Terminate one or more cluster nodes using process signaling
killNode(x, signal = tools::SIGTERM, ...)
cluster or cluster node to terminate.
An integer that specifies the signal level to be sent
to the parallel R process.
Note that the preferred way to terminate a cluster is via
parallel::stopCluster(), because it terminates the cluster nodes
by kindly asking each of them to nicely shut themselves down.
killNode() is a much more sever approach. It abruptly
terminates the underlying R process, possibly without giving the
parallel worker a chance to terminate gracefully. For example,
it might get terminated in the middle of writing to file.
tools::pskill() is used to send the signal to the R process hosting
the parallel worker.
TRUE if the signal was successfully applied, FALSE if not, and NA if signaling is not supported on the specific cluster or node. Warning: With R (< 3.5.0), NA is always returned. This is due to a bug in R (< 3.5.0), where the signaling result cannot be trusted.
This function works only with cluster nodes of class
which were created by
makeClusterPSOCK(). It does not work when
parallel::makeCluster() and friends.
Currently, it's only possible to send signals to parallel workers, that
is, cluster nodes, that run on the local machine.
If attempted to use
killNode() on a remote parallel workers,
is returned and an informative warning is produced.
isNodeAlive() to check whether one or mode cluster nodes are alive.
cl <- makeClusterPSOCK(2) print(isNodeAlive(cl)) ##  TRUE TRUE res <- killNode(cl) print(res) ## It might take a moment before the background ## workers are shutdown after having been signaled Sys.sleep(1.0) print(isNodeAlive(cl)) ##  FALSE FALSE
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