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

Subject: Re: [Boost-users] boost MPI issue on windows
From: Matthias Troyer (troyer_at_[hidden])
Date: 2010-11-01 06:46:38

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<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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