[R] Different performance with different R versions

[MacQueen, Don]

Probably more appropriate for R-SIG-Mac

--
Don MacQueen
Lawrence Livermore National Laboratory
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Livermore, CA 94550
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Lab cell 925-724-7509
 
 

On 12/11/18, 12:22 AM, "R-help on behalf of cowan robin" <r-help-bounces using r-project.org on behalf of r.cowan using maastrichtuniversity.nl> wrote:

    I am running a small simulation, and getting very different run times when I use different versions of R. 
    Two set-ups using the same machine (MacBook Pro 2013 vintage)
    
    1. R version 3.1.3  running on system OS X 10.9.5
    
    > system.time(source("simulationR-R.R"))
    
      user  system elapsed 
      3.890   0.061   3.965 
    
    
    
    Compared to
    
    
    2. R version 3.5.1  running on system OS X 10.12.6
    
    > system.time(source("simulationR-R.R"))
    
      user  system elapsed 
    277.924   2.087 280.841 
    
    
    The source code is identical. This is a pretty big difference running the same code on the same hardware.
    Before submitting the code, is this a known issue?
    
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