bionic (1) likwid-mpirun.1.gz

NAME

       likwid-mpirun - A tool to start and monitor MPI applications with LIKWID

SYNOPSIS

       likwid-memsweeper     [-hvdOm]     [-n    number_of_processes]    [-hostfile    filename]    [-nperdomain
       number_of_processes_in_domain] [-pin expression] [-omp omptype] [-mpi mpitype] [-g eventset] [--]

DESCRIPTION

       likwid-mpirun is a command line application that wraps the vendor-specific mpirun tool and adds calls  to
       likwid-perfctr(1)  to  the  execution string. The user-given application is ran, measured and the results
       returned to the staring node.

OPTIONS

       -h,--help
              prints a help message to standard output, then exits

       -v,--version
              prints version information to standard output, then exits

       -d,--debug
              prints debug messages to standard output

       -n,-np,--n,--np <number_of_processes>
              specifies how many MPI processes should be started

       -hostfile <filename>
              specifies the nodes to schedule the MPI processes on. If  not  given,  the  environment  variables
              PBS_NODEFILE, LOADL_HOSTFILE and SLURM_HOSTFILE are checked.

       -nperdomain <number_of_processes_in_domain>
              specifies the processes per affinity domain (see likwid-pin for info about affinity domains)

       -pin <expression>
              specifies the pinning for hybrid execution (see likwid-pin for info about affinity domains)

       -s, --skip <mask>
              Specify skip mask as HEX number. For each set bit the corresponding thread is skipped.

       -omp <omptype>
              enables hybrid setup. Likwid tries to determine OpenMP type automatically. The only possible value
              are intel and gnu

       -mpi <mpitype>
              specifies the MPI implementation that should be used by the wrapper. Possible values are intelmpi,
              openmpi and mvapich2

       -m,--marker
              activates the Marker API for the executed MPI processes

       -O     prints output in CSV not ASCII tables

       --     stops   parsing  arguments  for  likwid-mpirun,  in  order  to  set  options  for  underlying  MPI
              implementation after --.

EXAMPLE

       1.  For standard application:

       likwid-mpirun -np 32 ./myApp

       Will run 32 MPI processes, each host is filled with as much processes as written in ppn

       2.  With pinning:

       likwid-mpirun -np 32 -nperdomain S:2 ./myApp

       Will start 32 MPI processes with 2 processes per socket.

       3.  For hybrid runs:

       likwid-mpirun -np 32 -pin M0:0-3_M1:0-3 ./myApp

       Will start 32 MPI processes with 2 processes per node. Threads of the first process  are  pinned  to  the
       cores  0-3  in  NUMA domain 0 (M0). The OpenMP threads of the second process are pinned to the first four
       cores in NUMA domain 1 (M1)

BUGS

       When measuring Uncore events it is not possible to select a  cpu  pin  expression  that  covers  multiple
       sockets,  e.g.  S0:0-1_S0:2@S1:2.  This runs two processes, each running on two CPUs. But since the first
       CPU of the second expression is on socket 0, which is already handled by S0:0-1, the second  MPI  process
       gets  a event set that does not contain Uncore counters although the second part of the second expression
       would measure the Uncore counters on socket 1.

AUTHOR

       Written by Thomas Roehl <thomas.roehl@googlemail.com>.

BUGS

       Report Bugs on <https://github.com/RRZE-HPC/likwid/issues>.

SEE ALSO

       likwid-pin(1), likwid-perfctr(1), likwid-powermeter(1)