[Rcpp-devel] Question on performance

[Jordi Molins]

Hello, I am new in this distribution list. I am using Rcpp for my project,
and I enjoy the Rcpp implementation quite a lot.

I have read the paper
https://www.sas.upenn.edu/~jesusfv/Update_March_23_2018.pdf and I see the
performance of Rcpp is about 4x times slower than C++ proper code, or 3x
times slower than Numba/Cython Python code.

Do you think that these figures are realistic? Of course, performance
calculations are always dependent on many factors (very often, not
explicit). But I am surprised that Rcpp is that slow in comparison to C++
code. I do not understand that Rcpp may be so slow, unless there are many
calls back and forth between Rcpp and R. The same for compiled Python code
vis a vis Rcpp.

Or maybe I am wrong?

Jordi Molins i Coronado
+34 69 38 000 59
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