But where would I put it? If I put it in the while(1), then
MPI_Comm_Accept cannot be called for the second time. If I put it
outside of the loop it will never be called.
On 09/16/2015 04:18 PM, Jalel Chergui wrote:
Can you check with an MPI_Finalize in the receiver ?
Jalel
Le 16/09/2015 16:06, marcin.krotkiewski a écrit :
I have run into a freeze / potential bug when using MPI_Comm_accept
in a simple client / server implementation. I have attached two
simplest programs I could produce:
1. mpi-receiver.c opens a port using MPI_Open_port, saves the port
name to a file
2. mpi-receiver enters infinite loop and waits for connections using
MPI_Comm_accept
3. mpi-sender.c connects to that port using MPI_Comm_connect, sends
one MPI_UNSIGNED_LONG, calls barrier and disconnects using
MPI_Comm_disconnect
4. mpi-receiver reads the MPI_UNSIGNED_LONG, prints it, calls
barrier and disconnects using MPI_Comm_disconnect and goes to point 2
- infinite loop
All works fine, but only exactly 5 times. After that the receiver
hangs in MPI_Recv, after exit from MPI_Comm_accept. That is 100%
repeatable. I have tried with Intel MPI - no such problem.
I execute the programs using OpenMPI 1.10 as follows
mpirun -np 1 --mca mpi_leave_pinned 0 ./mpi-receiver
Do you have any clues what could be the reason? Am I doing sth wrong,
or is it some problem with internal state of OpenMPI?
Thanks a lot!
Marcin
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