[R] Snowfall: "cannont open connection " problem (repost in plain text)

From: <Edmond.Ng_at_lshtm.ac.uk>
Date: Thu, 24 Jun 2010 12:09:39 +0100


<< Apologies for posting my question in HTML earlier. Reposted in plain text now.>>

Dear R-listers,

I have been using Snowfall (version 1.84) for parallel computing on a quad-PC running Windows 7 for a month or so without much problem. I started having problems runnnig R with Snowfall over our network when a new Novell client was installed for Windows 7. I experinenced network mapping problem with this new client. Our network colleague provided a fix which worked but a little unstable. So I decided to copy every file that I need from the networked drive to my local drive and ran R locally instead. I had no problem with R running locally for many long R jobs until this morning when Snowfall has stopped working completely. PLease note my R is installed locally.

Snowfall has been complaining about not being able to open a connection. I am not sure what it means as I am not a network person. Any advice will be very welcome. Many thanks in advance. See output and the error message below.

Best wishes,
Edmond

> # perform parallel calculations
> rr <- list()
> date()
[1] "Thu Jun 24 09:17:56 2010"
> el.time <- system.time(

+ 
+ for (i in 1:(n.sims/everyout)) {
+  loop.start <- i*everyout -(everyout-1) 
+  loop.end <- i*everyout 
+  print(paste("loop.start = ",loop.start)) 
+  print(paste("loop.end = ",loop.end)) 
+ 
+  rr[[i]] <- sfClusterApplyLB(loop.start:loop.end,wrapper1,reps) 
+  a<-rr[[i]]
+  save(a,file=paste("rr_",i,".RData",sep=""))
+ }
+ )

[1] "loop.start = 1"
[1] "loop.end = 10"
Error in checkForRemoteErrors(val) :
  10 nodes produced errors; first error: cannot open the connection Timing stopped at: 0 0 0.06
************** END OF OUTPUT AND ERROR MESSAGE *******************

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