Hi Gilles, I'm using both openmpi and intel mpi. I have with both problem with the communicators. Therefore, I tried to get some infos about them.
Thx a lot for your help. Have a nice day On 06/24/2022 02:14 PM, Gilles Gouaillardet via users wrote: > Guillaume, > > MPI_Comm is an opaque handler that should not be interpreted by an end user. > > Open MPI chose to implement is as an opaque pointer, and MPICH chose to > implement it as a 32 bits unsigned integer. > The 44000000 value strongly suggests you are using MPICH and you are > hence posting to the wrong mailing list > > > Cheers, > > Gilles > > On Fri, Jun 24, 2022 at 9:06 PM Guillaume De Nayer via users > <users@lists.open-mpi.org <mailto:users@lists.open-mpi.org>> wrote: > > 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> > <mailto: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 > > > >
