[R-SIG-Mac] macOS may not give R much time in a long compute

[Prof Brian Ripley]

Are you using R.app (you failed to say)?

If so, have you acted on the documentation about 'app nap'?  E.g. §4.1 
of the R-admin manual.

On 18/02/2023 12:31, Spencer Graves wrote:
> Hello:
> 
> 
>        During a long compute (in a while loop), I've asked R to report 
> progress via:
> 
> 
> # Progress report every 3 minutes
>    et3i <- proc.time()-startT3i
>    if(max(et3i)>180){
>      startT3i <- proc.time()
>      cat('iscan = ', iscan3, '; et3i = ',
>          round(et3i[1:3]), '\n')
>    }
> 
> 
>        When it's running properly, I get something like the following:
> 
> 
> iscan =  22992 ; et3i =  180 26 104
> 
> 
>        However if I leave my computer running unattended, I can get 
> reports like the following:
> 
> 
> iscan =  32124 ; et3i =  22 1 180
> 
> 
>        Evidently, macOS 11.7.4 decided NOT to give time to R.
> 
> 
>        Suggestions?
>        Thanks,
>        Spencer Graves
> 
> 
>   sessionInfo()
> R version 4.2.2 (2022-10-31)
> Platform: x86_64-apple-darwin17.0 (64-bit)
> Running under: macOS Big Sur 11.7.4
> 
> Matrix products: default
> LAPACK: 
> /Library/Frameworks/R.framework/Versions/4.2/Resources/lib/libRlapack.dylib
> 
> locale:
> [1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8
> 
> attached base packages:
> [1] stats     graphics  grDevices utils     datasets  methods   base
> 
> loaded via a namespace (and not attached):
> [1] compiler_4.2.2 tools_4.2.2    knitr_1.42     xfun_0.37
>  >


-- 
Brian D. Ripley,                  ripley using stats.ox.ac.uk
Emeritus Professor of Applied Statistics, University of Oxford