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By default, TileDB will use all available cores on a given machine. In multi-user or multi-process settings, one may want to reduce the number of core. This function will take a given number, or default to smaller of the ‘Ncpus’ options value or the ‘"OMP_THREAD_LIMIT"’ enviroment variable (or two as hard fallback).


limitTileDBCores(ncores, verbose = FALSE)



Value of CPUs used, if missing the smaller of a fallback of two, the value of ‘Ncpus’ (if set) and the value of environment variable ‘"OMP_THREAD_LIMIT"’ is used.


Optional logical toggle; if set, a short message is displayed informing the user about the value set.


The modified configuration object is returned invisibly.


As this function returns a config object, its intended use is as argument to the context creating functions: ctx <- tiledb_ctx(limitTileDBCores()). To check that the values are set (or at a later point, still set) the config object should be retrieved via the corresponding method and this ctx object: cfg <- config(ctx).