"Rscript performance issue"

creatX

Hi all,

I'm using Rstudio to write my R code and I want to use it in Rapidminer. The Rscript extension is great. But I realized that code which will execute in Rstudio within less than 1 second will take up to 12 seconds in Rapidminer with the Rscript extension. For small datasets this is not really a problem. But for huge datasets I'm running into perfomance issues.

Did you face similiar issues? Is there any workaround to solve this problem?

A minimal example is:

[tt]# rm_main is a mandatory function,
# the number of arguments has to be the number of input ports (can be none)
rm_main = function(data)
{
require(fields)
lotlan <- cbind(data$C_1,data$C_2)
xy1 <- lotlan[1:length(data$C_1),]
xy2 <- rbind(lotlan[2:length(data$C_1),],c(NA,NA))
GeoDistance <- rdist.earth.vec(xy1, xy2)
data2 <- cbind(data,GeoDistance)
return(data2)
}[/tt]

where data$C_1,data$C_2 represent geocoordinates.

Best regards,
creatX

David_A

Hi,

indeed there is a performance gap between executing your code directly in R or via the Rscript extension. The reason is the communication overhead when passing the data between RapidMiner and R, but on the other hand the interface is very robust and easy to install.
The only "workaround" is to reduce the amount of data passed between R and RapidMiner.

Best,
David