I would like to use the plumber package to carry out some flexible parallel processing and was hoping it would work within a node.js framework such that it is non-blocking...
I have the following plumber file.
# myfile.R
#* @get /mean
normalMean <- function(samples=10){
Sys.sleep(5)
data <- rnorm(samples)
mean(data)
}
I have also installed pm2 as suggested here http://plumber.trestletech.com/docs/hosting/
I have also made the same run-myfile.sh file i.e.
#!/bin/bash
R -e "library(plumber); pr <- plumb('myfile.R'); pr\$run(port=4000)"
and made it executable as suggested...
I have started up pm2 using
pm2 start /path/to/run-myfile.sh
and wanted to test to see if it could carry out a non-blocking node.js framework...
by opening up another R console and running the following...
foo <- function(){
con <- curl::curl('http://localhost:4000/mean?samples=10000',handle = curl::new_handle())
on.exit(close(con))
return(readLines(con, n = 1, ok = FALSE, warn = FALSE))
}
system.time(for (i in seq(5)){
print(foo())
})
Perhaps it is my miss-understanding of how a node.js non-blocking framework is meant to work, but in my head the last loop should take only a bit of over 5 seconds. But it seems to take 25 seconds, suggesting everything is sequential rather than parallel.
How could I use the plumber package to carry out that non-blocking nature?
