On 06/24/2022 01:38 PM, Jeff Squyres (jsquyres) via users wrote: > Guillaume -- > > There is an MPI Standard document that you can obtain from mpi-forum.org. > Open MPI v4.x adheres to MPI version 3.1 (the latest version of the MPI > standard is v4.0, but that is unrelated to Open MPI's version number). >
I already downloaded it. But I did not find rules on the value of a communicator (I admit I did not read all the 1200 pages carefully...). - The communicator has to be an integer and that's all? Can it be positive or negative? - It is initialized to MPI_COMM_NULL, which is invalid. Then, after connect/accept it got a value and become valid. > Frankly, Open MPI's support of the dynamic API functionality > (connect/accept/etc.) has always been a bit shaky; they have been tested to > work in very, very specific conditions, and not made super robust to work in > many different / generalized cases. Is there a chance you can orient your > app to not use the MPI dynamic APIs? > ok. Thx for your reply. Regards Guillaume > -- > Jeff Squyres > jsquy...@cisco.com > > ________________________________________ > From: users <users-boun...@lists.open-mpi.org> on behalf of Gilles > Gouaillardet via users <users@lists.open-mpi.org> > Sent: Friday, June 24, 2022 5:56 AM > To: Open MPI Users > Cc: Gilles Gouaillardet > Subject: Re: [OMPI users] Intercommunicator issue (any standard about > communicator?) > > 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 > >
