There are a few points I found unclear or unmentioned in the snow documentation (mostly I looked at the cluster.html web page). I thought I'd mention them here.
What is the start up environment for the children? -------------------------------------------------- My best guess at the answer is in parentheses Do they inherit shell variables? (no) Do they inherit variables set in R or other aspects of the R environment? (no) What directory does it start in? (the directory you are running in) What user are you? (same as original) I realize some of these answers might depend on the parallelization layer you are using, or whether you select the homogenous option. There are also some entertaining pathological cases; for example, lam/mpi lets you start some of the children as another user. Number of nodes or number of children? -------------------------------------- I thought all the counts of nodes (e.g., in makeCluster(5)) were of the total nodes in the cluster, i.e., children + 1. However, I did a makeCluster(2) and I got 2 additional R processes running. Have I misunderstood the semantics, or is it essentially an implementation detail that the master node starts a new R process? Options ------- Is the full set of cluster options documented anywhere? -- Ross Boylan wk: (415) 502-4031 530 Parnassus Avenue (Library) rm 115-4 [EMAIL PROTECTED] Dept of Epidemiology and Biostatistics fax: (415) 476-9856 University of California, San Francisco San Francisco, CA 94143-0840 hm: (415) 550-1062 ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
