Visible to Intel only — GUID: GUID-9ABFE950-322A-425C-8C11-75EE310AAA68
Visible to Intel only — GUID: GUID-9ABFE950-322A-425C-8C11-75EE310AAA68
cluster_sparse_solver_get_csr_size
Computes the (local) number of rows and (local) number of nonzero entries for (distributed) CSR data corresponding to the provided name.
Syntax
call cluster_sparse_solver_get_csr_size (pt, name, local_nrows, local_nnz, comm, error)
Include Files
- mkl_cluster_sparse_solver.f90
Description
This routine uses the internal data created during the factorization phase of cluster_sparse_solver for matrix A. The routine then:
Computes the local number of rows and the local number of nonzeros for CSR data that correspond to the provided name
Returns the computed values in local_nrows and local_nnz
It is assumed that the CSR data defined by the name will be distributed in the same way as the matrix A (as defined by iparm(40)) used in cluster_sparse_solver.
The returned values can be used for allocating CSR arrays for factors L and U, and also for allocating arrays for permutations P and Q, or scaling matrix D which can then be used with cluster_sparse_solver_set_csr_ptrs or cluster_sparse_solver_set_ptr for exporting corresponding data via cluster_sparse_solver_export.
Only call this routine after the factorization phase (phase=22) of the cluster_sparse_solver has been called. Neither pt, nor iparm should be changed after the preceding call to cluster_sparse_solver.
Input Parameters
- pt
-
INTEGER*8 for 64-bit architectures
Array with size of 64.
Handle to internal data structure used in the prior calls to cluster_sparse_solver.
CAUTION:Do not modify pt after the calls to cluster_sparse_solver.
- name
-
INTEGER
Specifies CSR data for which the output values are computed.
- SPARSE_PTLUQT_L
-
Factor L from P*A*Q=L*U.
- SPARSE_PTLUQT_U
-
Factor U from P*A*Q=L*U.
- SPARSE_DPTLUQT_L
-
Factor L from P* (D-1A)*Q=L*U.
- SPARSE_DPTLUQT_U
-
Factor U from P* (D-1A)*Q=L*U.
- comm
-
INTEGER*4
MPI communicator. The solver uses the Fortran MPI communicator internally.
Output Parameters
- local_nrows
-
INTEGER
The local number of rows for the CSR data which correspond to the name.
- local_nnz
-
INTEGER
The local number of nonzero entries for the CSR data which correspond to the name.
- error
-
INTEGER
The error indicator:
- error
- Information
- 0
-
no error
- -1
-
pt is a null pointer
- -2
-
invalid pt
- -3
-
invalid name
- -4
-
unsupported name
- -9
-
unsupported internal code path, consider switching off non-default iparm parameters for cluster_sparse_solver
- -10
-
unsupported case when the matrix A is distributed among processes with overlap in the preceding calls to cluster_sparse_solver
- -12
-
internal memory error