I am using OMPI v.1.5.5 to communicate 200 Processes in a 2-Computers cluster connected though Ethernet, obtaining a very poor performance. I have measured each operation time and I haver realised that the MPI_Gather operation takes about 1 second in each synchronization (only an integer is send in each case). Is this time range normal or I have a synchronization problem?  Is there any way to improve this performance?


Thank you for your help in advance