Number of Threads
Set or report the number of cores to be used for multi-threaded operations. A wrapper for the RcppParallel function setThreadOptions (Allaire et al. 2019).
setNumThreads(ncores, ...)
ncores |
integer number of threads to use |
... |
other arguments passed to |
If ncores is NULL then the current value of the environment variable RCPP_PARALLEL_NUM_THREADS is used. RCPP_PARALLEL_NUM_THREADS defaults to 2 at the start of a session (assuming at least 2 logical cores available).
Calling setNumThreads() with no arguments is a handy way to check how many threads are in use.
The value of RCPP_PARALLEL_NUM_THREADS is also reset when a multi-threaded function such as secr.fit is called with a non-NULL value of the ncores argument. This value applies in later calls of secr.fit with ncores = NULL until changed.
The new value of the environment variable RCPP_PARALLEL_NUM_THREADS.
The mechanism for setting the number of threads changed between versions 4.1.0 and 4.2.0. The default number of cores is now capped at 2 to meet CRAN requirements. Setting ncores = NULL previously specified one less than the number of available cores.
Allaire, J. J., Francois, R., Ushey, K., Vandenbrouck, G., Geelnard, M. and Intel (2019) RcppParallel: Parallel Programming Tools for 'Rcpp'. R package version 4.4.4. https://CRAN.R-project.org/package=RcppParallel.
# determine current number of threads setNumThreads() # set new number of threads setNumThreads(2) ## Not run: # a call to secr.fit that specifies 'ncores' also sets the # number of threads, as we see here fit <- secr.fit(captdata, trace = FALSE, ncores = 8) setNumThreads() ## End(Not run)
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