mpid_wtime_diff.tex

刚才是说明 现在是安装程序在 LINUX环境下进行编程的MPICH安装文件

\startmanpage
\mantitle{MPID{\tt \char`\_}Wtime{\tt \char`\_}diff}{tex}{10/7/2002}
\manname{MPID{\tt \char`\_}Wtime{\tt \char`\_}diff}
--- Compute the difference between two time stamps 
\subhead{Synopsis}
\startvb\begin{verbatim}
void MPID_Wtime_diff( MPID_Wtime_t *t1, MPID_Wtime_t *t2, double *diff )

\end{verbatim}
\endvb

\subhead{Input Parameters}
\startarg{t1, t2 }{Two time values set by {\tt MPID{\tt \char`\_}Wtime} on this process.
}
\par
\subhead{Output Parameter}
\startarg{diff }{The different in time between t2 and t1, measured in seconds.
}
\par
\subhead{Note}
If {\tt t1} is null, then {\tt t2} is assumed to be differences accumulated with
{\tt MPID{\tt \char`\_}Wtime{\tt \char`\_}acc}, and the output value gives the number of seconds that
were accumulated.
\par
\subhead{Question}
Instead of handling a null value of {\tt t1}, should we have a separate
routing {\tt MPID{\tt \char`\_}Wtime{\tt \char`\_}todouble} that converts a single timestamp to a
double value?
\par
\subhead{Module}
Timer
\endmanpage