As a follow-up, I tried this with Open MPI 1.10.4 and this worked as
expected (the port formatting looks really different):
$ mpirun -np 1 ./server
Port name is 1286733824.0;tcp://10.102.16.135:43074
+1286733825.0;tcp://10.102.16.135::300
Accepted!
$ mpirun -np 1 ./client "1286733824.0;tcp://10.102.16.135:43074
+1286733825.0;tcp://10.102.16.135::300"
Trying with '1286733824.0;tcp://10.102.16.135:43074
+1286733825.0;tcp://10.102.16.135::300'
Connected!
I've found some other posts of users asking about similar things regarding
the 2.x release - is this a bug?
On Sun, Mar 12, 2017 at 9:38 PM, Adam Sylvester <op8...@gmail.com> wrote:
> I'm using Open MPI 2.0.2 on RHEL 7. I'm trying to use MPI_Open_port() /
> MPI_Comm_accept() / MPI_Conn_connect(). My use case is that I'll have two
> processes running on two machines that don't initially know about each
> other (i.e. I can't do the typical mpirun with a list of IPs); eventually I
> think I may need to use ompi-server to accomplish what I want but for now
> I'm trying to test this out running two processes on the same machine with
> some toy programs.
>
> server.cpp creates the port, prints it, and waits for a client to accept
> using it:
>
> #include <mpi.h>
> #include <iostream>
>
> int main(int argc, char** argv)
> {
> MPI_Init(NULL, NULL);
>
> char myport[MPI_MAX_PORT_NAME];
> MPI_Comm intercomm;
>
> MPI_Open_port(MPI_INFO_NULL, myport);
> std::cout << "Port name is " << myport << std::endl;
>
> MPI_Comm_accept(myport, MPI_INFO_NULL, 0, MPI_COMM_SELF, &intercomm);
>
> std::cout << "Accepted!" << std::endl;
>
> MPI_Finalize();
> return 0;
> }
>
> client.cpp takes in this port on the command line and tries to connect to
> it:
>
> #include <mpi.h>
> #include <iostream>
>
> int main(int argc, char** argv)
> {
> MPI_Init(NULL, NULL);
>
> MPI_Comm intercomm;
>
> const std::string name(argv[1]);
> std::cout << "Trying with '" << name << "'" << std::endl;
> MPI_Comm_connect(name.c_str(), MPI_INFO_NULL, 0, MPI_COMM_SELF,
> &intercomm);
>
> std::cout << "Connected!" << std::endl;
>
> MPI_Finalize();
> return 0;
> }
>
> I run the server first:
> $ mpirun ./server
> Port name is 2720137217.0:595361386
>
> Then a second later I run the client:
> $ mpirun ./client 2720137217.0:595361386
> Trying with '2720137217.0:595361386'
>
> Both programs hang for awhile and then eventually time out. I have a
> feeling I'm misunderstanding something and doing something dumb but from
> all the examples I've seen online it seems like this should work.
>
> Thanks for the help.
> -Adam
>
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