Computes or sets a permutation vector that minimizes the fill-in during the factorization phase.
The FORTRAN 77 interface is specified in the mkl_dss.f77 include file, the Fortran 90 interface is specified in the mkl_dss.f90 include file, and the C interface is specified in the mkl_dss.h include file.
If opt contains the option MKL_DSS_AUTO_ORDER, then the routine dss_reorder computes a permutation vector that minimizes the fill-in during the factorization phase. For this option, the routine ignores the contents of the perm array.
If opt contains the option MKL_DSS_METIS_OPENMP_ORDER, then the routine dss_reorder computes permutation vector using the parallel (OpenMP) nested dissections algorithm to minimize the fill-in during the factorization phase. This option can be used to decrease the time of dss_reorder call on multi-core computers. For this option, the routine ignores the contents of the perm array.
If opt contains the option MKL_DSS_MY_ORDER, then you must supply a permutation vector in the array perm. In this case, the array perm is of length nRows, where nRows is the number of rows in the matrix as defined by the previous call to dss_define_structure.
If opt contains the option MKL_DSS_GET_ORDER, then the permutation vector computed during the dss_reorder call is copied to the array perm. In this case you must allocate the array perm beforehand. The permutation vector is computed in the same way as if the option MKL_DSS_AUTO_ORDER is set.
Name |
Type |
Description |
|---|---|---|
opt |
FORTRAN 77: INTEGER Fortran 90: INTEGER, INTENT(IN) C: _INTEGER_t const* |
Parameter to pass the DSS options. The default value for the permutation type is MKL_DSS_AUTO_ORDER. |
perm |
FORTRAN 77: INTEGER Fortran 90: INTEGER, INTENT(IN) C: _INTEGER_t const* |
Array of length nRows. Contains a user-defined permutation vector (accessed only if opt contains MKL_DSS_MY_ORDER or MKL_DSS_GET_ORDER). |
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