Thanks for the reply Julio. I thought that the purpose of using the skeleton/content approach was precisely to deal with situations such as this. The object (a map in this case) I am trying to send is fully populated when the skeleton is sent and thus it's "shape" does not change and the buffer should be of the appropriate size. If this is not the case then how does one go about sending a std::map at all? Also, I'm failing to see how this situation differs from sending a std::vector, which works fine.<br>
<br>Thanks again,<br>Tim<br><br><div class="gmail_quote">2011/9/30 J�lio Hoffimann <span dir="ltr"><<a href="mailto:julio.hoffimann@gmail.com">julio.hoffimann@gmail.com</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
Hi Tim,<div><br></div><div>This is not a bug, the MPI_ERR_TRUNCATE is related to the underlying MPI implementation and occurs when the receive buffer is lesser than the message size. For to use the Boost.MPI skeleton and content approach you must guarantee a fixed "shape" object.�So, for example, you should not use this approach with boost::optional<> unless you know it's state beforehand because it's "shape" depends on it. (as a discriminated union, it could be seen as a one element or a empty container)</div>
<div><br></div><div>In other words, Boost.MPI can deal with all Boost.Serialization types, but not all of them are adequate to do "skeleton and content" in common tasks.</div><div><br></div><div>Regards,</div><div>
J�lio.</div><div><br><div class="gmail_quote">2011/9/30 Tim Jacobs <span dir="ltr"><<a href="mailto:tjacobs2@email.unc.edu" target="_blank">tjacobs2@email.unc.edu</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div><div></div><div class="h5">
I'm not sure why the following test-class produces this error: "MPI_Recv: MPI_ERR_TRUNCATE: message truncated"<br><br>If the std::map has only a single element (ie I remove one of the test[].push_back() lines) the error does not occur. Can someone verify that this is indeed a bug and not just novice misuse of the library?<br>
<br>Thanks,<br>Tim<br><br>#include <boost/mpi.hpp><br>#include <boost/serialization/string.hpp><br>#include <boost/serialization/vector.hpp><br>#include <boost/serialization/map.hpp><br><br>int<br>
main( int argc, char * argv [] )<br>{<br>� boost::mpi::environment env(argc, argv);<br>� boost::mpi::communicator world;<br><br>� if(world.rank()==0){<br>����� std::map<int, std::vector<std::string> > test;<br>
����� test[1].push_back("FOO");<br>����� test[50].push_back("BAR");<br>����� world.send(1, 1, boost::mpi::skeleton(test));<br>����� world.send(1, 1, boost::mpi::get_content(test));<br>����� std::cout << "sent" << std::endl;<br>
� }<br>� else{<br>����� std::map<int, std::vector<std::string> > test;<br>����� world.recv(0,1,boost::mpi::skeleton(test));<br>����� world.recv(0,1,boost::mpi::get_content(test));<br>� }<br>}<br><br>
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