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] [--mpiopts opts]

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, slurm and mvapich2

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

       -O     prints output in CSV not ASCII tables

       --mpiopts <opts>
              adds options for the underlying MPI implementation. Please use proper quoting.

       --     stops parsing arguments for likwid-mpirun.

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 hardware threads 0-3 in NUMA domain 0 (M0). The OpenMP threads of the second
       process are pinned to the first four hardware threads 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 Gruber <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)