|
Packit Service |
c5cf8c |
|
|
Packit Service |
c5cf8c |
<HTML>
|
|
Packit Service |
c5cf8c |
<HEAD>
|
|
Packit Service |
c5cf8c |
<META NAME="GENERATOR" CONTENT="DOCTEXT">
|
|
Packit Service |
c5cf8c |
<TITLE>MPI_Ialltoallv</TITLE>
|
|
Packit Service |
c5cf8c |
</HEAD>
|
|
Packit Service |
c5cf8c |
<BODY BGCOLOR="FFFFFF">
|
|
Packit Service |
c5cf8c |
MPI_Ialltoallv
|
|
Packit Service |
c5cf8c |
Sends data from all to all processes in a nonblocking way; each process may send a different amount of data and provide displacements for the input and output data.
|
|
Packit Service |
c5cf8c |
Synopsis
|
|
Packit Service |
c5cf8c |
|
|
Packit Service |
c5cf8c |
int MPI_Ialltoallv(const void *sendbuf, const int sendcounts[], const int sdispls[],
|
|
Packit Service |
c5cf8c |
MPI_Datatype sendtype, void *recvbuf, const int recvcounts[],
|
|
Packit Service |
c5cf8c |
const int rdispls[], MPI_Datatype recvtype, MPI_Comm comm, MPI_Request * request)
|
|
Packit Service |
c5cf8c |
|
|
Packit Service |
c5cf8c |
Input Parameters
|
|
Packit Service |
c5cf8c |
|
|
Packit Service |
c5cf8c |
sendbuf starting address of the send buffer (choice)
|
|
Packit Service |
c5cf8c |
|
|
Packit Service |
c5cf8c |
sendcounts non-negative integer array (of length group size) specifying the number of elements to send to each processor
|
|
Packit Service |
c5cf8c |
|
|
Packit Service |
c5cf8c |
sdispls integer array (of length group size). Entry j specifies the displacement relative to sendbuf from which to take the outgoing data destined for process j
|
|
Packit Service |
c5cf8c |
|
|
Packit Service |
c5cf8c |
sendtype data type of send buffer elements (handle)
|
|
Packit Service |
c5cf8c |
|
|
Packit Service |
c5cf8c |
recvcounts non-negative integer array (of length group size) specifying the number of elements that can be received from each processor
|
|
Packit Service |
c5cf8c |
|
|
Packit Service |
c5cf8c |
rdispls integer array (of length group size). Entry i specifies the displacement relative to recvbuf at which to place the incoming data from process i
|
|
Packit Service |
c5cf8c |
|
|
Packit Service |
c5cf8c |
recvtype data type of receive buffer elements (handle)
|
|
Packit Service |
c5cf8c |
|
|
Packit Service |
c5cf8c |
comm communicator (handle)
|
|
Packit Service |
c5cf8c |
|
|
Packit Service |
c5cf8c |
|
|
Packit Service |
c5cf8c |
Output Parameters
|
|
Packit Service |
c5cf8c |
|
|
Packit Service |
c5cf8c |
recvbuf starting address of the receive buffer (choice)
|
|
Packit Service |
c5cf8c |
|
|
Packit Service |
c5cf8c |
request communication request (handle)
|
|
Packit Service |
c5cf8c |
|
|
Packit Service |
c5cf8c |
|
|
Packit Service |
c5cf8c |
Thread and Interrupt Safety
|
|
Packit Service |
c5cf8c |
|
|
Packit Service |
c5cf8c |
This routine is thread-safe. This means that this routine may be
|
|
Packit Service |
c5cf8c |
safely used by multiple threads without the need for any user-provided
|
|
Packit Service |
c5cf8c |
thread locks. However, the routine is not interrupt safe. Typically,
|
|
Packit Service |
c5cf8c |
this is due to the use of memory allocation routines such as <tt>malloc
|
|
Packit Service |
c5cf8c |
</tt>or other non-MPICH runtime routines that are themselves not interrupt-safe.
|
|
Packit Service |
c5cf8c |
|
|
Packit Service |
c5cf8c |
Notes for Fortran
|
|
Packit Service |
c5cf8c |
All MPI routines in Fortran (except for <tt>MPI_WTIME</tt> and <tt>MPI_WTICK</tt>) have
|
|
Packit Service |
c5cf8c |
an additional argument <tt>ierr</tt> at the end of the argument list. <tt>ierr
|
|
Packit Service |
c5cf8c |
</tt>is an integer and has the same meaning as the return value of the routine
|
|
Packit Service |
c5cf8c |
in C. In Fortran, MPI routines are subroutines, and are invoked with the
|
|
Packit Service |
c5cf8c |
<tt>call</tt> statement.
|
|
Packit Service |
c5cf8c |
|
|
Packit Service |
c5cf8c |
All MPI objects (e.g., <tt>MPI_Datatype</tt>, <tt>MPI_Comm</tt>) are of type <tt>INTEGER
|
|
Packit Service |
c5cf8c |
</tt>in Fortran.
|
|
Packit Service |
c5cf8c |
|
|
Packit Service |
c5cf8c |
Errors
|
|
Packit Service |
c5cf8c |
|
|
Packit Service |
c5cf8c |
All MPI routines (except <tt>MPI_Wtime</tt> and <tt>MPI_Wtick</tt>) return an error value;
|
|
Packit Service |
c5cf8c |
C routines as the value of the function and Fortran routines in the last
|
|
Packit Service |
c5cf8c |
argument. Before the value is returned, the current MPI error handler is
|
|
Packit Service |
c5cf8c |
called. By default, this error handler aborts the MPI job. The error handler
|
|
Packit Service |
c5cf8c |
may be changed with <tt>MPI_Comm_set_errhandler</tt> (for communicators),
|
|
Packit Service |
c5cf8c |
<tt>MPI_File_set_errhandler</tt> (for files), and <tt>MPI_Win_set_errhandler</tt> (for
|
|
Packit Service |
c5cf8c |
RMA windows). The MPI-1 routine <tt>MPI_Errhandler_set</tt> may be used but
|
|
Packit Service |
c5cf8c |
its use is deprecated. The predefined error handler
|
|
Packit Service |
c5cf8c |
<tt>MPI_ERRORS_RETURN</tt> may be used to cause error values to be returned.
|
|
Packit Service |
c5cf8c |
Note that MPI does not guarentee that an MPI program can continue past
|
|
Packit Service |
c5cf8c |
an error; however, MPI implementations will attempt to continue whenever
|
|
Packit Service |
c5cf8c |
possible.
|
|
Packit Service |
c5cf8c |
|
|
Packit Service |
c5cf8c |
</BODY></HTML>
|