Reopening this thread. In searching another problem I ran across this one in a different context. Turns out there really is a bug here that needs to be addressed.
I'll try to tackle it this weekend - will update you when done. On Jun 25, 2010, at 7:23 AM, Philippe wrote: > Hi, > > I'm trying to run a test program which consists of a server creating a > port using MPI_Open_port and N clients using MPI_Comm_connect to > connect to the server. > > I'm able to do so with 1 server and 2 clients, but with 1 server + 3 > clients, I get the following error message: > > [node003:32274] [[37084,0],0]:route_callback tried routing message > from [[37084,1],0] to [[40912,1],0]:102, can't find route > > This is only happening with the openib BTL. With tcp BTL it works > perfectly fine (ofud also works as a matter of fact...). This has been > tested on two completely different clusters, with identical results. > In either cases, the IB frabic works normally. > > Any help would be greatly appreciated! Several people in my team > looked at the problem. Google and the mailing list archive did not > provide any clue. I believe that from an MPI standpoint, my test > program is valid (and it works with TCP, which make me feel better > about the sequence of MPI calls) > > Regards, > Philippe. > > > > Background: > > I intend to use openMPI to transport data inside a much larger > application. Because of that, I cannot used mpiexec. Each process is > started by our own "job management" and use a name server to find > about each others. Once all the clients are connected, I would like > the server to do MPI_Recv to get the data from all the client. I dont > care about the order or which client are sending data, as long as I > can receive it with on call. Do do that, the clients and the server > are going through a series of Comm_accept/Conn_connect/Intercomm_merge > so that at the end, all the clients and the server are inside the same > intracomm. > > Steps: > > I have a sample program that show the issue. I tried to make it as > short as possible. It needs to be executed on a shared file system > like NFS because the server write the port info to a file that the > client will read. To reproduce the issue, the following steps should > be performed: > > 0. compile the test with "mpicc -o ben12 ben12.c" > 1. ssh to the machine that will be the server > 2. run ./ben12 3 1 > 3. ssh to the machine that will be the client #1 > 4. run ./ben12 3 0 > 5. repeat step 3-4 for client #2 and #3 > > the server accept the connection from client #1 and merge it in a new > intracomm. It then accept connection from client #2 and merge it. when > the client #3 arrives, the server accept the connection, but that > cause client #1 and #2 to die with the error above (see the complete > trace in the tarball). > > The exact steps are: > > - server open port > - server does accept > - client #1 does connect > - server and client #1 do merge > - server does accept > - client #2 does connect > - server, client #1 and client #2 do merge > - server does accept > - client #3 does connect > - server, client #1, client #2 and client #3 do merge > > > My infiniband network works normally with other test programs or > applications (MPI or others like Verbs). > > Info about my setup: > > openMPI version = 1.4.1 (I also tried 1.4.2, nightly snapshot of > 1.4.3, nightly snapshot of 1.5 --- all show the same error) > config.log in the tarball > "ompi_info --all" in the tarball > OFED version = 1.3 installed from RHEL 5.3 > Distro = RedHat Entreprise Linux 5.3 > Kernel = 2.6.18-128.4.1.el5 x86_64 > subnet manager = built-in SM from the cisco/topspin switch > output of ibv_devinfo included in the tarball (there are no "bad" nodes) > "ulimit -l" says "unlimited" > > The tarball contains: > > - ben12.c: my test program showing the behavior > - config.log / config.out / make.out / make-install.out / > ifconfig.txt / ibv-devinfo.txt / ompi_info.txt > - trace-tcp.txt: output of the server and each client when it works > with TCP (I added "btl = tcp,self" in ~/.openmpi/mca-params.conf) > - trace-ib.txt: output of the server and each client when it fails > with IB (I added "btl = openib,self" in ~/.openmpi/mca-params.conf) > > I hope I provided enough info for somebody to reproduce the problem... > <ompi-output.tar.bz2>_______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users
