202 lines
6.1 KiB
Groff
202 lines
6.1 KiB
Groff
.\" Man page generated from reStructuredText.
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.TH "MPI_IMPROBE" "3" "Feb 14, 2025" "" "Open MPI"
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.sp
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\fI\%MPI_Improbe\fP — Non\-blocking matched probe for a message.
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.SH SYNTAX
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.SS C Syntax
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.INDENT 0.0
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.INDENT 3.5
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.sp
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.nf
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.ft C
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#include <mpi.h>
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int MPI_Improbe(int source, int tag, MPI_Comm comm,
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int *flag, MPI_Message *message, MPI_Status *status)
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.ft P
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.fi
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.UNINDENT
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.UNINDENT
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.SS Fortran Syntax
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.INDENT 0.0
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.INDENT 3.5
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.sp
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.nf
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.ft C
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USE MPI
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! or the older form: INCLUDE \(aqmpif.h\(aq
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MPI_IMPROBE(SOURCE, TAG, COMM, FLAG, MESSAGE, STATUS, IERROR)
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LOGICAL FLAG
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INTEGER SOURCE, TAG, COMM, MESSAGE
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INTEGER STATUS(MPI_STATUS_SIZE), IERROR
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.ft P
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.fi
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.UNINDENT
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.UNINDENT
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.SS Fortran 2008 Syntax
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.INDENT 0.0
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.INDENT 3.5
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.sp
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.nf
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.ft C
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USE mpi_f08
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MPI_Improbe(source, tag, comm, flag, message, status, ierror)
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INTEGER, INTENT(IN) :: source, tag
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TYPE(MPI_Comm), INTENT(IN) :: comm
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INTEGER, INTENT(OUT) :: flag
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TYPE(MPI_Message), INTENT(OUT) :: message
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TYPE(MPI_Status) :: status
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INTEGER, OPTIONAL, INTENT(OUT) :: ierror
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.ft P
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.fi
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.UNINDENT
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.UNINDENT
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.SH INPUT PARAMETERS
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.INDENT 0.0
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.IP \(bu 2
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\fBsource\fP: Source rank or \fBMPI_ANY_SOURCE\fP (integer).
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.IP \(bu 2
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\fBtag\fP: Tag value or \fBMPI_ANY_TAG\fP (integer).
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.IP \(bu 2
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\fBcomm\fP: Communicator (handle).
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.UNINDENT
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.SH OUTPUT PARAMETERS
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.INDENT 0.0
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.IP \(bu 2
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\fBflag\fP: Flag (logical).
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.IP \(bu 2
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\fBmessage\fP: Message (handle).
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.IP \(bu 2
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\fBstatus\fP: Status object (status).
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.IP \(bu 2
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\fBierror\fP: Fortran only: Error status (integer).
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.UNINDENT
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.SH DESCRIPTION
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.sp
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Like \fI\%MPI_Probe\fP and \fI\%MPI_Iprobe\fP, the \fI\%MPI_Mprobe\fP and \fI\%MPI_Improbe\fP operations
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allow incoming messages to be queried without actually receiving them,
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except that \fI\%MPI_Mprobe\fP and \fI\%MPI_Improbe\fP provide a mechanism to receive
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the specific message that was matched regardless of other intervening
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probe or receive operations. This gives the application an opportunity
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to decide how to receive the message, based on the information returned
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by the probe. In particular, the application may allocate memory for the
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receive buffer according to the length of the probed message.
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.sp
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A matching probe with \fBMPI_PROC_NULL\fP as \fIsource\fP returns \fIflag\fP = true,
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.sp
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\fImessage\fP = \fBMPI_MESSAGE_NO_PROC\fP, and the \fIstatus\fP object returns source
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^ \fBMPI_PROC_NULL\fP, tag ^ \fBMPI_ANY_TAG\fP, and count ^ 0.
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.sp
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\fI\%MPI_Iprobe\fP returns a true value in \fIflag\fP if a message has been matched
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and can be received by passing the \fImessage\fP handle to the \fI\%MPI_Mrecv\fP or
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\fI\%MPI_Imrecv\fP functions, provided the \fIsource\fP was not \fBMPI_PROC_NULL\fP\&.
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.SH ERRORS
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.sp
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Almost all MPI routines return an error value; C routines as the return result
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of the function and Fortran routines in the last argument.
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.sp
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Before the error value is returned, the current MPI error handler associated
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with the communication object (e.g., communicator, window, file) is called.
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If no communication object is associated with the MPI call, then the call is
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considered attached to MPI_COMM_SELF and will call the associated MPI error
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handler. When MPI_COMM_SELF is not initialized (i.e., before
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\fI\%MPI_Init\fP/\fI\%MPI_Init_thread\fP, after \fI\%MPI_Finalize\fP, or when using the Sessions
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Model exclusively) the error raises the initial error handler. The initial
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error handler can be changed by calling \fI\%MPI_Comm_set_errhandler\fP on
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MPI_COMM_SELF when using the World model, or the mpi_initial_errhandler CLI
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argument to mpiexec or info key to \fI\%MPI_Comm_spawn\fP/\fI\%MPI_Comm_spawn_multiple\fP\&.
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If no other appropriate error handler has been set, then the MPI_ERRORS_RETURN
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error handler is called for MPI I/O functions and the MPI_ERRORS_ABORT error
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handler is called for all other MPI functions.
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.sp
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Open MPI includes three predefined error handlers that can be used:
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.INDENT 0.0
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.IP \(bu 2
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\fBMPI_ERRORS_ARE_FATAL\fP
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Causes the program to abort all connected MPI processes.
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.IP \(bu 2
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\fBMPI_ERRORS_ABORT\fP
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An error handler that can be invoked on a communicator,
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window, file, or session. When called on a communicator, it
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acts as if \fI\%MPI_Abort\fP was called on that communicator. If
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called on a window or file, acts as if \fI\%MPI_Abort\fP was called
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on a communicator containing the group of processes in the
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corresponding window or file. If called on a session,
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aborts only the local process.
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.IP \(bu 2
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\fBMPI_ERRORS_RETURN\fP
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Returns an error code to the application.
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.UNINDENT
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.sp
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MPI applications can also implement their own error handlers by calling:
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.INDENT 0.0
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.IP \(bu 2
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\fI\%MPI_Comm_create_errhandler\fP then \fI\%MPI_Comm_set_errhandler\fP
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.IP \(bu 2
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\fI\%MPI_File_create_errhandler\fP then \fI\%MPI_File_set_errhandler\fP
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.IP \(bu 2
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\fI\%MPI_Session_create_errhandler\fP then \fI\%MPI_Session_set_errhandler\fP or at \fI\%MPI_Session_init\fP
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.IP \(bu 2
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\fI\%MPI_Win_create_errhandler\fP then \fI\%MPI_Win_set_errhandler\fP
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.UNINDENT
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.sp
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Note that MPI does not guarantee that an MPI program can continue past
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an error.
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.sp
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See the \fI\%MPI man page\fP for a full list of \fI\%MPI error codes\fP\&.
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.sp
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See the Error Handling section of the MPI\-3.1 standard for
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more information.
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.sp
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\fBSEE ALSO:\fP
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.INDENT 0.0
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.INDENT 3.5
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.INDENT 0.0
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.IP \(bu 2
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\fI\%MPI_Mprobe\fP
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.IP \(bu 2
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\fI\%MPI_Probe\fP
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.IP \(bu 2
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\fI\%MPI_Iprobe\fP
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.IP \(bu 2
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\fI\%MPI_Mrecv\fP
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.IP \(bu 2
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\fI\%MPI_Imrecv\fP
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.IP \(bu 2
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\fI\%MPI_Cancel\fP
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.UNINDENT
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.UNINDENT
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.UNINDENT
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.SH COPYRIGHT
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2003-2025, The Open MPI Community
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.\" Generated by docutils manpage writer.
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