Set thread options (number of threads to use for task scheduling and stack size per-thread) for RcppParallel.
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Number of threads to use for task scheduling. Call
Stack size (in bytes) to use for worker threads. The default used for "auto" is 2MB on 32-bit systems and 4MB on 64-bit systems (note that this parameter has no effect on Windows).
RcppParallel is automatically initialized with the default number of threads
and thread stack size when it loads. You can call
any time to change the defaults.
parallelReduce() also accept
an argument, if you'd like to control the number of threads specifically
to be made available for a particular parallel function call. Note that
this value is advisory, and TBB may choose a smaller number of threads
if the number of requested threads cannot be honored on the system.
defaultNumThreads() returns the default number of threads used by
RcppParallel, if another value isn't specified either via
setThreadOptions() or explicitly in calls to
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