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use C++11 functionality to determine wall time

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This commit is contained in:
Axel Kohlmeyer
2021-10-05 21:52:52 -04:00
parent fcdabe0002
commit b2c4f08bbc
2 changed files with 16 additions and 22 deletions
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17
src/platform.h
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@ -27,25 +27,30 @@ namespace platform {
/*! Return the consumed CPU time for the current process in seconds
*
* This is a wrapper around the POSIX function getrusage() and its Windows equivalent.
* It is to be used in a similar fashion than MPI_Wtime().
* It is to be used in a similar fashion than MPI_Wtime(). Its resolution may
* be rather low so it can only be trusted when observing processes consuming at
* seconds or more of CPU time.
*
* \return used CPU time in second */
* \return used CPU time in seconds */
double cputime();
/*! Return the wall clock state for the current process in seconds
*
* This is a wrapper around the gettimeofday() function and its Windows equivalent.
* It is to be used in a similar fashion than MPI_Wtime().
* This this clock is counting continuous time is initialized during
* Load of the executable/library. Its absolute value must be considered
* arbitrary and thus elapsed wall times are measured in taking differences.
* It is therefore to be used in a similar fashion as MPI_Wtime() but
* has a different offset, usually leading to better resolution.
*
* \return wall clock time in second */
* \return wall clock time in seconds */
double walltime();
/*! Suspend execution for a microsecond interval
*
* This emulates the usleep(3) BSD function call also mentioned in POSIX.1-2001.
* This is not a precise delay; it may be longer, but not shorter.
*
* \param usec length of delay in microseconds */