[R-sig-hpc] parallel and "nicing" on Windows

[Russell Pierce]

Maybe you'd already looked this far, but if not, there is almost always a
hackish way to interact with other bits of the system via system/system2
and the right external utility.  So, what I offer is not entirely in R, but
it uses what R does easily expose.  Specifically, Sys.getpid() in base will
give you the pid of the current session.  From there you can use system or
system2 to issue a command to change the priority, e.g.

system(paste0('wmic process where ProcessId=',Sys.getpid(),' CALL
setpriority "Idle"'))

Best,

Russell

On Fri, Jun 19, 2015 at 6:03 AM <r-sig-hpc-request at r-project.org> wrote:

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> Date: Thu, 18 Jun 2015 16:20:28 +0000
> From: Jonathan Greenberg <jgrn at illinois.edu>
> To: "r-sig-hpc at r-project.org" <r-sig-hpc at r-project.org>
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> R-sig-hpc'ers:
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> We recently ran into an issue on our Windows application server where a
> researcher spawned more workers than cores via parallel backend + a foreach
> job, and, of course, this made the server more or less unusable to anyone
> else while they were running.  We were able to solve this by manually
> changing the priority on the spawned processes to low priority, but this
> brought up a question -- is there a way to set the spawned processes to low
> priority on Windows (or renice them on linux/pc) from within R?  Ideally
> this would be when the parallel cluster is launched.  Thoughts?
>
> --j
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