On Nov 13, 2005, at 1:34 AM, Yaron Kretchmer wrote:
I have an mpi-based application which contains an STL map. The map is of a non-standard type (i.e my own class). I would like to synchronize the maps between multiple machines , at the end of which I want each machine to have the complete map. This seems to be a pretty standard operation, so I'm wondering if it's been done before. If not, some pointers on how to roll my own sync would be appreciated
If you use straight MPI, you are going to have to write your own datatype information, and probably some packing / unpacking code. MPI doesn't map very well to some of the complex STL datatypes (like std::map), so some translation will be necessary. In terms of actually moving the data, I believe MPI_ALLGATHERV will do what you wish, but it's going to take some setup work to get the data ready for transmission.
I'm not aware of any packages that make using the STL and MPI easier, but it's possible I've missed them.
Brian -- Brian Barrett Graduate Student, Open Systems Lab, Indiana University http://www.osl.iu.edu/~brbarret/
