On February 15, 2016 at 5:58:48 PM, Jeff Hammond ([email protected]) wrote:

Well, this program will not compile, since MPI_Comm_dup_with_info takes three arguments. Furthermore, the info is NOT duplicated and instead the second argument is the info the user provides for the new communicator.

Yeah, that was a typo -- it should be MPI_Comm_dup (i.e., use the info that was set on the communicator).  Here's the correct version: ----- MPI_Info_set(myinfo, "use_shared_memory", "yes"); MPI_Comm_set_info(comm, myinfo); MPI_Comm_get_info(comm, myinfo_returned); // Assume here that there was not enough shared memory available to use shared-memory for // communication on this comm, so MPI_Info_get() tells us that use_shared_memory is "no". // ...time passes, and now assume there is more shared-memory available MPI_Comm_dup(comm, &newcom); MPI_comm_get_info(newcom, myinfo_returned); ----- -- Jeff Squyres [email protected] For corporate legal information go to: http://www.cisco.com/web/about/doing_business/legal/cri/