Hi : I looked at the help for system.time but I still have the following
question. Can someone explain the output following output
of system.time :
user system elapsed
12399.681 5632.352 56935.647
Here's my take based on the fact that I was doing ps -aux | grep R off and
on and the total amount of CPU minutes that
got allotted before the job ended was about 5 hours and the total actual
time that the job took was about 15 hours.
Does elapsed = total actual time job taken ? That seems to be the case or a
strange coincidence.
Does user + system = CPU time from ps -aux | grep R ? That seems to be the
case also or a weird coincidence.
Finally, why can't the CPU get a higher percentage ? It's seems like it's
always around 30% which would make sense since
5 is ~ 30% of 15 hours.
Also, assuming my take above is correct, when talking about timing of
algorithms, in this case, does one say the job took 5 hours or 15 hours ?
I'm trying to see how fast an algorithm is compared to others and I'm not
sure what the standard is. I'm on fedora 16.0 and using R 2.15. Thanks.
[[alternative HTML version deleted]]
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
