Re: [Boost-users] [mpi] irecv / send problem

Subject: Re: [Boost-users] [mpi] irecv / send problem
From: Matthias Troyer (troyer_at_[hidden])
Date: 2009-08-06 16:54:50

Hi Nick,

can you please file a ticket with your example code so that we do not  
forget about this? I understand the issue but the fix will not be easy.

Matthias

On 12 Jun 2009, at 13:16, Nick Collier wrote:

> I running into an issue where an irecv followed by a send results in  
> deadlock. A simple test case,
>
> class Item {
> private:
>
> 	friend class boost::serialization::access;
>
> 	template<class Archive>
> 	void serialize(Archive& ar, const unsigned int version) {
> 		ar & val;
> 	}
>
> public:
> 	int val;
> 	Item() : val(1) {
> 	}
>
> };
>
> struct Receipt {
>
> 	boost::mpi::request request;
> 	std::vector<Item> items;
> };
>
> int main(int argc, char **argv) {
>
> 	mpi::environment env(argc, argv);
> 	mpi::communicator world;
> 	Receipt receipt;
>
> 	vector<Item> msg(100000);
>
> 	int other = world.rank() == 0 ? 1 : 0;
> 	cout << world.rank() << " irecv from " << other << endl;
> 	receipt.request = world.irecv(other, 0, receipt.items);
> 	cout << world.rank() << " sending to " << other << endl;
> 	world.send(other, 0, msg);
>
> 	receipt.request.wait();
>
> 	cout << "Done" << endl;
> }
>
> Run with mpirun -np 2, this never completes. It does complete with  
> vector<Item> msg(10) however.
>
> Nick
>
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