Re: [Boost-users] [MPI, serialization] Segmentation fault in heterogeneous cluster

Subject: Re: [Boost-users] [MPI, serialization] Segmentation fault in heterogeneous cluster
From: Matthias Troyer (troyer_at_[hidden])
Date: 2010-09-23 15:41:05

Hi
On 3 Sep 2010, at 18:36, Francesco Biscani wrote:

> Hi Matthias,
> 
> probably I'm doing something really stupid, but it seems the problem
> is somehow related to shared_ptr. This code reproduces the "MPI
> message truncated error":
> 
> #include <boost/mpi/environment.hpp>
> #include <boost/mpi/communicator.hpp>
> #include <boost/serialization/assume_abstract.hpp>
> #include <boost/serialization/export.hpp>
> #include <boost/serialization/base_object.hpp>
> #include <boost/serialization/shared_ptr.hpp>
> #include <boost/serialization/tracking.hpp>
> #include <boost/serialization/vector.hpp>
> #include <boost/shared_ptr.hpp>
> #include <vector>
> 
> struct base
> {
> 	virtual void do_something() const = 0;
> 	template <class Archive>
> 	void serialize(Archive &ar, const unsigned int)
> 	{
> 		ar & values;
> 	}
> 	std::vector<double> values;
> 	virtual ~base() {}
> };
> 
> BOOST_SERIALIZATION_ASSUME_ABSTRACT(base);
> 
> struct derived: public base
> {
> 	void do_something() const {};
> 	template <class Archive>
> 	void serialize(Archive &ar, const unsigned int)
> 	{
> 		ar & boost::serialization::base_object<base>(*this);
> 	}
> };
> 
> BOOST_CLASS_EXPORT(derived);
> 
> struct container
> {
> 	template <class Archive>
> 	void serialize(Archive &ar, const unsigned int)
> 	{
> 		ar & ptr;
> 	}
> 	boost::shared_ptr<base> ptr;
> };
> 
> 
> int main()
> {
> 	boost::mpi::environment env;
> 	boost::mpi::communicator world;
> 	if (world.rank() == 0) {
> 		boost::shared_ptr<container> c(new container());
> 		world.send(1,0,c);
> 		world.recv(1,0,c);
> 	} else {
> 		boost::shared_ptr<container> c(new container());
> 		world.recv(0,0,c);
> 		world.send(0,0,c);
> 	}
> 	return 0;
> }
> 
> The error happens when rank 1 is receiving the object:
> 
> terminate called after throwing an instance of
> 'boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::mpi::exception>
>> '
>  what():  MPI_Unpack: MPI_ERR_TRUNCATE: message truncated

Hi Francesco,

The support for shared_ptr was incomplete. Can you try this example with the current SVN trunk?

Matthias