78 строки
2.5 KiB
Plaintext
78 строки
2.5 KiB
Plaintext
.\" Copyright 2010 Cisco Systems, Inc. All rights reserved.
|
|
.\" Copyright 2006-2008 Sun Microsystems, Inc.
|
|
.\" Copyright (c) 1996 Thinking Machines
|
|
.TH MPI_Get_address 3 "#OMPI_DATE#" "#PACKAGE_VERSION#" "#PACKAGE_NAME#"
|
|
.SH NAME
|
|
\fBMPI_Get_address\fP \- Gets the address of a location in memory.
|
|
|
|
.SH SYNTAX
|
|
.ft R
|
|
.SH C Syntax
|
|
.nf
|
|
#include <mpi.h>
|
|
int MPI_Get_address(void *\fIlocation\fP, MPI_Aint *\fIaddress\fP)
|
|
|
|
.fi
|
|
.SH Fortran Syntax
|
|
.nf
|
|
INCLUDE 'mpif.h'
|
|
MPI_GET_ADDRESS(\fILOCATION, ADDRESS, IERROR\fP)
|
|
<type> \fILOCATION\fP(*)
|
|
INTEGER \fIADDRESS, IERROR\fP
|
|
|
|
.fi
|
|
.SH C++ Syntax
|
|
.nf
|
|
#include <mpi.h>
|
|
MPI::Aint MPI::Get_address(void* \fIlocation\fP)
|
|
|
|
.fi
|
|
.SH INPUT PARAMETERS
|
|
.ft R
|
|
.TP 1i
|
|
location
|
|
Location in caller memory (choice).
|
|
|
|
.SH OUTPUT PARAMETERS
|
|
.ft R
|
|
.TP 1i
|
|
address
|
|
Address of location (integer).
|
|
.TP 1i
|
|
IERROR
|
|
Fortran only: Error status (integer).
|
|
|
|
.SH DESCRIPTION
|
|
.ft R
|
|
MPI_Get_address returns the byte address of a location in memory.
|
|
.sp
|
|
Example: Using MPI_Get_address for an array.
|
|
.sp
|
|
.nf
|
|
EAL A(100,100)
|
|
.fi
|
|
.br
|
|
INTEGER I1, I2, DIFF
|
|
.br
|
|
CALL MPI_GET_ADDRESS(A(1,1), I1, IERROR)
|
|
.br
|
|
CALL MPI_GET_ADDRESS(A(10,10), I2, IERROR)
|
|
.br
|
|
DIFF = I2 - I1
|
|
.br
|
|
! The value of DIFF is 909*sizeofreal; the values of I1 and I2 are
|
|
.br
|
|
! implementation dependent.
|
|
.fi
|
|
|
|
.SH NOTES
|
|
.ft R
|
|
Current Fortran MPI codes will run unmodified and will port to any system. However, they may fail if addresses larger than 2^32 - 1 are used in the program. New codes should be written so that they use the new functions. This provides compatibility with C/C++ and avoids errors on 64-bit architectures. However, such newly written codes may need to be (slightly) rewritten to port to old Fortran 77 environments that do not support KIND declarations.
|
|
|
|
.SH ERRORS
|
|
Almost all MPI routines return an error value; C routines as the value of the function and Fortran routines in the last argument. C++ functions do not return errors. If the default error handler is set to MPI::ERRORS_THROW_EXCEPTIONS, then on error the C++ exception mechanism will be used to throw an MPI::Exception object.
|
|
.sp
|
|
Before the error value is returned, the current MPI error handler is
|
|
called. By default, this error handler aborts the MPI job, except for I/O function errors. The error handler may be changed with MPI_Comm_set_errhandler; 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.
|
|
|