A cluster future is a future whose value will be resolved asynchronously in a parallel process
ClusterFuture(expr = NULL, envir = parent.frame(), substitute = FALSE,
globals = TRUE, packages = NULL, local = !persistent, gc = FALSE,
persistent = FALSE, workers = NULL, user = NULL, master = NULL,
revtunnel = TRUE, homogeneous = TRUE, ...)An R expression.
The environment in which the evaluation
is done (or inherits from if local is TRUE).
If TRUE, argument expr is
substitute():ed, otherwise not.
(optional) a logical, a character vector,
or a named list for controlling how globals are handled.
For details, see section 'Globals used by future expressions'
in the help for future().
If FALSE, the evaluation environment is cleared from objects prior to the evaluation of the future.
A cluster.
Alternatively, a character vector of host names or a numeric scalar,
for creating a cluster via makeCluster(workers).
(optional) The user name to be used when communicating with another host.
(optional) The hostname or IP address of the master machine running this node.
If TRUE, reverse SSH tunneling is used for the PSOCK cluster nodes to connect back to the master R process. This avoids the hassle of firewalls, port forwarding and having to know the internal / public IP address of the master R session.
If TRUE, all cluster nodes is assumed to use the
same path to Rscript as the main R session. If FALSE, the
it is assumed to be on the PATH for each node.
Additional named elements passed to Future().
If TRUE, session information is collected for each cluster node, otherwise not. This also servers as testing that each node is working properly.
An object of class ClusterFuture.
To evaluate an expression using "cluster future", see function
cluster().