I tried something crazy -- I ran matlab from mpirun:
mpirun -np 1 matlab -nodesktop
Now my mex_client can connect to my MPI server
without crashing. Wow! :)
This isn't the way I wanted to run matlab; it should not be!
Indeed, other weird thing happened when I ran matlab from mpirun.
But why did mpirun help in this case? What is the right way
to start an MPI singleton from matlab via mex?
-------------------- mex_client.c --------------------
MPI_Init( NULL, NULL );
strcpy(port_name, "n0:i11:323" );
MPI_Comm_size(MPI_COMM_WORLD, &size);
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
/*
//status = MPI_Lookup_name("MPI_SERVER1", MPI_INFO_NULL, port_name);
//if (status != MPI_SUCCESS) {
//printf("****** MPI Server not up yet. \n");
//}
*/
MPI_Comm_connect( port_name, MPI_INFO_NULL, 0, MPI_COMM_SELF,
&server );
------------------- View3d_server.c -------------------------
MPI_Init(&argc, &argv);
MPI_Comm_size(MPI_COMM_WORLD, &num_proc);
MPI_Comm_rank(MPI_COMM_WORLD, &my_rank);
MPI_Open_port(MPI_INFO_NULL, sport_name);
while (1) {
MPI_Comm_accept(sport_name, MPI_INFO_NULL, 0, MPI_COMM_SELF,
&comm_client );
... ... ...
}
Lei_at_ICS wrote:
>Hi,
>
>I have an MPI server which opens a port, prints out the port name,
>and waits for connection. My client, in C, will use the printed
>port name as its argument to connect to the server and send
>a message to the server. The reason I do not use published
>names is that my call to MPI_Lookup_name() would crash
>(see my earlier emails; that's a different problem).
>
>Now my above server and client work fine until I made
>the client a MEX function called from Matlab. Now
>the sever will crash with the following error:
>losangeles[48]% mpirun -np 1 View3d_server
>MPI_SERVER available at n0:i11:323
>**** before MPI_Comm_accept ...
>MPI_Comm_accept: mismatched run-time flags: Bad address (rank 0,
>MPI_COMM_WORLD)
>Rank (0, MPI_COMM_WORLD): Call stack within LAM:
>Rank (0, MPI_COMM_WORLD): - MPI_Comm_accept()
>Rank (0, MPI_COMM_WORLD): - main()
>-----------------------------------------------------------------------------
>One of the processes started by mpirun has exited with a nonzero exit
>
>And the MEX client will crash with the following error:
> >> mex_client()
>*** port_name: n0:i11:323
>Rank (0, MPI_COMM_WORLD): Call stack within LAM:
>Rank (0, MPI_COMM_WORLD): - MPI_Comm_connect()
>Rank (0, MPI_COMM_WORLD): - main()
>MPI_Comm_connect: unclassified: Too many open files (rank 0, MPI_COMM_WORLD)
>
>My client (C or MEX) is very simple and it does not open any files.
>My LAM (7.1.1) was built with the options:
>
>--without-threads --with-memory-manager=none
>
>Any suggestions on how to solve this problem? Has anybody
>actually done this before?
>
>Thanks a lot for your help!
>
>-Lei
>
>
>
>
>_______________________________________________
>This list is archived at http://www.lam-mpi.org/MailArchives/lam/
>
>
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