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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  argu-ments: arguments:
       ments:
                  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 Fortran User's Guide and are supported by many Fortran  compil-ers. compilers.
       ers.  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++ 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.

       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)