Re: [Boost-users] mpi all reduce with std::vector and back_inserter

Subject: Re: [Boost-users] mpi all reduce with std::vector and back_inserter
From: Kraus Philipp (philipp.kraus_at_[hidden])
Date: 2011-05-05 18:42:21

Am 06.05.2011 um 00:24 schrieb Júlio Hoffimann:

> Hi Kraus,
>
> If i understood well, it's not the case for `all_reduce`, you need  
> `all_gather` instead:
>
> http://www.boost.org/doc/libs/1_46_1/doc/html/boost/mpi/ 
> all_gather.html
>
> The vectors has the same size?

No, they have different sizes. I use all_gather, but I must iterate  
over each element in the result vector and put the elements into a new  
vector. I do this at the time:

std::vector< std::vector<std::string> > result;
mpi::all_gather( mpi object, vec, result);

std::vector<std::string> myvec;
foreach( result as res )
      myvec.push_back( foreach in res );

I need the loop after all_gather and my question is: Can I do the loop  
call into the mpi command, so that I don't have a loop after the gather?

Thx

Phil