(sidenote: please check the date on your mail client -- your mail
apparently came on May 26, 9999, and our web mail archive software
therefore refused to archive it)
I don't see anything wrong with what you're doing. However, it's only
a portion of your code, so here's a few suggestions:
1. Check to see that vector::resize() isn't lazy and isn't delaying the
allocation of memory until you actually use an STL accessor to get at
the data.
2. Check that you're resetting "position" to 0 before unpacking.
3. Check to ensure that you don't have any other memory errors, and
this is just a side effect of the real problem. You might want to use
a memory-checking debugger such as valgrind.
Sorry I can't give anything more definite. :-\
On Feb 7, 2106, at 1:28 AM, Dim Coumou wrote:
> Hello,
> I have a question about sending-receiving stl::vector's. I can send a
> single
> vector using syntax:
> MPI::COMM_WORLD.Send(&vec[0],vec_size,MPI::INT,proc,tag);
> and corresponding receive:
> MPI::COMM_WORLD.Recv(&vec[0],vec_size,MPI::INT,proc,tag,status);
> However if I want to send a bunch of vectors using MPI::Pack I get into
> problems. Packing and sending stl::vector's is still possible. It is
> also
> possible to unpack such a message into an normal C-array.
> Unfortunately, if
> I directly unpack into a stl::vector I do not retrieve the right
> elements.
> Below the syntax I use for the case of packing-and-sending one
> vector.Most
> probably I do something really stupid, but I don't see what's going
> wrong
> here. Any suggestions? Many thanks in advance.
> MPI::COMM_WORLD.Send(&bufsize,1, MPI::INT, dest, 0);
> MPI::INT.Pack(&vec_size,1,buffer,bufsize,position,MPI::COMM_WORLD);
> MPI::INT.Pack(&vec[0],vec_size,buffer,bufsize,position,MPI::
> COMM_WORLD);
> MPI::COMM_WORLD.Send(buffer,position, MPI::PACKED, dest, 1);
> and corresponding receive:
> MPI::COMM_WORLD.Recv(&bufsize,1,MPI::INT, 0, 0, status);
> MPI::COMM_WORLD.Recv(buffer, bufsize, MPI::PACKED, 0, 1, status);
> MPI::INT.Unpack(buffer, bufsize, &vec_size, 1, position,
> MPI::COMM_WORLD);
> vec2.resize(vec_size);
> MPI::INT.Unpack(buffer, bufsize, &vec2[0], vec_size, position,
> MPI::COMM_WORLD);
>
> <winmail.dat>_______________________________________________
> This list is archived at http://www.lam-mpi.org/MailArchives/lam/
--
{+} Jeff Squyres
{+} jsquyres_at_[hidden]
{+} http://www.lam-mpi.org/
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