| MPI_IALLTOALL(sendbuf, sendcount, sendtype, recvbuf, recvcount, recvtype, comm, request) | |
| IN sendbuf | starting address of send buffer (choice) |
| IN sendcount | number of elements sent to each MPI process (non-negative integer) |
| IN sendtype | datatype of send buffer elements (handle) |
| OUT recvbuf | address of receive buffer (choice) |
| IN recvcount | number of elements received from any MPI process (non-negative integer) |
| IN recvtype | datatype of receive buffer elements (handle) |
| IN comm | communicator (handle) |
| OUT request | communication request (handle) |
This call starts a nonblocking variant of MPI_ALLTOALL (see Section All-to-All Scatter/Gather).
| MPI_IALLTOALLV(sendbuf, sendcounts, sdispls, sendtype, recvbuf, recvcounts, rdispls, recvtype, comm, request) | |
| IN sendbuf | starting address of send buffer (choice) |
| IN sendcounts | nonnegative integer array (of length group size) specifying the number of elements to send to each MPI process |
| IN sdispls | integer array (of length group size). Entry j specifies the displacement (relative to sendbuf) from which to take the outgoing data destined for MPI process j |
| IN sendtype | datatype of send buffer elements (handle) |
| OUT recvbuf | address of receive buffer (choice) |
| IN recvcounts | nonnegative integer array (of length group size) specifying the number of elements that can be received from each MPI process |
| IN rdispls | integer array (of length group size). Entry i specifies the displacement (relative to recvbuf) at which to place the incoming data from MPI process i |
| IN recvtype | datatype of receive buffer elements (handle) |
| IN comm | communicator (handle) |
| OUT request | communication request (handle) |
This call starts a nonblocking variant of MPI_ALLTOALLV (see Section All-to-All Scatter/Gather).
| MPI_IALLTOALLW(sendbuf, sendcounts, sdispls, sendtypes, recvbuf, recvcounts, rdispls, recvtypes, comm, request) | |
| IN sendbuf | starting address of send buffer (choice) |
| IN sendcounts | integer array (of length group size) specifying the number of elements to send to each MPI process (array of non-negative integers) |
| IN sdispls | integer array (of length group size). Entry j specifies the displacement in bytes (relative to sendbuf) from which to take the outgoing data destined for MPI process j (array of integers) |
| IN sendtypes | array of datatypes (of length group size). Entry j specifies the type of data to send to MPI process j (array of handles) |
| OUT recvbuf | address of receive buffer (choice) |
| IN recvcounts | integer array (of length group size) specifying the number of elements that can be received from each MPI process (array of non-negative integers) |
| IN rdispls | integer array (of length group size). Entry i specifies the displacement in bytes (relative to recvbuf) at which to place the incoming data from MPI process i (array of integers) |
| IN recvtypes | array of datatypes (of length group size). Entry i specifies the type of data received from MPI process i (array of handles) |
| IN comm | communicator (handle) |
| OUT request | communication request (handle) |
This call starts a nonblocking variant of MPI_ALLTOALLW (see Section All-to-All Scatter/Gather).