How much time a process need?
The 'user' + 'system' will give you how much CPU is required which is an indication of how many of the CPU cycles you are using. The elapsed time is just how long it spent. If the script is CPU intensive, and there is no paging going on, you should see the CPU time close to the elapsed time. Longer extensions in the elapsed time is an indication of extensive I/O, or it might be an indication that you are calling another process; e.g., you have a PERL script that is parsing some data in preparation to using in R. If you are really interested, then enable the monitoring on your system and see what else is running. Use 'perfmon' on WIndows or a combination of 'ps' and 'vmstat' on UNIX/Linux systems. Run you script on a system that has nothing else running and interfering with resources and then look at the results along with the performance data from the entire system in order to create a "model" of how long things will take.
On Tue, Nov 8, 2011 at 8:31 AM, Alaios <alaios at yahoo.com> wrote:
Actually I want to have a rough approximation. A process that takes one day and a half it is good to send me how many hours it gets. It is not a problem to convert the values of system.error the major is that I am not sure If I should use the user or elapsed time for getting an estimation of how much it takes once? I press enter theh process to finish A From: Jim Holtman <jholtman at gmail.com> To: Rolf Turner <rolf.turner at xtra.co.nz> Cc: "R-help at r-project.org" <R-help at r-project.org> Sent: Tuesday, November 8, 2011 12:34 PM Subject: Re: [R] How much time a process need? could be that the process was waiting for the user to select a file from a list, or some other input before proceeding.? Would have to see what the overall performance of the system was at that point.? It could also have been that the process was low on physical memory and there was a lot of paging going on. Sent from my iPad On Nov 7, 2011, at 21:50, Rolf Turner <rolf.turner at xtra.co.nz> wrote:
On 08/11/11 02:40, Joshua Wiley wrote:
On Mon, Nov 7, 2011 at 5:32 AM, Alaios<alaios at yahoo.com>? wrote:
So I just need to get the ? ? user? system elapsed ? 0.460? 0.048? 67.366 user value and convert the seconds to days and then to hours ? Right? What about this elapsed field?
It's all in seconds.? Convert whatever fields you want.
That being said, doesn't having an elapsed time of over 67 seconds, when the actual calculation takes less than half a second, indicate that something weird is going on?? At the very least the R calculations are fighting for resources with some other very greedy processes. ? ? cheers, ? ? ? ? Rolf Turner
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______________________________________________ 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.
Jim Holtman Data Munger Guru What is the problem that you are trying to solve? Tell me what you want to do, not how you want to do it.