Using parLapply()
An online seller has a hundred thousand products on their website. For the next Big Bumper Sale, they have announced a 20% discount on everything.
The online seller has hired you as a Data Engineer to handle price updates. Your client has asked you to update these prices using parallelization. You have the price_list and the function that discounts the price, discount_fun(), in your workspace. You need to apply discount_fun() to all elements of price_list. The parallel package has already been loaded.
This exercise is part of the course
Parallel Programming in R
Hands-on interactive exercise
Have a go at this exercise by completing this sample code.
discount_fun <- function(price) price * 0.8
# Make a cluster with three cores
local_cluster <- ___(___)