DO_CHUNK                Chunk of iterated arguments for the worker
DO_SETUP                Message contains common data
LOCAL                   Placeholder for local processing
LSF                     LSF scheduler functions
MULTICORE               Process on multiple cores on one machine
PBS                     PBS/Torque scheduler functions
PROXY_CMD               Message is an SSH command
PROXY_READY             Message ID indicating SSH proxy is ready to
                        distribute data
PROXY_STOP              Message telling the SSH proxy to clean up
PROXY_UP                Message ID indicating SSH proxy is up
Q                       Queue function calls on the cluster
QSys                    Class for basic queuing system functions
Q_rows                  Queue function calls defined by rows in a
                        data.frame
SGE                     SGE scheduler functions
SLURM                   SLURM scheduler functions
SSH                     SSH scheduler functions
WORKER_DONE             Message ID indicating worker is shutting down
WORKER_READY            Message ID indicating worker is accepting jobs
WORKER_STOP             Message ID telling worker to stop
WORKER_UP               Message ID indicating worker is accepting jobs
bind_avail              Binds an rzmq to an available port in given
                        range
check_args              Function to check arguments with which Q() is
                        called
chunk                   Subset index chunk for processing
clustermq               Evaluate Function Calls on HPC Schedulers (LSF,
                        SGE, SLURM)
master                  Master controlling the workers
purrr_lookup            Lookup table for return types to purrr
                        functions
ssh_proxy               SSH proxy for different schedulers
summarize_result        Print a summary of errors and warnings that
                        occurred during processing
vec_lookup              Lookup table for return types to vector NAs
work_chunk              Function to process a chunk of calls
worker                  R worker submitted as cluster job
workers                 Creates a pool of workers
