Hi Jeff, Thanks. I moved over to MPICH.
Best, Doug. > On Nov 14, 2019, at 8:58 AM, Jeff Squyres (jsquyres) <jsquy...@cisco.com> > wrote: > > Are you asking a question about MPICH? If so, I think you should probably > ask on their mailing lists -- they're an entirely different project from Open > MPI. > > Also, I think you mean "processes", not "threads". > >> On Nov 11, 2019, at 5:01 PM, sdcycling via users <users@lists.open-mpi.org >> <mailto:users@lists.open-mpi.org>> wrote: >> >> mpirun -n 4 myprog is only giving me 1 thread when I would like 4. How do I >> specify 4 threads? mpiexec.hydra -n 4 correctly gives me 4 threads. I have >> tried to configure a hostfile with no luck. I am running Ubuntu 18.04. >> Here is a listing of hello.f90: >> >> use mpi >> implicit none >> integer, parameter :: i4= selected_real_kind(4) >> integer (i4) :: mype >> integer (i4) :: nprocs >> integer (i4) :: ierr >> call mpi_init(ierr) >> call mpi_comm_size(mpi_comm_world,nprocs,ierr) >> call mpi_comm_rank(mpi_comm_world,mype,ierr) >> write(6,*) 'Hello World',mype >> call mpi_finalize(ierr) >> stop >> end >> >> Here is a mpirun example: >> >> mpirun -n 4 a.out >> Hello World 0 >> Hello World 0 >> Hello World 0 >> Hello World 0 >> >> Here is a mpiexec.hydra example: >> >> mpiexec.hydra -n 4 a.out >> Hello World 3 >> Hello World 1 >> Hello World 2 >> Hello World 0 >> >> Here is the output of lscpu: >> >> Architecture: x86_64 >> CPU op-mode(s): 32-bit, 64-bit >> Byte Order: Little Endian >> CPU(s): 256 >> On-line CPU(s) list: 0-255 >> Thread(s) per core: 2 >> Core(s) per socket: 64 >> Socket(s): 2 >> NUMA node(s): 2 >> Vendor ID: AuthenticAMD >> CPU family: 23 >> Model: 49 >> Model name: AMD EPYC 7742 64-Core Processor >> Stepping: 0 >> CPU MHz: 1499.900 >> CPU max MHz: 2250.0000 >> CPU min MHz: 1500.0000 >> BogoMIPS: 4499.95 >> Virtualization: AMD-V >> L1d cache: 32K >> L1i cache: 32K >> L2 cache: 512K >> L3 cache: 16384K >> NUMA node0 CPU(s): 0-63,128-191 >> NUMA node1 CPU(s): 64-127,192-255 >> >> >> >> > > > -- > Jeff Squyres > jsquy...@cisco.com <mailto:jsquy...@cisco.com>
