table of contents
MPI_Wtick(3) | Open MPI | MPI_Wtick(3) |
NAME¶
MPI_Wtick - Returns the resolution of MPI_Wtime.SYNTAX¶
C Syntax¶
#include <mpi.h> double MPI_Wtick()
Fortran Syntax¶
INCLUDE 'mpif.h' DOUBLE PRECISION MPI_WTICK()
C++ Syntax¶
#include <mpi.h> double MPI::Wtick()
RETURN VALUE¶
Time in seconds of resolution of MPI_Wtime.DESCRIPTION¶
MPI_Wtick returns the resolution of MPI_Wtime in seconds. That is, it returns, as a double-precision value, the number of seconds between successive clock ticks. For example, if the clock is implemented by the hardware as a counter that is incremented every millisecond, the value returned by MPI_Wtick should be 10^-3.Note that on POSIX platforms, Open MPI should always return 10^-6 for MPI_Wtick. The returned value may be different on Windows platforms.
NOTE¶
This function does not return an error value. Consequently, the result of calling it before MPI_Init or after MPI_Finalize is undefined.SEE ALSO¶
MPI_Wtime
January 31, 2017 | 2.0.2 |