Oh, well, now that the post count is growing I guess I have to
respond ;).
On Jan 11, 2009, at 15:50 , Dirk Eddelbuettel wrote:
On 11 January 2009 at 20:18, Prof Brian Ripley wrote:
| Those of you tracking R development will have noticed that we are
| moving towards using R as a scripting engine.
[...]
| Reasons:
|
| - it is platform-independent and needs no other tools installed.
[...]
| - it is fast.
[...]
Indeed. I really like working with r scripts.
And littler by Horner and Eddelbuettel is faster than Rscript -- see
eg the
scripts tests/timing.sh and tests/timing2.sh in the SVN archive /
littler
tarballs (and the results below for illustration).
Well, if we enter that territory then rcmd from Rserve is much faster
than littler:
--- GNU bc doing the addition 10 times
real 0m0.029s
user 0m0.009s
sys 0m0.028s
--- rcmd doing the addition 10 times
real 0m0.090s
user 0m0.010s
sys 0m0.022s
--- our r doing the addition 10 times
real 0m0.294s
user 0m0.199s
sys 0m0.091s
--- GNU R's Rscript doing the addition 10 times
real 0m1.626s
user 0m1.241s
sys 0m0.357s
--- GNU R doing the addition 10 times
real 0m2.883s
user 0m2.424s
sys 0m0.426s
(littler and timig.sh script from http://littler.googlecode.com/svn/trunk
with loopRcmd added)
Yes, the comparison is unfair, but that applies to littler and Rscript
as well. Once you start making direct comparisons the story is a bit
different:
--- our r doing the addition 10 times
real 0m0.297s
user 0m0.200s
sys 0m0.091s
--- GNU R's Rscript doing the addition 10 times
real 0m0.390s
user 0m0.219s
sys 0m0.163s
(Rscript is now run with R_DEFAULT_PACKAGES=NULL since that is what
littler really does).
.. and for timing2.sh (again, comparing Rcmd is technically a bit
unfair, but the net effect for the user is good):
--- rcmd calling summary() 20 times
real 0m0.439s
user 0m0.019s
sys 0m0.045s
--- our r calling summary() 20 times
real 0m2.619s
user 0m2.089s
sys 0m0.476s
--- GNU R's Rscript calling summary() 20 times
real 0m2.435s
user 0m1.793s
sys 0m0.590s
--- GNU R calling summary() 20 times
real 0m5.789s
user 0m4.892s
sys 0m0.829s
so in fact Rscript is here faster than littleR!
(R 2.8.1 32-bit, Mac OS X 10.5.6, bash shell (due to echo bug), Quad
2.66GHz Xeon, littler from SVN, rcmd from SVN, Rserve 0.5-2)
We should still appreciate it you could finally acknowledge
existence of littler it in the R / Rscript documentation. You are
not doing users any service by pretending it doesn't exist.
I don't think anyone is pretending anything. If users want littler
specifically, they will find it, but I don't see why it should have
anything to do with the R documentation - it's not part of R ...
Cheers,
S
PS: No, I'm not advertising Rserve here - it has its own place, but I
wouldn't really use it for running random scripts. I have added it to
the mix just to show that there is always a tradeoff, so it's
important to know what is compared in benchmarks...
That said, we are not (yet ?) building r for Windows, and I
appreciate that Rscript is available there. Maintenance and use of
R will be easier with a consistent set of tools. This is a good move.
Dirk
e...@ron:~/svn/littler/tests> ./timing.sh
--- GNU bc doing the addition 10 times
real 0m0.028s
user 0m0.004s
sys 0m0.012s
--- our r doing the addition 10 times
real 0m0.400s
user 0m0.308s
sys 0m0.052s
--- GNU R's Rscript doing the addition 10 times
real 0m2.077s
user 0m1.832s
sys 0m0.204s
--- GNU R doing the addition 10 times
real 0m3.974s
user 0m3.728s
sys 0m0.228s
e...@ron:~/svn/littler/tests> ./timing2.sh
--- our r calling summary() 20 times
real 0m3.261s
user 0m2.976s
sys 0m0.240s
--- GNU R's Rscript calling summary() 20 times
real 0m4.164s
user 0m3.624s
sys 0m0.548s
--- GNU R calling summary() 20 times
real 0m8.087s
user 0m7.552s
sys 0m0.492s
e...@ron:~/svn/littler/tests>
--
Three out of two people have difficulties with fractions.
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