I have an object which has as a private type a boost::unordered_map, and an iterator, which iterates over the map elements. For a given map element, the value Struct has a member variable, which is an integer storing a value between 0,...,#NUM_PROCESSORS-1. I'd like to 'scatter' the object by creating new instances of this object on all the threads, where a given pair is on processor i, if value has this integer set to be value i. I suppose I could perform a large number of Sends and Receives, i.e. iterate over the complex, and then send a pair to the correct worker node every time I find it, but, this seems bad communication wise? Would there be a way to somehow buffer the sends happen at once? Or is there possibly an even better way of doing this? -rhl