mirror of
https://github.com/triqs/dft_tools
synced 2024-12-27 06:43:40 +01:00
45 lines
1013 B
ReStructuredText
45 lines
1013 B
ReStructuredText
.. highlight:: c
|
|
|
|
MPI and serialization
|
|
##########################################
|
|
|
|
Serialization
|
|
============================
|
|
|
|
The `value classes` and the views are compatible with Boost Serialization library.
|
|
|
|
MPI
|
|
============================
|
|
|
|
The `value classes` (array, matrix, vector) can be bcasted, reduced,
|
|
with the boost.mpi library.
|
|
|
|
Example::
|
|
|
|
#include <<array.hpp>
|
|
#include <boost/mpi.hpp>
|
|
#include <iostream>
|
|
using namespace triqs::arrays;
|
|
namespace mpi=boost::mpi;
|
|
|
|
int main() {
|
|
mpi::environment env(argc, argv);
|
|
mpi::communicator world;
|
|
|
|
array<long,2> A (2,2), B(2,2),C(2,2);
|
|
for (int i =0; i<2; ++i)
|
|
for (int j=0; j<2; ++j)
|
|
{ A(i,j) = (1+world.rank())*(10*i+ j);}
|
|
|
|
if (world.rank() ==0) cout<<" A = "<<A<<endl;
|
|
|
|
boost::mpi::reduce (world, A,C, std::plus<array<long,2> >(),0);
|
|
|
|
int s= world.size();
|
|
if (world.rank() ==0) cout<<" C = "<<C<< " should be "<< array<long,2>( (s*(s+1)/2) * A) <<endl;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|