datatable.options.nthreads

datatable.options.
nthreads
=
new_nthreads
source

This option controls the number of threads used by datatable for parallel calculations.

Parameters

return
int

Current nthreads value. Initially, this option is set to the value returned by C++ call std::thread::hardware_concurrency(), and usually equals to the number of available cores.

new_nthreads
int

New nthreads value. It can be greater or smaller than the initial setting. For example, setting nthreads = 1 will force the library into a single-threaded mode. Setting nthreads to 0 will restore the initial value equal to the number of processor cores. Setting nthreads to a value less than 0 is equivalent to requesting that fewer threads than the maximum.