mpi_sizeof(3) [debian man page]
MPI_Sizeof(3) Open MPI MPI_Sizeof(3) NAME
MPI_Sizeof - Returns the size, in bytes, of the given type SYNTAX
Fortran Syntax INCLUDE 'mpif.h' MPI_SIZEOF(X, SIZE, IERROR) <type> X INTEGER SIZE, IERROR INPUT PARAMETER
X A Fortran variable of numeric intrinsic type (choice). OUTPUT PARAMETERS
SIZE Size of machine representation of that type (integer). IERROR Error status (integer). DESCRIPTION
MPI_SIZEOF returns the size (in bytes) of the machine representation of the given variable. It is a generic Fortran type and has a Fortran binding only. This routine is similar to the sizeof builtin in C/C++. However, if given an array argument, it returns the size of the base element, not the size of the whole array. NOTES
This function is not available in C/C++ because it is not necessary. 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 the MPI man page for a full list of MPI error codes. 1.4.5 Feb 10, 2012 MPI_Sizeof(3)
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MPI_Type_match_size(3OpenMPI) MPI_Type_match_size(3OpenMPI) NAME
MPI_Type_match_size - Returns an MPI datatype of a given type and size SYNTAX
C Syntax #include <mpi.h> int MPI_Type_match_size(int typeclass, int size, MPI_Datatype *type) Fortran Syntax INCLUDE 'mpif.h' MPI_TYPE_MATCH_SIZE(TYPECLASS, SIZE, TYPE, IERROR) INTEGER TYPECLASS, SIZE, TYPE, IERROR C++ Syntax #include <mpi.h> static MPI::Datatype MPI::Match_size(int typeclass, int size) INPUT PARAMETERS
typeclass Generic type specifier (integer). size Size, in bytes, of representation (integer). OUTPUT PARAMETERS
type Datatype with correct type and size (handle). IERROR Fortran only: Error status (integer). DESCRIPTION
The function returns an MPI datatype matching a local variable of type (typeclass, size). The returned type is a reference (handle) to a predefined named datatype, not a duplicate. This type cannot be freed. The value of typeclass may be set to one of MPI_TYPECLASS_REAL, MPI_TYPECLASS_INTEGER, or MPI_TYPECLASS_COMPLEX, corresponding to the desired datatype. MPI_type_match_size can be used to obtain a size-specific type that matches a Fortran numeric intrinsic type: first call MPI_Sizeof to com- pute the variable size, then call MPI_Type_match_size to find a suitable datatype. In C and C++, use the sizeof builtin instead of MPI_Sizeof. It is erroneous to specify a size not supported by the compiler. 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 the MPI man page for a full list of MPI error codes. SEE ALSO
MPI_Sizeof MPI_Type_get_extent Open MPI 1.2 September 2006 MPI_Type_match_size(3OpenMPI)