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

Subject: Re: [Boost-users] boost MPI issue on windows
From: Nick Collier (nick.collier_at_[hidden])
Date: 2010-10-27 09:41:50

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<vector<int> > 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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