Note, this only applies for OpenMP and Intel Thread Building Blocks backends.
rth.nthreads() will determine the maximum number of threads to use by
checking against the environment variable
RTH_NUM_THREADS (and in the
case of OpenMP,
OMP_NUM_THREADS), and failing that, the default for
the given backend. For OpenMP this means that the number of cores
(physical+logical) will be returned. For Intel Thread Building Blocks, the
default is the value
For any function taking
nthreads= as an argument, the priority is
(highest to lowest):
|nthreads argument in the R-level Rth function|
|RTH_NUM_THREADS environment variable|
|OMP_NUM_THREADS environment variable (for OpenMP backends)|
|Number of cores|
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