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