Hi all, I got this time for my code,> proc.time()-ptuser system elapsed 132541.743 0.004 132533.526 As you can see, there is huge difference btw elapsed time and system time. Does that mean lots of I/O? Or some bad coding? Thanks, Libo [[alternative HTML version deleted]]
R. Michael Weylandt
2012-Feb-22 03:11 UTC
[R] Huge difference btw system time and elapsed time
The time relationships aren't strictly linear between any of the three measures, but *very generally* I've interpreted them as something like: User: stuff you do (i.e., doing all the commands) System: stuff at the OS level (memory allocations and whatnot) Elapsed: Clock time None is a great measure in isolation, but the system time is not the worrisome one here: it looks like your script takes about a day and a half to run....that might be ok (and perhaps unavoidable) but it looks like there might be value in trying to squeeze some speed out of your script. A simple thing like byte-compiling that gives 2x speedup would be huge here. Michael On Tue, Feb 21, 2012 at 10:06 PM, Libo Sun <libosun at rams.colostate.edu> wrote:> Hi all, > > I got this time for my code, > >> proc.time()-pt > ? ? ?user ? ? system ? ?elapsed > 132541.743 ? ? ?0.004 132533.526 > > As you can see, there is huge difference btw elapsed time and system time. > Does that mean lots of I/O? Or some bad coding? > > Thanks, > Libo > > ? ? ? ?[[alternative HTML version deleted]] > > ______________________________________________ > R-help at 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.