[Rd] profiling C code

[Prof Brian Ripley]

On Mon, 20 Feb 2006, Liaw, Andy wrote:

> The last time I tried I didn't have much luck.  The gprof manual I could
> find seems to indicate that it can not profile code that are dynamically
> loaded.  (I was trying on Linux.)  The R source seems to hint otherwise.

grof is not mentioned in any of the R manuals, so what are your referring 
to?  (R-admin talks about `to compile a profiling version of R', not of 
shared libraries.)

> I'd very much appreciate pointers as well.

You need to use sprof rather than gprof.  Here's one relevant thread:

http://tolstoy.newcastle.edu.au/~rking/R/devel/05/02/2351.html

and I am pretty sure there have been others.

Linux has very sketchy info on sprof.  However,

http://people.redhat.com/drepper/dsohowto.pdf

has some.  I've thought about putting something about this in the
R-exts manual


>
> Andy
>
> From: Ross Boylan
>>
>> Does anyone have any advice about profiling C/C++ code in a package
>> under R?  Does R need to be built specially for this to work?
>>
>> The FAQ has some entries about profiling but they cover R level
>> profiling; I'm try to get at the C++ code I've written that is called
>> from R.
>>
>> Primary target is Mac OS X.
>>
>> Thanks.
>>
>> Ross Boylan
>>
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>>
>
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-- 
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