[ESS-bugs] ess-mode 15.09-1 [elpa: 20151013.1025]; iESS Performance Degrades Quickly with Buffer Size

[Jason Morgan]

Sorry, I see you have already submitted a bug report.

On Wed, Oct 14, 2015 at 1:23 PM, Jason Morgan <jason.w.morgan at gmail.com> wrote:
> On Wed, Oct 14, 2015 at 10:55 AM, Martin Maechler
> <maechler at stat.math.ethz.ch> wrote:
>> Actually, I just tried myself, also with 15.09, and
>> very embarrassingly:
>>
>>      Houston, we'got a problem !
>>
>> Try our old ESS internal (ess/etc/slow-long-output.R) :
>>
>> ###  Example modified from Paul Johnson's post to ESS-help, Nov.25, 2013
>> op <- options("max.print")
>>
>> ##' construct (random) character vector of length n,  of about 10 characters each
>> mkCh <- function(n) {
>>     if(getOption("max.print") <= n) options(max.print = n + 1) ## <-
>>     if(n == 10) stop("error's message with apostrophe - work's in developer mode")
>>     N <- pmin(26,pmax(1, rpois(n, 10)))
>>     cbind(vapply(N, function(m) paste(sample(letters, m), collapse=""), ""))
>> }
>>
>> set.seed(1)
>> y <- mkCh(9999)
>> system.time(print(y))
>>
>> ## which in current ESS 15.09-1  took about 13 seconds for me,
>> but only less 1.9 secondes in  ESS 14.09
>>
>> Or the *much* more extreme (for ESS 15.09-1):
>>
>> set.seed(23456)
>> y <- mkCh(50000)
>> system.time(print(y))
>>
>>
>> ## which basically freezes emacs after printing an initial part
>>
>> --> so we are back at the very bad behavior Vitalie may
>> remember  we had in Decemeber 2013
>>
>> ESS-core members: do look at
>>
>>   https://stat.ethz.ch/mailman/private/ess-core/2013/007622.html
>>
>>
>> ----
>>
>> So indeed, Jason, we have a big problem, already in the release
>> ESS 15.09.
>>
>> Thanks a lot for your report!
>> Martin
>
> Thanks, Martin. I'm glad (I guess?) it's not just me. Will this bug be
> posted to GitHub, so I can watch it's status? I'm just getting into
> development in emacs and I would be interested to see what the problem
> is.
>
> --
> ~ Jason Morgan
>
> "Those who have had no share in the good fortunes of the mighty
>  Often have a share in their misfortunes."
>                 -- Bertolt Brecht, "Der Kaukasische Kreidekreis"
>                                     (The Caucasian Chalk Circle)



-- 
~ Jason Morgan

"Those who have had no share in the good fortunes of the mighty
 Often have a share in their misfortunes."
                -- Bertolt Brecht, "Der Kaukasische Kreidekreis"
                                    (The Caucasian Chalk Circle)