fml  0.1-0
Fused Matrix Library
lu.hh
1 // This file is part of fml which is released under the Boost Software
2 // License, Version 1.0. See accompanying file LICENSE or copy at
3 // https://www.boost.org/LICENSE_1_0.txt
4 
5 #ifndef FML_MPI_LINALG_LU_H
6 #define FML_MPI_LINALG_LU_H
7 #pragma once
8 
9 
10 #include "../../_internals/linalgutils.hh"
11 #include "../../cpu/cpuvec.hh"
12 
13 #include "../mpimat.hh"
14 
15 #include "internals/scalapack.hh"
16 
17 
18 namespace fml
19 {
20 namespace linalg
21 {
45  template <typename REAL>
46  void lu(mpimat<REAL> &x, cpuvec<int> &p, int &info)
47  {
48  info = 0;
49  const len_t m = x.nrows();
50  const len_t lipiv = std::min(m, x.ncols());
51 
52  p.resize(lipiv);
53 
54  fml::scalapack::getrf(m, x.ncols(), x.data_ptr(), x.desc_ptr(), p.data_ptr(), &info);
55  }
56 
58  template <typename REAL>
59  void lu(mpimat<REAL> &x)
60  {
61  cpuvec<int> p;
62  int info;
63 
64  lu(x, p, info);
65 
66  fml::linalgutils::check_info(info, "getrf");
67  }
68 }
69 }
70 
71 
72 #endif
fml::mpimat
Matrix class for data distributed over MPI in the 2-d block cyclic format.
Definition: mpimat.hh:40
fml::univec::data_ptr
T * data_ptr()
Pointer to the internal array.
Definition: univec.hh:28
fml::unimat::nrows
len_t nrows() const
Number of rows.
Definition: unimat.hh:36
fml::cpuvec::resize
void resize(len_t size)
Resize the internal object storage.
Definition: cpuvec.hh:210
fml::linalg::lu
void lu(cpumat< REAL > &x, cpuvec< int > &p, int &info)
Computes the PLU factorization with partial pivoting.
Definition: lu.hh:48
fml::cpuvec
Vector class for data held on a single CPU.
Definition: cpuvec.hh:31
fml::unimat::ncols
len_t ncols() const
Number of columns.
Definition: unimat.hh:38
fml::unimat::data_ptr
REAL * data_ptr()
Pointer to the internal array.
Definition: unimat.hh:40
fml
Core namespace.
Definition: dimops.hh:10