[R-SIG-Mac] Different performance with different R versions

[Peter Dalgaard]

I don't think there has been anything mentioned about slowdowns of that magnitude, but it's been 3.5 years since 3.1.3.

Would it be possible to narrow down what kind of code has become slow? 

Since the OS version is different, I assume the first timing is historical and not easily redone, but if it is now using like 70 times as long as before, chances are that it is spending 69/70 of the time in the same few places.

One generic frequent cause of grief with simulations is to keep onto the fitted models in entirety, including model frames etc., causing massive memory build-up.

-pd

> On 12 Dec 2018, at 17:39 , Cowan, R (MERIT) <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?
> 
> 
> Thanks,
> Robin Cowan
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-- 
Peter Dalgaard, Professor,
Center for Statistics, Copenhagen Business School
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