Return Process CPU and real time that an expression used.
A expression to be timed.
A bench_time object with two values.
process - The process CPU usage of the expression evaluation.
real - The wallclock time of the expression evaluation.
On some systems (such as macOS) the process clock has lower precision than the realtime clock, as a result there may be cases where the process time is larger than the real time for fast expressions.
# This will use ~.5 seconds of real time, but very little process time. system_time(Sys.sleep(.5))#> process real #> 86µs 505ms