[R-sig-hpc] set priority for R processes in spawned nodes using SNOW

Murray Stokely murray at stokely.org
Wed Mar 2 04:21:53 CET 2011

There is probably a more direct way to do this with SNOW, but one way
you can change the priority of a running R instance on Unix is with
renice.  You could use this as the first R code your spawned tasks run

> system(paste("renice 10 -p", Sys.getpid()))
20121: old priority 0, new priority 10

There's probably a way to hook this or similar commands into the
initialization code when spawning the worker tasks with SNOW.

            - Murray

On Tue, Mar 1, 2011 at 7:09 PM, Zhongyi Yuan <zhongyi-yuan at uiowa.edu> wrote:
> Dear R users:
> I am doing parallel computing by the SNOW package on Linux workstations.
> According to the university's policy, one has to set a "nice" value of at
> least 10 (Initiating R with the command *nice -n 10 R* does the job) for a
> long-running process, to lower its priority.
> The problem I have is though I can set a "nice" value for R in the mater, I
> don't know how it can be done in the slaves. All R processes in the slaves
> have to be niced before they start.
> Can anyone help me with this? I'd appreciate it.
> Best,
> Zhongyi
>        [[alternative HTML version deleted]]
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