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    <p>A way I've kept track of progress on nodes during long operations is to create a progress bar using <code>tkProgressBar</code> from the <code>tcltk</code> package. It's not quite what you asked for, but it should let you see something from the nodes. At least it does when the cluster is a socket cluster running on the local host (which is a Windows machine). The potential problem is that the progress bar either remains and clutters your monitor or it gets <code>close</code>d and the printed info is gone. For me, that wasn't a problem, though, since I just wanted to know what the current status was.</p> <pre><code>library(parallel) library(doSNOW) cl&lt;-makeCluster(detectCores(),type="SOCK") registerDoSNOW(cl) </code></pre> <p>Using your code,</p> <pre><code>foreach(ntree=rep(25,2),.combine=combine,.packages=c('randomForest','tcltk'), .inorder=FALSE) %dopar% { mypb &lt;- tkProgressBar(title = "R progress bar", label = "", min = 0, max = 1, initial = 0, width = 300) setTkProgressBar(mypb, 1, title = "RANDOM FOREST", label = NULL) ans &lt;- randomForest(classForm,data=data,na.action=na.action,do.trace=do.trace,ntree=ntree,mtry=mtry) close(mypb) ans } </code></pre> <p><strong>Here's a more general use example:</strong></p> <pre><code>jSeq &lt;- seq_len(30) foreach(i = seq_len(2), .packages = c('tcltk', 'foreach')) %dopar% { mypb &lt;- tkProgressBar(title = "R progress bar", label = "", min = 0, max = max(jSeq), initial = 0, width = 300) foreach(j = jSeq) %do% { Sys.sleep(.1) setTkProgressBar(mypb, j, title = "RANDOM FOREST", label = NULL) } NULL } </code></pre>
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