Initializes the solver.
Include Files
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.
Description
The dss_create routine initializes the solver. After the call to dss_create, all subsequent invocations of the Intel MKL DSS routines must use the value of the handle returned by dss_create.
Warning
Do not write the value of handle directly.
The default value of the parameter opt is
MKL_DSS_MSG_LVL_WARNING + MKL_DSS_TERM_LVL_ERROR.
By default, the DSS routines use double precision for solving systems of linear equations. The precision used by the DSS routines can be set to single mode by adding the following value to the opt parameter:
MKL_DSS_SINGLE_PRECISION.
As for PARDISO, input data and internal arrays are required to have single precision.
By default, the DSS routines use Fortran style indexing for input arrays of integer types (the first value is referenced as array element 1). The indexing can be set to C style (the first value is referenced as array element 0) by adding the following value to the opt parameter:
MKL_DSS_ZERO_BASED_INDEXING.
This parameter can also control number of refinement steps used on the solution stage by specifying the two following values:
MKL_DSS_REFINEMENT_OFF - maximum number of refinement steps is set to zero; MKL_DSS_REFINEMENT_ON (default value) - maximum number of refinement steps is set to 2.
By default, DSS uses in-core computations. To launch the out-of-core version of DSS (OOC DSS) you can add to this parameter one of two possible values: MKL_DSS_OOC_STRONG and MKL_DSS_OOC_VARIABLE.
MKL_DSS_OOC_STRONG - OOC DSS is used.
MKL_DSS_OOC_VARIABLE - if the memory needed for the matrix factors is less than the value of the environment variable MKL_PARDISO_OOC_MAX_CORE_SIZE, then the OOC DSS uses the in-core kernels of PARDISO, otherwise it uses the OOC computations.
The variable MKL_PARDISO_OOC_MAX_CORE_SIZE defines the maximum size of RAM allowed for storing work arrays associated with the matrix factors. It is ignored if MKL_DSS_OOC_STRONG is set. The default value of MKL_PARDISO_OOC_MAX_CORE_SIZE is 2000 MB. This value and default path and file name for storing temporary data can be changed using the configuration file pardiso_ooc.cfg or command line (See more details in the PARDISO Parameters description above).
Warning
Do not change the OOC DSS settings after they are specified in the routine dss_create.
Input Parameters
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 is MKL_DSS_MSG_LVL_WARNING + MKL_DSS_TERM_LVL_ERROR. |