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Run a chunked foreach loop sequentially or in parallel

Source: R/parallel_helpers.R
with_parallel.Rd

Helper to execute a vertex-chunk loop either sequentially (e.g. for profiling) or in parallel using foreach and doParallel. The expression passed in expr is evaluated for each chunk in chuck_seq.

Usage

with_parallel(n_cores, expr, progress_file = NULL, seed = 3108, verbose = TRUE)

Arguments

n_cores

Integer number of CPU cores to use. Values greater than 1 enable parallel execution via a fork cluster; 1 forces sequential execution via registerDoSEQ().

expr

An expression to be evaluated in parallel or in sequence.

progress_file

Optional character string specifying a log file path. If NULL, worker output is discarded.

seed

Optional integer seed for reproducible %dopar% loops via doRNG::registerDoRNG().

verbose

Logical; if TRUE, prints basic messages about the selected execution mode.

Value

Invisibly returns NULL. Side effects are produced by expr.

Details

TMP: On Unix-like systems, a fork cluster is used for parallel execution (type "FORK"). On non-Unix systems this will fail anyay while FreeSurfer is required.

Author

Serena Defina, 2026.