Defines the underlying parallelization mode for parallelMap(). Also allows
to set a “level” of parallelization. Only calls to parallelMap()
with a matching level are parallelized. The defaults of all settings are
taken from your options, which you can also define in your R profile. For an
introductory tutorial and information on the options configuration, please go
to the project's github page at https://github.com/mlr-org/parallelMap.
parallelStart(
mode,
cpus,
socket.hosts,
bj.resources = list(),
bt.resources = list(),
logging,
storagedir,
level,
load.balancing = FALSE,
show.info,
suppress.local.errors = FALSE,
reproducible,
...
)parallelStartLocal(show.info, suppress.local.errors = FALSE, ...)
parallelStartMulticore(
cpus,
logging,
storagedir,
level,
load.balancing = FALSE,
show.info,
reproducible,
...
)
parallelStartSocket(
cpus,
socket.hosts,
logging,
storagedir,
level,
load.balancing = FALSE,
show.info,
reproducible,
...
)
parallelStartMPI(
cpus,
logging,
storagedir,
level,
load.balancing = FALSE,
show.info,
reproducible,
...
)
parallelStartBatchJobs(
bj.resources = list(),
logging,
storagedir,
level,
show.info,
...
)
parallelStartBatchtools(
bt.resources = list(),
logging,
storagedir,
level,
show.info,
...
)
(character(1))
Which parallel mode should be used: “local”, “multicore”,
“socket”, “mpi”, “BatchJobs”. Default is the option
parallelMap.default.mode or, if not set, “local” without parallel
execution.
(integer(1))
Number of used cpus. For local and BatchJobs mode this argument is ignored.
For socket mode, this is the number of processes spawned on localhost, if
you want processes on multiple machines use socket.hosts. Default is the
option parallelMap.default.cpus or, if not set, parallel::detectCores()
for multicore mode, max(1, [mpi.universe.size][Rmpi::mpi.universe.size] - 1) for mpi mode and 1 for socket mode.
character
Only used in socket mode, otherwise ignored. Names of hosts where parallel
processes are spawned. Default is the option
parallelMap.default.socket.hosts, if this option exists.
list
Resources like walltime for submitting jobs on HPC clusters via BatchJobs.
See BatchJobs::submitJobs(). Defaults are taken from your BatchJobs
config file.
list
Analog to bj.resources.
See batchtools::submitJobs().
(logical(1))
Should slave output be logged to files via sink() under the storagedir?
Files are named <iteration_number>.log and put into unique subdirectories
named parallelMap_log_<nr> for each subsequent parallelMap()
operation. Previous logging directories are removed on parallelStart if
logging is enabled. Logging is not supported for local mode, because you
will see all output on the master and can also run stuff like traceback()
in case of errors. Default is the option parallelMap.default.logging or,
if not set, FALSE.
(character(1))
Existing directory where log files and intermediate objects for BatchJobs
mode are stored. Note that all nodes must have write access to exactly this
path. Default is the current working directory.
(character(1))
You can set this so only calls to parallelMap() that have exactly the
same level are parallelized. Default is the option
parallelMap.default.level or, if not set, NA which means all calls to
parallelMap() are are potentially parallelized.
(logical(1))
Enables load balancing for multicore, socket and mpi.
Set this to TRUE if you have heterogeneous runtimes.
Default is FALSE
(logical(1))
Verbose output on console for all further package calls? Default is the
option parallelMap.default.show.info or, if not set, TRUE.
(logical(1))
Should reporting of error messages during function evaluations in local
mode be suppressed? Default ist FALSE, i.e. every error message is shown.
(logical(1))
Should parallel jobs produce reproducible results when setting a seed?
With this option, parallelMap() calls will be reproducible when using
set.seed() with the default RNG kind. This is not the case by default
when parallelizing in R, since the default RNG kind "Mersenne-Twister" is
not honored by parallel processes. Instead RNG kind "L'Ecuyer-CMRG" needs
to be used to ensure paralllel reproducibility.
Default is the option parallelMap.default.reproducible or, if not set,
TRUE.
(any)
Optional parameters, for socket mode passed to
parallel::makePSOCKcluster(), for mpi mode passed to
parallel::makeCluster() and for multicore passed to
parallel::mcmapply() (mc.preschedule (overwriting load.balancing),
mc.set.seed, mc.silent and mc.cleanup are supported for multicore).
Nothing.
Currently the following modes are supported, which internally dispatch the mapping operation to functions from different parallelization packages:
local: No parallelization with mapply()
multicore: Multicore execution on a single machine with parallel::mclapply().
socket: Socket cluster on one or multiple machines with parallel::makePSOCKcluster() and parallel::clusterMap().
mpi: Snow MPI cluster on one or multiple machines with parallel::makeCluster() and parallel::clusterMap().
BatchJobs: Parallelization on batch queuing HPC clusters, e.g., Torque, SLURM, etc., with BatchJobs::batchMap().
For BatchJobs mode you need to define a storage directory through the
argument storagedir or the option parallelMap.default.storagedir.