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mpi_alloc_mem(3openmpi) [osx man page]

MPI_Alloc_mem(3OpenMPI) 												   MPI_Alloc_mem(3OpenMPI)

NAME
MPI_Alloc_mem - Allocates a specified memory segment. SYNTAX
C Syntax #include <mpi.h> int MPI_Alloc_mem(MPI_Aint size, MPI_Info info, void *baseptr) Fortran Syntax (see FORTRAN NOTES) INCLUDE 'mpif.h' MPI_ALLOC_MEM(SIZE, INFO, BASEPTR, IERROR) INTEGER INFO, IERROR INTEGER(KIND=MPI_ADDRESS_KIND) SIZE, BASEPTR C++ Syntax #include <mpi.h> void* MPI::Alloc_mem(MPI::Aint size, const MPI::Info& info) INPUT PARAMETERS
size Size of memory segment in bytes (nonnegative integer). info Info argument (handle). OUTPUT PARAMETERS
baseptr Pointer to beginning of memory segment allocated. IERROR Fortran only: Error status (integer). DESCRIPTION
MPI_Alloc_mem allocates size bytes of memory. The starting address of this memory is returned in the variable base. FORTRAN NOTES
There is no portable FORTRAN 77 syntax for using MPI_Alloc_mem. There is no portable Fortran syntax for using pointers returned from MPI_Alloc_mem. However, MPI_Alloc_mem can be used with Sun Fortran compilers. From FORTRAN 77, you can use the following non-standard declarations for the SIZE and BASEPTR arguments: INCLUDE "mpif.h" INTEGER*MPI_ADDRESS_KIND SIZE, BASEPTR From either FORTRAN 77 or Fortran 90, you can use "Cray pointers" for the BASEPTR argument. Cray pointers are described further in the For- tran User's Guide and are supported by many Fortran compilers. For example, INCLUDE "mpif.h" REAL*4 A(100,100) POINTER (BASEPTR, A) INTEGER*MPI_ADDRESS_KIND SIZE SIZE = 4 * 100 * 100 CALL MPI_ALLOC_MEM(SIZE,MPI_INFO_NULL,BASEPTR,IERR) ! use A CALL MPI_FREE_MEM(A, IERR) 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++ func- tions 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. 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. SEE ALSO
MPI_Free_mem Open MPI 1.2 September 2006 MPI_Alloc_mem(3OpenMPI)

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MPI_Alloc_mem(3)							MPI							  MPI_Alloc_mem(3)

NAME
MPI_Alloc_mem - Allocate memory for message passing and RMA SYNOPSIS
int MPI_Alloc_mem(MPI_Aint size, MPI_Info info, void *baseptr) INPUT PARAMETERS
size - size of memory segment in bytes (nonnegative integer) info - info argument (handle) OUTPUT PARAMETER
baseptr - pointer to beginning of memory segment allocated NOTES
Using this routine from Fortran requires that the Fortran compiler accept a common pointer extension. See Section 4.11 (Memory Allocation) in the MPI-2 standard for more information and examples. Also note that while baseptr is a void * type, this is simply to allow easy use of any pointer object for this parameter. In fact, this argument is really a void ** type, that is, a pointer to a pointer. 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 guarentee 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_INFO - Invalid Info 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_NO_MEM - Insufficient memory available for allocation by MPI_Alloc_mem LOCATION
alloc_mem.c 5/20/2010 MPI_Alloc_mem(3)
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