Dear Steven, Thanks for your post. It explains a lot. The reason I wanted to use multiple sessions simultaneously is that because when I run something it usually takes quite a while (calculating distance matrices), meaning that I have to wait before R can handle the next task. Also RAM is reaching its limits quite often resulting in shutdown, so I wanted to split one task into pieces which indeed similar to cluster computing. I will check documentation on this topic.
Kind regards, Olga On Tue, 2010-08-03 at 13:04 -0700, Steven McKinney wrote: > Dear Olga > An R session is conducted entirely in the RAM memory of your computer, > and each invocation of R will have its own memory space, not shared > with any other application, including another R session. > > You will have to architect a scheme to allow one R session to find out > about events and objects in another R session. This might involve writing > files to disk from session R1, having session R2 check the directory > for new files every now and then, and so on. (save.image() saves > objects from one R session to a file on disk, but there can be other items > in the saved file such as environments that are not straightforward > to manipulate or investigate from another R session.) > > Your situation is similar to cluster computing, where a task is broken up > into independent pieces and each piece is handled by a separate R process. > Reading about cluster computing with R might help you figure out > strategies to share bits of data and information across multiple R sessions. > > HTH > > > Steven McKinney > ________________________________________ > From: r-help-boun...@r-project.org [r-help-boun...@r-project.org] On Behalf > Of Olga Lyashevska [o...@herenstraat.nl] > Sent: August 3, 2010 8:04 AM > To: r-help@r-project.org > Cc: Olga Lyashevska > Subject: [R] multiple R sessions from one working directory using GNU screen > > Dear all, > > I am using GNU screen to run multiple R sessions from one working > directory in order to split task, however I noticed that dataset is not > synchronized e.g. if I have two sessions R1 and R2, and I remove an > object from R1, R2 doesn't change as expected or change at random. > I have tried to save.image(), q() and then restart both sessions, but it > does not help. > > > Any suggestions? > > Many thanks > Olga > > R version 2.11.1 (2010-05-31) > 2010 x86_64 GNU/Linux > Ubuntu 10.04.1 LTS > Intel(R) Xeon(R) CPU X3220 @ 2.40GHz > MemTotal: 4050180 kB > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
