MPI_Alltoallw_init(3) MPI MPI_Alltoallw_init(3)
NAME
MPI_Alltoallw_init - Create a persistent request for alltoallw.
SYNOPSIS
int MPI_Alltoallw_init(const void *sendbuf, const int sendcounts[],
const int sdispls[], const MPI_Datatype sendtypes[],
void *recvbuf, const int recvcounts[],
const int rdispls[], const MPI_Datatype recvtypes[],
MPI_Comm comm, MPI_Info info, MPI_Request *request)
int MPI_Alltoallw_init_c(const void *sendbuf, const MPI_Count sendcounts[],
const MPI_Aint sdispls[],
const MPI_Datatype sendtypes[], void *recvbuf,
const MPI_Count recvcounts[], const MPI_Aint rdispls[],
const MPI_Datatype recvtypes[], MPI_Comm comm,
MPI_Info info, MPI_Request *request)
INPUT PARAMETERS
sendbuf
- starting address of send buffer (choice)
sendcounts
- integer array (of length group size) specifying the number of
elements to send to each rank (non-negative integer)
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 process j (integer)
sendtypes
- Array of datatypes (of length group size). Entry j specifies the
type of data to send to process j (handle)
recvcounts
- integer array (of length group size) specifying the number of
elements that can be received from each rank (non-negative
integer)
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 process i (integer)
recvtypes
- array of datatypes (of length group size). Entry i specifies the
type of data received from process i (handle)
comm - communicator (handle)
info - info argument (handle)
OUTPUT PARAMETERS
recvbuf
- address of receive buffer (choice)
request
- communication request (handle)
THREAD AND INTERRUPT SAFETY
This routine is thread-safe. This means that this routine may be safely
used by multiple threads without the need for any user-provided thread
locks. However, the routine is not interrupt safe. Typically, this is
due to the use of memory allocation routines such as malloc or other non-
MPICH runtime routines that are themselves not interrupt-safe.
NOTES FOR FORTRAN
All MPI routines in Fortran (except for MPI_WTIME and MPI_WTICK ) have an
additional argument ierr at the end of the argument list. ierr is an
integer and has the same meaning as the return value of the routine in C.
In Fortran, MPI routines are subroutines, and are invoked with the call
statement.
All MPI objects (e.g., MPI_Datatype , MPI_Comm ) are of type INTEGER in
Fortran.
ERRORS
All MPI routines (except MPI_Wtime and MPI_Wtick ) return an error value;
C routines as the value of the function and Fortran routines in the last
argument. Before the value is returned, the current MPI error handler is
called. By default, this error handler aborts the MPI job. The error
handler may be changed with MPI_Comm_set_errhandler (for communicators),
MPI_File_set_errhandler (for files), and MPI_Win_set_errhandler (for RMA
windows). The MPI-1 routine MPI_Errhandler_set may be used but its use
is deprecated. The predefined error handler MPI_ERRORS_RETURN may be
used to cause error values to be returned. Note that MPI does not
guarantee that an MPI program can continue past an error; however, MPI
implementations will attempt to continue whenever possible.
MPI_SUCCESS
- No error; MPI routine completed successfully.
MPI_ERR_ARG
- Invalid argument. Some argument is invalid and is not
identified by a specific error class (e.g., MPI_ERR_RANK ).
MPI_ERR_BUFFER
- Invalid buffer pointer. Usually a null buffer where one is not
valid.
MPI_ERR_COMM
- Invalid communicator. A common error is to use a null
communicator in a call (not even allowed in MPI_Comm_rank ).
MPI_ERR_COUNT
- Invalid count argument. Count arguments must be non-negative; a
count of zero is often valid.
MPI_ERR_INFO
- Invalid Info
MPI_ERR_TYPE
- Invalid datatype argument. Additionally, this error can occur
if an uncommitted MPI_Datatype (see MPI_Type_commit ) is used in a
communication call.
MPI_ERR_OTHER
- Other error; use MPI_Error_string to get more information about
this error code.
1/27/2023 MPI_Alltoallw_init(3)
mpi 4.1 - Generated Sun Jan 29 12:56:31 CST 2023