[R] system.time

[jim holtman]

This is an indication of the amount of CPU resources that you are
using.  Elapsed time is just the number of seconds that the R process
(e.g., RGUI) has been running.  "user" time is the amount of CPU that
any commands/scripts have used that you are running; this is the one
that you are typically interested in.  'system' time is the amount of
CPU that the operating system has used to run your script; in most
cases this should be a lot less than 'user'.  The reason is might be
high is if you are doing a lot of I/O, or running short of physical
memory and having to 'page' parts of it to disk.  For a CPU intensive
application, I like user:system to be at least 10:1.

"sprinkle" proc.time() throughout your code (actually
print(proc.time() so you get output when running a script or in a
function).  You will have to determine what the characteristics are
for your script/application.

On Mon, Nov 28, 2011 at 12:50 AM, Jorge I Velez
<jorgeivanvelez at gmail.com> wrote:
> Hi Vikram,
>
> Check ?system.time and ?proc.time.
>
> HTH,
> Jorge.-
>
>
> On Mon, Nov 28, 2011 at 12:41 AM, Vikram Bahure <> wrote:
>
>> Dear R users.
>>
>> I wanted to know, how do we read the output of system.time. It would be
>> helpful if you could let me know what are user system and elapsed.
>>
>> Regards
>> Vikram
>>
>>        [[alternative HTML version deleted]]
>>
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>> PLEASE do read the posting guide
>> http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>
>
>        [[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.
>



-- 
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.