Hi, Ilias. I think that is not ok to compare performance in different plataforms of different machines. To compare times, is necessary you execute the code at the two plataforms (Linux and Windows) in the same machine.
But the problem here is other. The advanced users explained it well. 
 
So I ask them:
Is it possible build the R (under Linux) and force the compilation make it in 32 bits (at a 64 bits machine)?
 
Thanks to all,
Cezar Freitas

--- Em seg, 29/6/09, I. Soumpasis <nono.231@gmail.com> escreveu:


De: I. Soumpasis <nono.231@gmail.com>
Assunto: Re: [R] (performance) time in Windows vs Linux
Para: "Cézar Freitas" <cafanselmo12@yahoo.com.br>
Data: Segunda-feira, 29 de Junho de 2009, 5:53


Hi Cezar,

I tried your code in a core duo laptop (@2.5Gz) with ubuntu x86_64 with 4GB of RAM. Both R and libraries are compiled from source. These are the results.
   user  system elapsed 
 23.861   0.812  25.065

It seems better than the windows. Is there a posibility that on linux you have a big workspace, or something is consuming your memory and thus R is forced to use swap memory? Just a speculation.

Ilias


PS. BTW It uses only one core.



2009/6/26 Cézar Freitas <cafanselmo12@yahoo.com.br>

  
 #windows time
 #   user  system elapsed
 #  27.81    0.00   27.82
 
 #linux usual compilation time
 #   user  system elapsed
 # 52.635   0.016  52.748
 
 #linux (my compilation) time
 #   user  system elapsed
 # 52.567   0.016  52.588
 #==============END OF CODE





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