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
#include
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
#include
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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