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Subject: [OMPI users] Very slow MPI_GATHER
From: Pinero, Pedro_jose (Pedro_jose.Pinero_at_[hidden])
Date: 2012-02-29 11:01:36



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