[R] Problem parallelizing across cores

Bert Gunter bgunter@4567 @end|ng |rom gm@||@com
Thu Aug 29 00:39:28 CEST 2019

I would suggest that that you search on "parallel computing" at the
Rseek.org site. This brought up what seemed to be many relevant hits
including, of course, the High Performance and parallel Computing Cran task


Bert Gunter

"The trouble with having an open mind is that people keep coming along and
sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )

On Wed, Aug 28, 2019 at 3:18 PM James Spottiswoode <
james.spottiswoode using gmail.com> wrote:

> Hi All,
> I have a piece of well optimized R code for doing text analysis running
> under Linux on an AWS instance.  The code first loads a number of packages
> and some needed data and the actual analysis is done by a function called,
> say, f(string).  I would like to parallelize calling this function across
> the 8 cores of the instance to increase throughput.  I have looked at the
> packages doParallel and future but am not clear how to do this.  Any method
> that brings up an R instance when the function is called will not work for
> me as the time to load the packages and data is comparable to the execution
> time of the function leading to no speed up.  Therefore I need to keep a
> number of instances of the R code running continuously so that the data
> loading only occurs once when the R processes are first started and
> thereafter the function f(string) is ready to run in each instance.  I hope
> I have put this clearly.
> I’d much appreciate any suggestions.  Thanks in advance,
> James Spottiswoode
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