Hi, You can use the btl_tcp_disable_family and oob_tcp_disable_family MCA parameters to disable the use of a specific IP family addresses. Set both parameters to 6 to disable IPv6 or set them both to 4 in order to disable IPv4.
Kind regards, Hristo > -----Original Message----- > From: users-boun...@open-mpi.org [mailto:users-boun...@open-mpi.org] > On Behalf Of Antony Cleave > Sent: Thursday, March 21, 2013 1:09 PM > To: us...@open-mpi.org > Subject: [OMPI users] Possible bug in OpenMPI 1.6.3 in selecting v4 or v6 > network addresses on the same adaptor > > Hi > > I've been fighting trying to run comparitive test of IMB using OpenMPI > 1.6.3 on the same node using an Intel Truescale card and the onboard > Ethernet. > > Turns out that all of the problems were due to the IP v6 addresses being > firewalled on the nodes but OpenMPI was trying to use the IPv6 addresses > of the nodes in spite of me explicitly specifying the IP v4 address as in the > following example: > > mpirun --mca btl ^openib --mca mtl ^psm --mca btl_tcp_if_include eth0 -- > mca btl_tcp_if_include 10.141.0.0/16 --mca btl_base_verbose 30 -np 2 -- > hostfile ./hostfile ./IMB-MPI1 pingpong . . . > [node041:16301] select: initializing btl component tcp [node041:16301] btl: > tcp: Searching for include address+prefix: > 10.141.0.0 / 16 > [node041:16301] btl: tcp: Found match: 10.141.0.41 (eth0) [node041:16301] > select: init of component tcp returned success [node041:16301] btl: tcp: > attempting to connect() to address > 2002:bccb:3a13:141:225:90ff:fe58:5986 on port 4 > > When I tried to exclude the IP v6 addresses as well I'm told that --mca > btl_tcp_if_include and --mca btl_tcp_if_exclude are mutually exclusive so I > assume that this is not the expected behaviour. > > I also cannot find a command line switch in the documentation to disable > IPv6 or IPv4. > > To fix this I first manually deleted the ipv6 addresses on the two nodes and it > worked as expected. I then reenabled them unfirewalled the v6 addresses > and it also worked correctly using those (in spite of specifying the IPv4 > address explicitly). > > This is all running on Scientific Linux release 6.3 > > I haven't tried to reproduce this on a node without a TrueScale card in but I > do not seem why this would make any difference to the tcp component. > > Thanks > > Antony > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users -- Hristo Iliev, PhD - High Performance Computing Team RWTH Aachen University, Center for Computing and Communication Rechen- und Kommunikationszentrum der RWTH Aachen Seffenter Weg 23, D 52074 Aachen (Germany)
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