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sparse_matrix_impl.hpp
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1 /*
2  Copyright (c) 2012 The Regents of the University of California,
3  through Lawrence Berkeley National Laboratory.
4 
5  Author: Mathias Jacquelin and Lin Lin
6 
7  This file is part of PEXSI. All rights reserved.
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42 */
46 #ifndef _PEXSI_SPARSE_MATRIX_IMPL_HPP_
47 #define _PEXSI_SPARSE_MATRIX_IMPL_HPP_
48 
49 #include <iostream>
50 #include "environment.hpp"
51 
52 using std::ifstream;
53 using std::ofstream;
54 
55 #include "utility.hpp"
56 
57 
58 namespace PEXSI{
59 
60 template <class F> inline LongInt DistSparseMatrix<F>::Nnz ( )
61 {
62 #ifndef _RELEASE_
63  PushCallStack("DistSparseMatrix<F>::Nnz");
64 #endif
65  LongInt nnzLocalLong = nnzLocal;
66  LongInt nnz;
67 
68  MPI_Allreduce( &nnzLocalLong, &nnz, 1, MPI_LONG_LONG, MPI_SUM,
69  comm );
70 
71 #ifndef _RELEASE_
72  PopCallStack();
73 #endif
74 
75  return nnz;
76 } // ----- end of method DistSparseMatrix<F>::Nnz -----
77 
78 
79 
80 
81 
82 } // namespace PEXSI
83 
84 #endif // _PEXSI_SPARSE_MATRIX_IMPL_HPP_
Environmental variables.
Various utility subroutines.
LongInt Nnz()
Compute the total number of nonzeros through MPI_Allreduce.
Definition: sparse_matrix_impl.hpp:60