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#' Creates a pool of workers
#'
#' @param n_jobs Number of jobs to submit (0 implies local processing)
#' @param data Set common data (function, constant args, seed)
#' @param reuse Whether workers are reusable or get shut down after call
#' @param template A named list of values to fill in template
#' @param log_worker Write a log file for each worker
#' @param qsys_id Character string of QSys class to use
#' @param verbose Print message about worker startup
#' @param ... Additional arguments passed to the qsys constructor
#' @return An instance of the QSys class
#' @export
workers = function(n_jobs, data=NULL, reuse=TRUE, template=list(), log_worker=FALSE,
qsys_id=getOption("clustermq.scheduler", qsys_default),
verbose=FALSE, ...) {
if (n_jobs == 0)
qsys_id = "LOCAL"
gc() # be sure to clean up old zmq handles (zeromq/libzmq/issues/1108)
qsys = get(toupper(qsys_id), envir=parent.env(environment()))
p = Pool$new(reuse=reuse)
# p$add(qsys, n_jobs, log_worker=log_worker, verbose=verbose, ...)
args = c(list(qsys=qsys, n=n_jobs, log_worker=log_worker, verbose=verbose), template, list(...))
do.call(p$add, args)
p
}
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