On 18/04/2013 14:22, Kaiyin Zhong (Victor Chung) wrote:
Thanks.
So is there a way to get the number of cpu cores in R?
Yes, for various definitions of 'core'. Try ??cores which gets you to
parallel::detectCores Detect the Number of CPU Cores
And BTW 'snow' is not part of 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
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