| proc.time {base} | R Documentation |
proc.time determines how much time (in seconds) the currently
running R process already consumed.
proc.time()
A numeric vector of length 5, containing the user, system, and total elapsed times for the currently running R process, and the cumulative sum of user and system times of any child processes spawned by it.
The resolution of the times will be system-specific; it is common for them to be recorded to of the order of 1/100 second, and elapsed time is rounded to the nearest 1/100.
It is most useful for “timing” the evaluation of R expressions,
which can be done conveniently with system.time.
It is possible to compile R without support for proc.time,
when the function will not exist.
system.time for timing a valid R expression,
gc.time for how much of the time was spent in garbage
collection.
ptm <- proc.time()
for (i in 1:50) mad(runif(500))
proc.time() - ptm