Hi Huiwei, 1> Did you start your nameserver ? 2> Did the server program crash? I see the same hang (incomplete MPI_Finalize in client). Here is my command line: Ø hydra_namserver & Ø mpiexec -n 1 -nameserver <hostname> ./server Ø mpiexec -n 1 -nameserver <hostname> ./client MPICH Version: 3.2a2 MPICH Release date: Sun Nov 16 11:09:31 CST 2014 MPICH Device: ch3:sock MPICH configure: --prefix /home/hroy/local//mpich-3.2a2/linux_x86_64 --disable-f77 --disable-fc --disable-f90modules --disable-cxx --enable-fast=nochkmsg --enable-fast=notiming --enable-fast=ndebug --enable-fast=O3 --with-device=ch3:sock --enable-g=dbg --disable-fortran --without-valgrind CFLAGS=-O3 -fPIC CXXFLAGS=-O3 -fPIC MPICH CC: /u/prod/gnu/gcc/20121129/gcc-4.5.0-linux_x86_64/bin/gcc -O3 -fPIC -g -O3 MPICH CXX: no -O3 -fPIC -g MPICH F77: no -g MPICH FC: no -g Thanks, Hirak ________________________________ Could you try with the latest mpich-3.2a2? The client exit successfully on my Macbook with sock channel. - Huiwei

On Nov 16, 2014, at 10:44 PM, Hirak Roy <hirak_roy at mentor.com<https://lists.mpich.org/mailman/listinfo/discuss>> wrote:

Hi All,

Here is my sample program. I am using channel sock of mpich-3.0.4.

I am running it as

...

mpiexec -n 1 ./server.out

...

mpiexec -n 1 ./client.out

Here my client program (client.c) hangs in MPI_Finalize.

There is an assert in the server.c where server exits.

There is no way to detect that in client.

Even if we detect that using some timeout strategy, the client hangs in the finalize step.

Could you please suggest what is going wrong here or is this a bug in sock channel?

Thanks,

Hirak

<client.c><server.c>_______________________________________________

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