Hi Gilles, MPI_COMM_WORLD is positive (44000000).
In a short code I wrote I have something like that: MPI_Comm_dup(MPI_COMM_WORLD, &world); cout << "intra-communicator: " << "world" << "---" << hex << world << endl; It returns "84000006" (in hex). later I have: MPI_Comm_accept(port_name, MPI_INFO_NULL, 0, world, &interClient); cout << "intercommunicator interClient=" << interClient << endl; After connection from a third party client it returns "c4000003" (in hex). Both 84000006 and c4000003 are negative integer in dec. I don't know if it is "normal". Therefore I'm looking about rules on the communicators, intercommunicators. Regards, Guillaume On 06/24/2022 11:56 AM, Gilles Gouaillardet via users wrote: > Guillaume, > > what do you mean by (the intercommunicators are all negative"? > > > Cheers, > > Gilles > > On Fri, Jun 24, 2022 at 4:23 PM Guillaume De Nayer via users > <users@lists.open-mpi.org <mailto:users@lists.open-mpi.org>> wrote: > > Hi, > > I am new on this list. Let me introduce myself shortly: I am a > researcher in fluid mechanics. In this context I am using softwares > related on MPI. > > I am facing a problem: > - 3 programs forms a computational framework. Soft1 is a coupling > program, i.e., it opens an MPI port at the beginning. Soft2 and Soft3 > are clients, which connect to the coupling program using > MPI_Comm_connect. > - After the start and the connections of Soft2 and Soft3 with Soft1, it > hangs. > > I started to debug this issue and as usual I found another issue (or > perhaps it is not an issue): > - The intercommunicators I get between Soft1-Soft2 and Soft1-Soft3 are > all negative (running on CentOS 7 with infiniband Mellanox OFED driver). > - Is there some standard about communicator? I don't find anything > about > this topic. > - What is a valid communicator, intercommunicator? > > thx a lot > Regards > Guillaume >
