You would want to use the "user" time since that indicates that amount of time it spends in the user application, which would be R. Take a look at the ratio between user and system; user should be much higher than system. If not, then this might indicate that you have a lot of I/O going on, or some other activity requiring the operating system (e.g., memory allocation, paging, console updating, etc.). Here is an example of a CPU intensive operation and you can see that the system time is zero:
> system.time(for (i in 1:1000) runif(1e4)) user system elapsed 1.24 0.00 1.36 > system.time(for (i in 1:1000) runif(1e5)) # user time should be about 10X > larger user system elapsed 14.72 0.00 14.83 > On 10/28/07, kevinchang <[EMAIL PROTECTED]> wrote: > > Hi all, > > Since proc.time return three different kind of times (user, system and > elapsed) , I am wondering which one is right for calculating flops. In New S > Language (Becker et. al. ) , it seems to be the user because " the user time > measures the processor time used in S and the system time measures the > operating system in response to S's request". But in R Help , system time > sounds better as " The first two entries(referred to user and system time > respectively) are the total user and system CPU times of the current R > process and any child processes on which it has waited". Please help . > Thanks. > > > > > > -- > View this message in context: > http://www.nabble.com/flops-calculation-tf4708965.html#a13459745 > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > 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. > -- Jim Holtman Cincinnati, OH +1 513 646 9390 What is the problem you are trying to solve? ______________________________________________ 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.
