Set the number of OpenMP threads used by the functions of package 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
Integer scalar that specifies the number of threads to be used by
boolean, controls whether to print a message
boolean, change openmp threads globally (might effect other libraries)
Changes the global variable
cpgen.threads to the value in
get_num_threads, get_max_threads, check_openmp
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
# 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 cpgen-function # generate random data rand_data(1000,10000) # 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)) ## End(Not run)
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