Thanks.
So is there a way to get the number of cpu cores in R?
Best regards,
Kaiyin ZHONG
------------------------------
FMB, Erasmus MC
k.zh...@erasmusmc.nl
kindlych...@gmail.com
On Thu, Apr 18, 2013 at 3:18 PM, Jon Olav Skoien <
jon.sko...@jrc.ec.europa.eu> wrote:
> I also wanted to add the result from my Windows machine (R 3.0.0) to the
> answer below:
>
>
> > ncore = system('nproc')
> > ncore
> [1] 127
> # My machine was not happy about starting a cluster with 127 nodes though.
>
> Best wishes,
> Jon
>
>
> On 18-Apr-13 15:13, Jon Olav Skoien wrote:
>
>> I dont think this has anything to do with the snow package, you should
>> rather start by checking what is the output of system('nproc') is on your
>> computer, and also whether it is possible to assign this to a variable. I
>> tried on a redhat linux (R 2.15.0) server:
>>
>> > ncore = system('nproc')
>> 16
>> > ncore
>> [1] 0
>> # the result is printed, not returned
>>
>>
>> Best wishes,
>> Jon
>>
>> On 18-Apr-13 10:52, Kaiyin Zhong (Victor Chung) wrote:
>>
>>> Dear all,
>>>
>>> I found a strange thing with the snow package.
>>>
>>> This will work:
>>> y = matrix(1:4, 2)
>>> cl = makeCluster(rep('localhost', 8), type='SOCK')
>>> parMM(cl, y, y)
>>>
>>> This will not:
>>>
>>> y = matrix(1:4, 2)
>>> ncore = system('nproc')
>>> parMM(cl, y, y)
>>> Error in cut.default(i, breaks) : invalid number of intervals
>>>
>>> I also tried:
>>> cl = makeCluster(rep('localhost', ncore), type='SOCK')
>>> cl = makeCluster(rep('localhost', as.integer(ncore)), type='SOCK')
>>>
>>> no luck.
>>>
>>>
>>> Could anyone please help? Thanks!
>>>
>>>
>>>
>>>
>>>
>>>
>>> Best regards,
>>>
>>> Kaiyin ZHONG
>>> ------------------------------
>>> FMB, Erasmus MC
>>> k.zh...@erasmusmc.nl
>>> kindlych...@gmail.com
>>>
>>> [[alternative HTML version deleted]]
>>>
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>>> PLEASE do read the posting guide http://www.R-project.org/**
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>>>
>>
>>
>>
>
> --
> Jon Olav Skøien
> Joint Research Centre - European Commission
> Institute for Environment and Sustainability (IES)
> Land Resource Management Unit
>
> Via Fermi 2749, TP 440, I-21027 Ispra (VA), ITALY
>
> jon.sko...@jrc.ec.europa.eu
> Tel: +39 0332 789206
>
> Disclaimer: Views expressed in this email are those of the individual and
> do not necessarily represent official views of the European Commission.
>
>
>
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