[R] (low level) profiling of code

[Prof Brian Ripley]

You normally need to switch R profiling off, as that uses the same
interrupts as low-level profiling.

I would expect you to get gmon.out output from the the main R executable 
on any run, so the first question must be `does your OS support -pg?'

I don't think dynamically loaded code is relevant (provided it is compiled
with -pg).  I am pretty sure I managed to profile some examples from the
cluster package on RH8.0 Linux the other day.

On Mon, 7 Jun 2004, Liaw, Andy wrote:

> Dear R-help,
> 
> Can some one tell me how to profile compiled code dynamically loaded into R?
> Here's what I tried on our dual Opteron running SUSE Linux Enterprise Server
> 8 (GCC 3.3):
> 
> Start with R-patched dated 2004-06-07: 
> 
> (I also had MAIN_CFLAGS="-pg" in config.site.)
> 
> R is now configured for x86_64-unknown-linux-gnu
> 
>   Source directory:          .
>   Installation directory:    /usr/local
> 
>   C compiler:                gcc  -O2 -g -pg -march=k8 -msse2 -m64
>   C++ compiler:              g++  -O2 -g -pg -march=k8 -msse2 -m64
>   Fortran compiler:          g77  -O2 -g -pg -march=k8 -msse2 -m64
> 
>   Interfaces supported:      X11, tcltk
>   External libraries:        readline
>   Additional capabilities:   PNG, JPEG
>   Options enabled:           R profiling
> 
>   Recommended packages:      no
> 
> I then tried running 
> 
>   /path/to/R-patched/bin/R CMD BATCH -q -slave myscript.R
> 
> where inside myscript.R is call to R functions that calls .C().  However,
> this does not produce the gmon.out file.  Can anyone tell me what I'm
> missing?  Any help much appreciated!


-- 
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 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595