[R-sig-hpc] multicore mclapply hangs when 'debug' loaded

[Rune Schjellerup Philosof]

Dirk Eddelbuettel skrev:
> On 10 August 2009 at 13:55, Rune Schjellerup Philosof wrote:
> | When I execute mclapply it creates the needed processes, but these
> | processes never begin computing anything, they just wait indefinitely.
>   

I discovered that it occurs when I have loaded the 'debug' package at
the same time as the 'multicore' package.
However, I use a version of the 'debug' package that hasn't been
released yet.
Still though, it also some times happen when I don't have 'debug' loaded
(I just realized because of the sessionInfo included below).
But at the moment I have to load the 'debug' package to make the bug
appear (just loading mvbutils does not cause the effect).

> Would you have a reproducible example?  
>   
Start R --vanilla:
library(debug)
library(multicore)
example(mclapply)

> | I recently upgraded to version 2.9.1, which might have caused the problem.
>
> That would surprise me but one never knows.
>   

I mention it because the debug package stopped working because of
non-backwards-compatible changes.

> | I use Ubuntu 8.10.
> | 
> | > sessionInfo()
> | R version 2.9.1 (2009-06-26)
> | x86_64-pc-linux-gnu
> | 
> | locale:
> | LC_CTYPE=da_DK.UTF-8;LC_NUMERIC=C;LC_TIME=da_DK.UTF-8;LC_COLLATE=da_DK.UTF-8;LC_MONETARY=C;LC_MESSAGES=da_DK.UTF-8;LC_PAPER=da_DK.UTF-8;LC_NAME=C;LC_ADDRESS=C;LC_TELEPHONE=C;LC_MEASUREMENT=da_DK.UTF-8;LC_IDENTIFICATION=C
> | 
> | attached base packages:
> | [1] stats     graphics  grDevices utils     datasets  methods   base
> | 
> | other attached packages:
> | [1] multicore_0.1-3
> | 
> | loaded via a namespace (and not attached):
> | [1] tcltk_2.9.1 tools_2.9.1
> | 
> | 
> | 
> | 
> | -- 
> | Med venlig hilsen
> | Rune Schjellerup Philosof
> | Ph.d.-studerende, Statistik, IST, SDU
> | 
> | Telefon:  6550 3607
> | E-mail:   rphilosof at health.sdu.dk
> | Adresse:  J.B. Winsløwsvej 9, 5000 Odense C
> | 
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>
>   


-- 
Med venlig hilsen
Rune Schjellerup Philosof
Ph.d.-studerende, Statistik, IST, SDU

Telefon:  6550 3607
E-mail:   rphilosof at health.sdu.dk
Adresse:  J.B. Winsløwsvej 9, 5000 Odense C