python - mpi4py Communication error with rank 4 -


i have built 4 pi3 cluster using tutorial found here.

the tests available worked fine , nodes functioning described end.

i began following tutorial here.

the python code i'm using is:

from mpi4py import mpi  comm = mpi.comm_world size=comm.get_size() rank-comm.get_rank()  if rank == 0:     data = [(x+1) ** x x in range (size)]    print 'scattering data',data else:    data = none  data = comm.scatter(data,root=0) print 'rank',rank,'has data: ', data

my machinefile looks this:

node1:4 node2:4 node3:4 node4:4

if execute file command:

mpiexec -f machinefile -n 4 python scatter.py

i output:

pi@node1:~/cloud $ mpiexec -f machinefile -n 4 python scatter1.py scattering data [1, 2, 9, 64] rank 0 has data:  1 rank 1 has data:  2 rank 2 has data:  9 rank 3 has data:  64

but if try higher rank 4 falls over:

pi@node1:~/cloud $ mpiexec -f machinefile -n 5 python scatter1.py scattering data [1, 2, 9, 64, 625] rankrank 2 has data:  9 rank 3 has data:  64 1 has data: traceback (most recent call last):   file "scatter1.py", line 12, in <module>  2     data = comm.scatter(data,root=0)   file "mpi/comm.pyx", line 1286, in mpi4py.mpi.comm.scatter (src/mpi4py.mpi.c:109079)   file "mpi/msgpickle.pxi", line 713, in mpi4py.mpi.pympi_scatter (src/mpi4py.mpi.c:48214) mpi4py.mpi.exception: unknown error class, error stack: pmpi_scatterv(386).........: mpi_scatterv(sbuf=0x76a32694, scnts=0x1659de0, displs=0x1656750, mpi_byte, rbuf=0x76a354f4, rcount=5, mpi_byte, root=0, mpi_comm_world) failed mpir_scatterv_impl(184)....:  mpir_scatterv(108).........:  mpic_isend(649)............:  mpidi_eagercontigisend(573): failure occurred while attempting send eager message mpidi_ch3_isendv(34).......: communication error rank 4  ^c[mpiexec@node1] sending ctrl-c processes requested [mpiexec@node1] press ctrl-c again force abort [mpiexec@node1] hydu_sock_write (/home/pi/mpich2/mpich-3.2/src/pm/hydra/utils/sock/sock.c:286): write error (bad file descriptor) [mpiexec@node1] hyd_pmcd_pmiserv_send_signal (/home/pi/mpich2/mpich-3.2/src/pm/hydra/pm/pmiserv/pmiserv_cb.c:169): unable write data proxy [mpiexec@node1] ui_cmd_cb (/home/pi/mpich2/mpich-3.2/src/pm/hydra/pm/pmiserv/pmiserv_pmci.c:79): unable send signal downstream [mpiexec@node1] hydt_dmxu_poll_wait_for_event (/home/pi/mpich2/mpich-3.2/src/pm/hydra/tools/demux/demux_poll.c:76): callback returned error status [mpiexec@node1] hyd_pmci_wait_for_completion (/home/pi/mpich2/mpich-3.2/src/pm/hydra/pm/pmiserv/pmiserv_pmci.c:198): error waiting event [mpiexec@node1] main (/home/pi/mpich2/mpich-3.2/src/pm/hydra/ui/mpich/mpiexec.c:344): process manager error waiting completion

can help?


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