HI Ricardo, Thanks for responding. I'm beginning to suspect this is because of some library mismatch, since the C version works correctly for me. Where does the build pick up the location of the MPI library? I just want to make sure it's finding the same version I'm linking to. cheers, /Patrik On Fri, Nov 18, 2011 at 8:59 AM, Riccardo Murri wrote:

Hi Patrik,

On Thu, Nov 17, 2011 at 00:09, Patrik Jonsson wrote:

...

I'm having some problem with nonblocking p2p communications. This is with boost 1.47 and openmpi-1.5.3 compiled with icpc 12.0.3.

I tried to run your example on my Ubuntu 11.04 box (GCC 4.5.2, OpenMPI 1.4.3, both coming from the main Ubuntu packages) and get no error:

   $ mpirun -np 3 --gmca btl tcp,self ./a.out    Task 2 posting recv from 0    Task 2 sending to 0    Task 0 posting recv from 1    Task 1 posting recv from 0    Task 0 sending to 1    Task 1 sending to 0    Task 2 posting recv from 1    Task 2 sending to 1    Task 0 posting recv from 2    Task 0 sending to 2    Task 1 posting recv from 2    Task 1 sending to 2    Task 1 received message tag 13 from task 0    Task 2 received message tag 13 from task 1    Task 1 received message tag 13 from task 2

I have tried up to "-np 8" without any problem.

Note that the final loop does not receive all pending messages, but that's because the final "for" loop only does one pass over "handshake_reqs_".  If I substitute it with the following, all messages are received correctly:

   // receive all messages in final loop    while (not handshake_reqs_.empty()) {      int i = 0;      while(i

   # sample output    $ mpirun -np 3 --gmca btl tcp,self ./a.out    Task 0 posting recv from 1    Task 0 sending to 1    Task 1 posting recv from 0    Task 2 posting recv from 0    Task 2 sending to 0    Task 0 posting recv from 2    Task 0 sending to 2    Task 1 sending to 0    Task 2 posting recv from 1    Task 2 sending to 1    Task 1 posting recv from 2    Task 1 sending to 2    Task 2 received message tag 13 from task 0    Task 2 received message tag 13 from task 1    Task 0 received message tag 13 from task 1    Task 0 received message tag 13 from task 2    Task 1 received message tag 13 from task 0    Task 1 received message tag 13 from task 2

Best regards, Riccardo _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

Ok, figured it out. As I suspected, there was a mismatch, not with libraries but with the headers. Boost built correctly, but when I compiled my program it found headers from a different OpenMPI build and used those. Thanks for your assistance and sorry for the noise. Regards, /Patrik On Fri, Nov 18, 2011 at 11:26 AM, Riccardo Murri wrote:

Hi Patrik,

On Fri, Nov 18, 2011 at 16:30, Patrik Jonsson wrote:

...

Thanks for responding. I'm beginning to suspect this is because of some library mismatch, since the C version works correctly for me. Where does the build pick up the location of the MPI library?

The build process uses the mpic++/mpicxx/mpiCC compiler wrapper, which then inserts the correct "-I"/"-L" switches for the real C++ compiler.

The build process searches for "mpic++", "mpiCC" and "mpicxx" in this order; look into `tools/build/v2/tools/mpi.jam` for details.

If you want to force the use of a specific `mpic++`, you can append this line to the `user-config.jam` file:

   using mpi : /path/to/preferred/mpicxx ;

Best regards, Riccardo _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users