R help - Aug 2006 - rpvm/snow packages on a cluster with dual-processor machi nes

Caveat: I've only played with this a couple of years ago... 

I believe you can just add each host _twice_ (or as many times as the number
of CPUs at that host) to get both CPUs to work.

Andy

From: Paul Y. Peng
> 
> Hi,
> 
> does anybody know how to use the dual processors in the 
> machines of a cluster? I am using R with rpvm and snow 
> packages. I usually start pvm daemon and add host machines 
> first, and then run R to start my computing work. But I find 
> that only one processor in each machine is used in this way 
> and the other one always stays idle. Is there any simple way 
> to tell pvm to use the two processors at the same time? In 
> other words, I would like to see two copies of R running on 
> each machine's two processors when using pvm. Any hints/help 
> are greatly appreciated.
> 
> Paul.
> 
> ______________________________________________
> R-help at stat.math.ethz.ch 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.
> 
>

Hi,

Adding a node twice gives a duplicate node error.
However, adding the parameter sp=2000 to your pvm hostfile should enable 
dual processors.

Ryan

Liaw, Andy wrote:
>Caveat: I've only played with this a couple of years ago... 
>
>I believe you can just add each host _twice_ (or as many times as the number
>of CPUs at that host) to get both CPUs to work.
>
>Andy
>
>From: Paul Y. Peng
>  
>
>>Hi,
>>
>>does anybody know how to use the dual processors in the 
>>machines of a cluster? I am using R with rpvm and snow 
>>packages. I usually start pvm daemon and add host machines 
>>first, and then run R to start my computing work. But I find 
>>that only one processor in each machine is used in this way 
>>and the other one always stays idle. Is there any simple way 
>>to tell pvm to use the two processors at the same time? In 
>>other words, I would like to see two copies of R running on 
>>each machine's two processors when using pvm. Any hints/help 
>>are greatly appreciated.
>>
>>Paul.
>>
>>______________________________________________
>>R-help at stat.math.ethz.ch 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 at stat.math.ethz.ch 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.
>  
>

That's what I've tried before, on three dual-Xeon boxes, so I know it
worked
(as documented a that time).

Andy 

From: Paul Y. Peng
> 
> Luke Tierney just reminded me that makeCluster() can take a 
> number greater than the number of machines in a cluster. It 
> seems to be a solution to this problem. But I haven't tested it yet.
> 
> Paul.
> 
> 
> Ryan Austin wrote:
> > Hi,
> > 
> > Adding a node twice gives a duplicate node error.
> > However, adding the parameter sp=2000 to your pvm hostfile should 
> > enable dual processors.
> > 
> > Ryan
> > 
> > Liaw, Andy wrote:
> > 
> >> Caveat: I've only played with this a couple of years ago... 
> >>
> >> I believe you can just add each host _twice_ (or as many 
> times as the 
> >> number of CPUs at that host) to get both CPUs to work.
> >>
> >> Andy
> >>
> >> From: Paul Y. Peng
> >>  
> >>
> >>> Hi,
> >>>
> >>> does anybody know how to use the dual processors in the 
> machines of 
> >>> a cluster? I am using R with rpvm and snow packages. I 
> usually start 
> >>> pvm daemon and add host machines first, and then run R to 
> start my 
> >>> computing work. But I find that only one processor in 
> each machine 
> >>> is used in this way and the other one always stays idle. Is
there
> >>> any simple way to tell pvm to use the two processors at the
same
> >>> time? In other words, I would like to see two copies of R 
> running on 
> >>> each machine's two processors when using pvm. Any
hints/help are
> >>> greatly appreciated.
> >>>
> >>> Paul.
> >>>
> >>> ______________________________________________
> >>> R-help at stat.math.ethz.ch 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 at stat.math.ethz.ch 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 at stat.math.ethz.ch 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 at stat.math.ethz.ch 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.
> 
>