Hi Kenneth, === Here is my MPICH info=== HYDRA build details: Version: 3.1 Release Date: Thu Feb 20 11:41:13 CST 2014 CC: gcc CXX: g++ F77: gfortran F90: gfortran Configure options: '--disable-option-checking' '--prefix=/icd/placement/zyan/tools/mpitch-install' '-enable-fast' '--cache-file=/dev/null' '--srcdir=/icd/placement/zyan/tools/DOWNLOAD/mpich-3.1/src/pm/hydra' 'CC=gcc' 'CFLAGS= -DNDEBUG -DNVALGRIND -O2' 'LDFLAGS= ' 'LIBS=-lrt -lpthread ' 'CPPFLAGS= -I/icd/placement/zyan/tools/build/mpich-3.1/src/mpl/include -I/icd/placement/zyan/tools/DOWNLOAD/mpich-3.1/src/mpl/include -I/icd/placement/zyan/tools/DOWNLOAD/mpich-3.1/src/openpa/src -I/icd/placement/zyan/tools/build/mpich-3.1/src/openpa/src -I/icd/placement/zyan/tools/build/mpich-3.1/src/mpi/romio/include' Process Manager: pmi Launchers available: ssh rsh fork slurm ll lsf sge manual persist Topology libraries available: hwloc Resource management kernels available: user slurm ll lsf sge pbs cobalt Checkpointing libraries available: Demux engines available: poll select === Here is partial sample of my code=== int world_size, universe_size, *universe_sizep, flag, rank; MPI_Comm everyone; /* intercommunicator */ char worker_program[100]; char hostname[1024]; gethostname(hostname, 1024); std::cout << "Hi, I'm the master. host: " << hostname << " pid: " << getpid() << std::endl; MPI_Init(&argc, &argv); MPI_Comm_size(MPI_COMM_WORLD, &world_size); MPI_Comm_rank(MPI_COMM_WORLD, &rank); std::cout << "Hi, I'm the master again. host: " << hostname << " rank: " << rank << ". pid: " << getpid() << " world_size: " << world_size << std::endl; if (world_size != 1) std::cout << "Top heavy with management" << std::endl; MPI_Comm_get_attr(MPI_COMM_WORLD, MPI_UNIVERSE_SIZE, &universe_sizep, &flag); ........ === Here is the error message I got without using mpiexec=== Hi, I'm the master. host: place37 pid: 31698 Hi, I'm the master again. host: place37 rank: 0. pid: 31698 world_size: 1 [mpiexec@place37] match_arg (/icd/placement/zyan/tools/DOWNLOAD/mpich-3.1/src/pm/hydra/utils/args/args.c:159): unrecognized argument pmi_args [mpiexec@place37] HYDU_parse_array (/icd/placement/zyan/tools/DOWNLOAD/mpich-3.1/src/pm/hydra/utils/args/args.c:174): argument matching returned error [mpiexec@place37] parse_args (/icd/placement/zyan/tools/DOWNLOAD/mpich-3.1/src/pm/hydra/ui/mpich/utils.c:1596): error parsing input array [mpiexec@place37] HYD_uii_mpx_get_parameters (/icd/placement/zyan/tools/DOWNLOAD/mpich-3.1/src/pm/hydra/ui/mpich/utils.c:1648): unable to parse user arguments [mpiexec@place37] main (/icd/placement/zyan/tools/DOWNLOAD/mpich-3.1/src/pm/hydra/ui/mpich/mpiexec.c:153): error parsing parameters Looks like the error happens in the code line of calling MPI_Comm_get_attr(). Thanks, Jackey -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Kenneth Raffenetti Sent: Thursday, April 10, 2014 11:08 AM To: [email protected] Subject: Re: [mpich-discuss] Run MPICH without mpiexec MPICH supports these dynamic process features. Can you tell us more information about your version of MPICH and provide a small example code that can reproduce the error you are getting? On 04/10/2014 01:00 PM, Jackey Yan wrote:

Hi everyone,

In MPICH, do I have to use mpiexec in the command line, in order to launch a MPI run?

I know that in MPI-2 standard, it supports the “dynamic process” feature, i.e., dynamically generate/spawn processes from existing singleton process.

So it is not required to use mpiexec/mpirun in the command line, in order to launch a singleton MPI.

But, I tried to run without mpiexec in MPICH, but it error out when parsing the arguments in Hydra…

Thanks,

Jackey

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