mpi_info_get_nkeys.3

mpi并行计算的c++代码 可用vc或gcc编译通过 可以用来搭建并行计算试验环境

.TH MPI_Info_get_nkeys 3 "2/9/2000" " " "MPI-2"
.SH NAME
MPI_Info_get_nkeys \-  Returns the number of currently defined keys in info 
.SH SYNOPSIS
.nf
int MPI_Info_get_nkeys(MPI_Info info, int *nkeys)
.fi
.SH INPUT PARAMETERS
.PD 0
.TP
.B info 
- info object (handle)
.PD 1

.SH OUTPUT PARAMETERS
.PD 0
.TP
.B nkeys 
- number of defined keys (integer)
.PD 1

.SH NOTES FOR FORTRAN
All MPI routines in Fortran (except for 
.I MPI_WTIME
and 
.I MPI_WTICK
) have
an additional argument 
.I ierr
at the end of the argument list.  
.I 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
.I call
statement.

All MPI objects (e.g., 
.I MPI_Datatype
, 
.I MPI_Comm
) are of type 
.I INTEGER
in Fortran.
.SH LOCATION
info_getnks.c