On 04/03/2011 02:53 PM, Mandar Gurav wrote: > Now, I want to access the information of every process at root(rank - 0). > 1. Node name / IP address > 2. PID of the process. Can't you read them separately on each process and MPI_Gather them at the root? -- Pavan -- Pavan Balaji http://www.mcs.anl.gov/~balaji