On Mon, 26 Oct 2009, Sandeep Gupta wrote:
Hi All, I have spent significant effort on parallel bfs. Currently its almost working. I would really appreciate some help to get it running correctly. I have attached the code (self contained and requires no input file). I think I have followed all the guidelines regarding distributed property maps mentioned in the docs ( http://www.osl.iu.edu/research/pbgl/documentation/graph/breadth_first_search... ). I am out of ideas of where things can could have gone wrong.
The graph is distributed by source vertex across all processors, and so you need to add them on every processor (or at least on the processor that owns them, which is probably not processor 0). Thus, your graph is missing whichever edges would be on processor 1, leading to incorrect results. Try adding all of the edges on all processors and see if this fixes your problem. -- Jeremiah Willcock