracy of the solution. */
    if ( !iam ) printf("\tSolve the system with a different B:\n");
    pdinf_norm_error(iam, ((NRformat_loc *)A.Store)->m_loc,
		     nrhs, b1, ldb, xtrue, ldx, &grid);

    PStatPrint(&options, &stat, &grid);        /* Print the statistics. */


    /* ------------------------------------------------------------
       DEALLOCATE STORAGE.
       ------------------------------------------------------------*/
    PStatFree(&stat);
    Destroy_CompRowLoc_Matrix_dist(&A);
    ScalePermstructFree(&ScalePermstruct);   
    Destroy_LU(n, &grid, &LUstruct);
    LUstructFree(&LUstruct);
    if ( options.SolveInitialized ) {
        dSolveFinalize(&options, &SOLVEstruct);
    }
    SUPERLU_FREE(b);
    SUPERLU_FREE(b1);
    SUPERLU_FREE(xtrue);
    SUPERLU_FREE(berr);

    /* ------------------------------------------------------------
       RELEASE THE SUPERLU PROCESS GRID.
       ------------------------------------------------------------*/
out:
    superlu_gridexit(&grid);

    /* ------------------------------------------------------------
       TERMINATES THE MPI EXECUTION ENVIRONMENT.
       ------------------------------------------------------------*/
    MPI_Finalize();

#if ( DEBUGlevel>=1 )
    CHECK_MALLOC(iam, "Exit main()");
#endif

}