set_num_threads | R Documentation |
cpgen
This function sets the value of the global variable stored in options()$cpgen.threads
to the assigned integer.
Note_1: The assigned value may exceed the number of physical cores present but that might lead to dramatical
decrease in performance.
Note_2: The function can override the global variable 'OMP_NUM_THREADS' (if global=TRUE
and hence also other non-cpgen functions
are affected by a call to set_num_threads()
.
set_num_threads(x,silent=FALSE, global=FALSE)
x |
Integer scalar that specifies the number of threads to be used by |
silent |
boolean, controls whether to print a message |
global |
boolean, change openmp threads globally (might effect other libraries) |
Changes the global variable cpgen.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
set_num_threads(1)
#### Use a parallelized cpgen-function
# generate random data
rand_data(100,500)
# check single-threaded performance
system.time(W <- M%c%t(M))
# set number of threads to 2
set_num_threads(2)
# check multi-threaded performance
system.time(W <- M%c%t(M))
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