[ESS] R starts slowly in ESS
maechler at stat.math.ethz.ch
Wed May 23 15:55:33 CEST 2007
>>>>> "Georg" == Georg Otto <georg.otto at tuebingen.mpg.de>
>>>>> on Wed, 23 May 2007 11:39:41 +0200 writes:
Georg> "Richard M. Heiberger" <rmh at temple.edu> writes:
>> We need all the information that the R posting guide requests
>> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>> at least the computer name and operating system.
Georg> Sorry, I forgot to add the operating system, I am working on a Mac and
Georg> I do not observe the mentioned problems on a Linux installation of R
Georg> 2.5 and ESS 5.3.4
Georg> Meanwhile, I found out that the problem is dependent on the presence
Georg> of a saved workspace in a .RData file. For example, if I start R with
Georg> ESS in a new directory that does not contain a .RData file, it takes
Georg> 2-3 seconds to show the prompt and this message appears:
>> if(!exists("baseenv", mode="function")) baseenv <- function() NULL
>> options(STERM='iESS', editor='gnuclient -q')
Georg> After generating a .RData file by creating a vector a<-c(1:10) and
Georg> exiting R with saving the workspace, re-starting R takes about 45
Georg> seconds and a different prompt appears (without the aforementioned
Georg> [1m[Previously saved workspace restored]
Georg> Starting R from the bash shell however does not show this difference.
Georg> Here is the output of sessionInfo():
Georg> R version 2.5.0 (2007-04-23)
Georg> attached base packages:
Georg>  "stats" "graphics" "grDevices" "utils" "datasets" "methods"
Georg>  "base"
Thank you, Georg, for the extra detail.
First an important "ESS-philosophical" remark:
Using a saved .RData is really very ``ESS-unlike''
I'd say that
``Real ESS-aficionados'' believe that the "Source is Real"
and never save workspaces -- I really never ever do.
I occasionally do save(..) on specific (lists of) objects, which
I load() back when needed, but I never use save.image() nor the
equivalent of q('yes')
Now to what you really wanted to know;
I think what happens may be the followoing:
Your .RData contains a lot of R objects (which I'd call "Junk" ;-).
When starting R from the console, these objects are not ``really
activated'' (but only "promises" are),
whereas ESS does --- for the sake of later object name completion ---
"look" at all objects available in search().
Martin Maechler, ETH Zurich
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