Conceptually, how is it possible to call an MPI-parallelized code in C from R? My experience with MPI so far indicates that one has to launch an MPI-enabled binary using a command like mpiexec -n <number of processes> <name of binary> In other words, I'm not sure how to create an MPI 'library' and then call it from a single-threaded application. In this sense, my question is perhaps not strictly a R question but an MPI question. (Using a system call forces one to use disk as intermediary between R and the MPI binary to pass data between the two.) I am also aware of packages such as Rmpi, but at this stage I want to be able to understand the low-level capabilities rather than relying on an abstraction layer. Thank you, Alireza -- View this message in context: http://r.789695.n4.nabble.com/How-to-call-an-MPI-enabled-program-from-R-tp3834332p3834332.html Sent from the R devel mailing list archive at Nabble.com.