mirror of
https://github.com/triqs/dft_tools
synced 2024-11-01 19:53:45 +01:00
40 lines
1.0 KiB
ReStructuredText
40 lines
1.0 KiB
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, e.g. :
|
||
|
|
|
||
|
|
.. compileblock::
|
||
|
|
|
||
|
|
#include <triqs/arrays.hpp>
|
||
|
|
#include <boost/mpi.hpp>
|
||
|
|
using triqs::arrays::array;using triqs::clef::placeholder;
|
||
|
|
|
||
|
|
int main() {
|
||
|
|
boost::mpi::environment env;//argc, argv);
|
||
|
|
boost::mpi::communicator world;
|
||
|
|
|
||
|
|
array<long,2> A (2,2), B(2,2),C(2,2);
|
||
|
|
placeholder<0> i_; placeholder<1> j_;
|
||
|
|
A(i_,j_) << (1+world.rank())*(10*i_+ j_);
|
||
|
|
|
||
|
|
if (world.rank() ==0) std::cout<<" A = "<<A<<std::endl;
|
||
|
|
|
||
|
|
boost::mpi::reduce (world, A,C, std::plus<array<long,2> >(),0);
|
||
|
|
|
||
|
|
int s= world.size();
|
||
|
|
if (world.rank() ==0) std::cout<<" C = "<<C<< " should be "<< array<long,2>( (s*(s+1)/2) * A) <<std::endl;
|
||
|
|
}
|
||
|
|
|
||
|
|
|