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 HP XC System Software : XC Version 3.1 Release Notes > Chapter 9 Programming and User Environment

Required HP-MPI Option on Systems With a Mix of InfiniBand PCI-X and PCI Express
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To run MPI jobs on a set of nodes that have a mix of PCI-X and PCI Express InfiniBand boards, you must include the following option with the HP-MPI mpirun command: 

-e MPI_IB_MTU=1024


Chapter 9 Programming and User Environment
  		 


Chapter 10 Cluster Platform 3000  
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