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Set the number of threads used by dbn

Source: R/threads.R
set_dbn_threads.Rd

Controls the number of OpenMP threads used for parallel MCMC updates in the dynamic model. Parallelization applies to the row-wise A and B FFBS updates and variance computations. The setting persists for the current R session until changed.

For best performance, set to the number of physical (not logical) cores. Speedup scales with network size: expect 2–4x improvement with 4–8 cores for networks with 15+ actors. For small networks the overhead of thread management can exceed the benefit.

Requires OpenMP support at compile time (standard on Linux and Windows; on macOS install via brew install libomp). Without OpenMP the package runs single-threaded regardless of this setting.

Usage

set_dbn_threads(n_threads = NULL)

Arguments

n_threads

Integer number of threads to use for parallel computation. Use NULL to reset to default (1 thread).

Value

The previous value of n_threads (invisibly)

See also

get_dbn_threads

Examples

set_dbn_threads(4)
set_dbn_threads(parallel::detectCores(logical = FALSE))
set_dbn_threads(NULL)