Hi, consider a setup of one MPI sender process unicasting J messages to each of N MPI receiver processes, i.e., the total number of transmissions is J*N. Each transmission is a block of a matrix, which has been split both horizontally and vertically. Each block has been stored as an element of a 2D list, i.e. a list of J lists, each of which has N elements. I won't go into the details of the Python code (please see attached) but I am pasting the problematic part here:
On the sender's level: *reqA = [None] * J * N* *for i in range(J):* * for j in range(N):* * reqA[i*N+j] = comm.Isend([np.ascontiguousarray(Ahv[i][j//k][j%k]), MPI.INT <http://MPI.INT>], dest=j+1, tag=15)* *MPI.Request.Waitall(reqA)* On the receiver's level: *A = []* *rA = [None] * J* *for i in range(J):* * A.append(np.empty_like(np.matrix([[0]*(n//k) for j in range(m//q)])))* * rA[i] = comm.Irecv(A[i], source=0, tag=15)* *MPI.Request.Waitall(rA)* *#test* *for i in range(J):* * print "For job %d, worker %d received splits of A, b" % (i, comm.Get_rank()-1)* * print(A[i])* There are some other transmissions/requests in between which can be found in the attached file. I do not think they interfere with those, though. When I print all of the received blocks, they look like some memory trash and none of them is the same as the blocks that were sent. I am using Python 2.7.14 and Open MPI 2.1.2 (I have also attached the output of ompi_info). Thanks, Kostas Konstantinidis
Package: Open MPI kostas@kostas-VirtualBox Distribution
Open MPI: 2.1.2
Open MPI repo revision: v2.1.1-188-g6157ed8
Open MPI release date: Sep 20, 2017
Open RTE: 2.1.2
Open RTE repo revision: v2.1.1-188-g6157ed8
Open RTE release date: Sep 20, 2017
OPAL: 2.1.2
OPAL repo revision: v2.1.1-188-g6157ed8
OPAL release date: Sep 20, 2017
MPI API: 3.1.0
Ident string: 2.1.2
Prefix: /usr/local
Configured architecture: x86_64-unknown-linux-gnu
Configure host: kostas-VirtualBox
Configured by: kostas
Configured on: Sun May 6 22:54:43 CDT 2018
Configure host: kostas-VirtualBox
Built by: root
Built on: Sun May 6 23:03:58 CDT 2018
Built host: kostas-VirtualBox
C bindings: yes
C++ bindings: yes
Fort mpif.h: yes (all)
Fort use mpi: yes (full: ignore TKR)
Fort use mpi size: deprecated-ompi-info-value
Fort use mpi_f08: yes
Fort mpi_f08 compliance: The mpi_f08 module is available, but due to
limitations in the gfortran compiler, does not
support the following: array subsections, direct
passthru (where possible) to underlying Open MPI's
C functionality
Fort mpi_f08 subarrays: no
Java bindings: no
Wrapper compiler rpath: runpath
C compiler: gcc
C compiler absolute: /usr/bin/gcc
C compiler family name: GNU
C compiler version: 5.4.0
C++ compiler: g++
C++ compiler absolute: /usr/bin/g++
Fort compiler: gfortran
Fort compiler abs: /usr/bin/gfortran
Fort ignore TKR: yes (!GCC$ ATTRIBUTES NO_ARG_CHECK ::)
Fort 08 assumed shape: yes
Fort optional args: yes
Fort INTERFACE: yes
Fort ISO_FORTRAN_ENV: yes
Fort STORAGE_SIZE: yes
Fort BIND(C) (all): yes
Fort ISO_C_BINDING: yes
Fort SUBROUTINE BIND(C): yes
Fort TYPE,BIND(C): yes
Fort T,BIND(C,name="a"): yes
Fort PRIVATE: yes
Fort PROTECTED: yes
Fort ABSTRACT: yes
Fort ASYNCHRONOUS: yes
Fort PROCEDURE: yes
Fort USE...ONLY: yes
Fort C_FUNLOC: yes
Fort f08 using wrappers: yes
Fort MPI_SIZEOF: yes
C profiling: yes
C++ profiling: yes
Fort mpif.h profiling: yes
Fort use mpi profiling: yes
Fort use mpi_f08 prof: yes
C++ exceptions: no
Thread support: posix (MPI_THREAD_MULTIPLE: no, OPAL support: yes,
OMPI progress: no, ORTE progress: yes, Event lib:
yes)
Sparse Groups: no
Internal debug support: yes
MPI interface warnings: yes
MPI parameter check: runtime
Memory profiling support: no
Memory debugging support: no
dl support: yes
Heterogeneous support: no
mpirun default --prefix: no
MPI I/O support: yes
MPI_WTIME support: native
Symbol vis. support: yes
Host topology support: yes
MPI extensions: affinity, cuda
MPI_MAX_PROCESSOR_NAME: 256
MPI_MAX_ERROR_STRING: 256
MPI_MAX_OBJECT_NAME: 64
MPI_MAX_INFO_KEY: 36
MPI_MAX_INFO_VAL: 256
MPI_MAX_PORT_NAME: 1024
MPI_MAX_DATAREP_STRING: 128
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uncoded.py
Description: Binary data
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