Michael,
On Jun 12, 2009, at 4:20 PM, Michael Braun wrote:
Hi. I have a shared library that I would like to profile. I see
that this issue has been touched on in some previous posts, but I am
still having trouble, and I am hoping someone here can help.
First things first... I am running R 2.8.0 patched on OS X 10.5.7,
on a dual quad-core Mac Pro. It is the 64-bit binary build for
Leopard, as downloaded from CRAN.
I am compiling my code using gcc-4.2, and I am including the -g -p -
pg flags.
The -p -pg part (they are mutually-exclusive aren't they? so you get
just -pg) won't really help unless you also compile R that way since
the gprof initialization happens in the executable, not in the library
(and don't forget it at link time).
Optimization is turned off (-O0).
Just to make sure - using PKG_CFLAGS doesn't have the desired effect,
because R's -O2 will override it, so better be sure that the
optimization is off. If you run the steps manually, make sure you have
-g (and -pg if you wish) everywhere.
I AM able to debug the code using gdb (called as R -d gdb). I
always run R from the command line.
I have tried profiling using Shark, which recognizes functions in
libR.dylib, but none of the functions in mylib.so. For each
function call, Shark refers to "Unknown Library", and after the
function address, there is an indicator of [unknown]. Also, when I
use Shark, it appears to want to profile the entire R session. All
I care about is my library.
I'm unable to replicate that. Shark correctly recognizes the function
and the loaded library for me. Try using default flags - they do
include -g -O2 (which worked for me).
I am also open to using gprof instead, but I cannot find the
requisite gmon.out file.
See above - you won't find it unless you compile R with -pg since the
gprof init code must be in the executable (more precisely you don't
have to re-compile the entire R with that, it should be sufficient to
use -pg in the link step for exec/R).
Cheers,
Simon
Thanks in advance for any suggestions.
Michael
-------------------------------------------
Michael Braun
Homer A. Burnell Career Development Professor, and
Assistant Professor of Management Science (Marketing Group)
MIT Sloan School of Management
One Amherst St., E40-169
Cambridge, MA 02142
bra...@mit.edu
617-253-3436
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