R help - Apr 2010 - Efficiency of C Compiler in "R CMD SHLIB"

Dear R experts:

I attempted to compile c source code  into DLL using "R CMD SHLIB" but
I
found the DLL run in R is almost twice slower than the codes compiled in C++
6.0 when I chose "release" option and is as fast as the situation
where I
chose "debug" option in C++ 6.0.  I wonder how to improve the
efficiency of
DLL compiled by gcc compiler in R.  Thanks in advance!

Xin 
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yehengxin wrote:
> 
> Dear R experts:
> 
> I attempted to compile c source code  into DLL using "R CMD
SHLIB" but I
> found the DLL run in R is almost twice slower than the codes compiled in
> C++ 6.0 when I chose "release" option and is as fast as the
situation
> where I chose "debug" option in C++ 6.0.  I wonder how to improve
the
> efficiency of DLL compiled by gcc compiler in R.  Thanks in advance!
> 
> Xin 
> 
What operating system are you using?

What is "C++ 6.0"?

What do you mean by "release" and "debug".  How do these
settings alter the
invocation of the compiler?

The answers to these questions can help us provide insight on your first
question.


For your last question, on UNIX/Linux platforms gcc is invoked by R CMD
SHLIB with the flags specified in $R_HOME/etc/<system
architecture>/Makeconf
.  Important entries are:

  SHLIB_CFLAGS
  SHLIB_CXXFLAGS
  SHLIB_FFLAGS


Hope this helps.

-Charlie

-----
Charlie Sharpsteen
Undergraduate-- Environmental Resources Engineering
Humboldt State University
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I am using 32-bit Window XP. 
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