set_num_threads: Set the number of OpenMP threads used by the functions of...
In cgenpp: Parallel genomic evaluations

Description Usage Arguments Value See Also Examples

This function sets the value of the global variable stored in options()$cgenpp.threads to the assigned integer. Note: The assigned value may exceed the number of physical cores present but that might lead to dramatical decrease in performance.

1	set_num_threads(x,silent=FALSE)

`x`	Integer scalar that specifies the number of threads to be used by `cgenpp`-functions
`silent`	boolean, controls whether to print a message

Changes the global variable cgenpp.threads to the value in x

get_num_threads, get_max_threads, check_openmp

# Control the number of threads being used in an R-session:

# set the number of threads to 1
## Not run: 
set_num_threads(1)

#### Use a parallelized cgenpp-function

# generate random data
rand_data(500,5000)

# check single-threaded performance
system.time(W <- M%c%t(M))

# set number of threads to the value reported by get_max_threads()

n_threads <- get_max_threads()
set_num_threads(n_threads)

# check multi-threaded performance
system.time(W <- M%c%t(M))

## End(Not run)