Prof Brian Ripley
ripley at stats.ox.ac.uk
Mon Jul 23 14:59:31 CEST 2001
On Mon, 23 Jul 2001, Agustin Lobo wrote:
> The manual entry for system.time refers to
> "user, system, and total elapsed times for the currently running R
> Is user time the time spent by the process itself and system time the
> time spent on other system activities?
These are reported by your (presumably Unix?) system. Most likely both
times are spent by the R process, the `user' time in the user code space,
and the `system' time in kernel calls.
Look up the times system call on your system for the exact details.
For example, Solaris says
The tms_utime member is the CPU time used while executing
instructions in the user space of the calling process.
The tms_stime member is the CPU time used by the system on
behalf of the calling process.
On Unix-alikes, system.time calls proc.time whose C code calls times.
Brian D. Ripley, ripley at stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272860 (secr)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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