You will get yelled at by others for posting a question as a bug... (sigh). See FAQ.
That said, your understanding of the output of system.time() is wrong. The value you are after is simply user+system. %CPU is essentially user+system/elapsed. It is elapsed which is dependent on system load, not the other two (usually). Back into replying more in the usual R-devel sarcastic style... if you don't understand what user/system/elapsed means, you really have no place studying CPU loads... [EMAIL PROTECTED] wrote: > Full_Name: Alessandra Iacobucci > Version: 2.5.1 > OS: Mac OS X 10.4.11 > Submission from: (NULL) (193.48.71.92) > > > Hi, > I am making some intensive simulations for the testing of a Population Monte > Carlo algorithm. This involves also a study of the CPU times in two different > case. > What I am trying to measure is the "real" CPU time, the one which is > independent > on the %CPU. > > I'm using the "system.time" function with gcFirst=TRUE and I realized that all > of the output values (user, system and elapsed) depend on the percentage of > the > CPU, meaning that if your program is the only one running on the machine, > system.time() gives you certain values, and if there are many programs > running > at the same time, for the exact same simulation system.time() gives you much > higher values. > > Thanks for you answer. > > Best regards, > > Alessandra Iacobucci > > ______________________________________________ > R-devel@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
