[R] multi-machine parallel setup?

[Uwe Ligges]

On 21.04.2012 06:34, ivo welch wrote:
> the vignette to the library(parallel) mentions snow repeatedly (esp
> differences in its implementation in parallel from the original).
> unfortunately, it doesn't give an example or tutorial for
> multi-machine use with sockets.
>
> could someone please point me to a simple working example, where a
> master just has both itself and a 4-core slave on a second machine
> (IP), and wants to execute an mclapply on a list on both machines,
> like
>
>     master.ip<- "localhost"
>     slave.ip<- "Rfriend at 192.168.2.10"  ## has key ssh access
>     mclapply( 1:100, function(x) { cat(x); Sys.sleep(1); x } )  # on both, please
>
> iaw



With appropriate ssh keys that do not need passwords and with the same 
username on all machines, it should work out of the box. At least, it 
does for me:

Say you want two, one on your own machine, the other one on your friends:

  cl <- makeCluster(c("localhost", "192.168.2.10"), "SOCK")

BEst,
Uwe Ligges


>
> On Wed, Apr 18, 2012 at 1:01 PM, ivo welch<ivo.welch at gmail.com>  wrote:
>> Dear R experts:
>>
>> could someone please point me to a page that explains how to set up
>> more than 1 machine for library parallel (which is quickly becoming my
>> favorite!)
> ...
>
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