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MPI Collective Communications
Collective communication must involve all processes in the scope of a communicator. All processes are by default, members in the communicator MPI_COMM_WORLD.
Some Frequently Used Collective Communication Routines
MPI_Barrier (comm)
MPI_Bcast (&buffer,count,datatype,root,comm)
MPI_Scatter (&sendbuf,sendcnt,sendtype,&recvbuf,recvcnt,recvtype,root,comm)
MPI_Gather (&sendbuf,sendcnt,sendtype,&recvbuf,recvcount,recvtype,root,comm)
MPI_Allgather (&sendbuf,sendcount,sendtype,&recvbuf,recvcount,recvtype,comm)
MPI_Reduce (&sendbuf,&recvbuf,count,datatype,op,root,comm)
| MPI Reduction Operation |
C Data Types |
Fortran Data Type |
MPI_MAX
| maximum
| integer, float
| integer, real, complex
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MPI_MIN
| minimum
| integer, float
| integer, real, complex
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MPI_SUM
| sum
| integer, float
| integer, real, complex
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MPI_PROD
| product
| integer, float
| integer, real, complex
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MPI_LAND
| logical AND
| integer
| logical
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MPI_BAND
| bit-wise AND
| integer, MPI_BYTE
| integer, MPI_BYTE
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MPI_LOR
| logical OR
| integer
| logical
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MPI_BOR
| bit-wise OR
| integer, MPI_BYTE
| integer, MPI_BYTE
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MPI_LXOR
| logical XOR
| integer
| logical
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MPI_BXOR
| bit-wise XOR
| integer, MPI_BYTE
| integer, MPI_BYTE
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MPI_MAXLOC
| max value and location
| float, double and long double
| real, complex,double precision
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MPI_MINLOC
| min value and location
| float, double and long double
| real, complex, double precision
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