[Rcpp-devel] Differences between RcppEigen and RcppArmadillo

[Davor Cubranic]

As I understand it, both Ra and the R 'compiler' package are bytecode 
JITs, so roughly like Java '.class' and Emacs '.elc' files. There is no 
current method that compiles R into machine code, which is what JIT in 
the JVM does, and which is why Java does so well in the language 
shootout [1].

Davor

[1] http://shootout.alioth.debian.org/


On 12-06-18 01:15 PM, Antonio Piccolboni wrote:
> Ooops, wrong JIT! Dirk is absolutely right. I meant to say see enableJIT
> is the compiler package, see
> http://www.r-statistics.com/2012/04/speed-up-your-r-code-using-a-just-in-time-jit-compiler/
>
> I second Dirk's comments on Ra.
>
>
> Antonio
>
> On Mon, Jun 18, 2012 at 12:53 PM, Dirk Eddelbuettel <edd at debian.org
> <mailto:edd at debian.org>> wrote:
>
>
>     On 18 June 2012 at 11:55, Antonio Piccolboni wrote:
>     |
>     |
>     | On Sun, Jun 17, 2012 at 9:09 PM, c s <conradsand.arma at gmail.com
>     <mailto:conradsand.arma at gmail.com>> wrote:
>     |
>     |      Another is
>     |     R.  I believe R currently doesn't have a JIT compiler (I haven't
>     |     checked lately), and hence the very useful Rcpp fills in the
>     |     performance gap.
>     |
>     |
>     |
>     | Still work in progress but  see
>     http://www.milbo.users.sonic.net/ra/jit.html.
>     | Doesn't replace Rcpp by any stretch of the imagination, but may
>     close the gap a
>     | little bit.
>
>     Sadly, Ra and jit are no longer maintained by Stephen Milborrow.
>
>     I actually used to provided a patched binary for this within Debian.
>     This was
>     ahead of its time (ginve the renewed interest in JITs from LLVM and
>     other
>     places) and quite useful, but Ra/jit is at this point a dead project.
>
>     Dirk
>
>     --
>     Dirk Eddelbuettel | edd at debian.org <mailto:edd at debian.org> |
>     http://dirk.eddelbuettel.com
>
>
>
>
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