Re: [Boost-users] boost MPI issue on windows

1 Nov 2010

      With that in place in Release mode, t

1st  (in scatter.hpp) ar.size(): 48
2nd (before line 31 in point_to_point.cpp) ar.size(): 2292879725

In Debug mode, both are 48.

thanks,

Nick
On Nov 1, 2010, at 6:46 AM, Matthias Troyer wrote:
...
Great, so far all is correct. Could you now please add a similar print statement before lie 31 of libs/mpi/src/point_to_point.cpp ?
Matthias
On 27 Oct 2010, at 15:41, Nick Collier wrote:
...
ar.size(), as added below, returns 48 in both debug and release modes.
thanks,
Nick
On Oct 26, 2010, at 4:33 PM, Matthias Troyer wrote:
...
On 26 Oct 2010, at 15:52, Nick Collier wrote:
...
I winnowed my own code down to a simple scatter call. I get the error under release mode but not under debug. Here's the code:
namespace mpi  = boost::mpi;
int main(int argc, char **argv) {
  mpi::environment env(argc, argv);
  mpi::communicator world;
vector<int> out;
  vector in;
  if (world.rank() == 0) {
      for (int i = 0; i < world.size(); ++i) {
      	vector<int> vec(10, 12);
      	in.push_back(vec);
      }
  }
try {
      mpi::scatter(world, in, out, 0);
  } catch (std::exception& ex) {
      std::cerr << ex.what() << std::endl;
      throw ex;
  }
cout << world.rank() << " : " << out.size() << endl;
}
And the error is:
ar size: 4293462132
MPI_Send: Invalid count, error stack:
MPI_Send(176): MPI_Send(buf=0x0016F78C, count=-1505164, MPI_PACKED, dest=1, tag=
2147483647, MPI_COMM_WORLD) failed
MPI_Send(101): Negative count, value is -1505164
This seems to happen in line 73 of boost/mpi/collectives/scatter.hpp . To see where exactly this optimization issue arises, could you please add a print statement
std::cerr << oa.size() << std::endl;
before line 73 to print the size of the archive there.
Matthias
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