Thanks, it worked out. On 08/16/2017 04:05 PM, Gilles Gouaillardet wrote:
My bad, i forgot btl/tcp is using all the interfaces by default (eth0 *and* ib0)is eth0 available on all your nodes or just the node running mpirun ? you can try to use a subnet instead of an interface name mpirun --mca btl_tcp_if_include 172.24.44.0/23 ... if you are still facing some issues, you can mpirun ... --mca btl_base_verbose 100 ... in order to collect (lot of) logs Cheers, Gilles On Wed, Aug 16, 2017 at 10:54 PM, Maksym Planeta <mplan...@os.inf.tu-dresden.de> wrote:Dear Gilles, thank you for quick response. pml/cm doesn't work at all When I use "--mca pml ob1" I still see traffic in /usr/sbin/perfquery, but the program starts running a lot slower. E. g. ib.C.64 benchmarks runs 33 seconds in contrast to less than 1. I also see many if following warning messages when I use PML ob1: [<hostname>:25220] mca_base_component_repository_open: unable to open mca_coll_hcoll: libmxm.so.2: cannot open shared object file: No such file or directory (ignored) But at least I see traffic on ib0 interface. So I basically achieved the goal from the original mail. Nevertheless I wanted to try avoid IB completely, so I added "--mca btl_tcp_if_exclude ib0". But no program cannot run and fails with these kinds of messages: [<hostname>][[42657,1],23][btl_tcp_endpoint.c:649:mca_btl_tcp_endpoint_recv_connect_ack] received unexpected process identifier [[42657,1],1] I see the same message when I also use this flag "--mca btl_tcp_if_include lo,ib0" Here is full command: $ mpirun --mca pml ob1 --mca btl self,tcp --mca btl_tcp_if_include lo,ib0 -np 64 bin/is.C.64 I also tried to use "--mca btl_tcp_if_include lo,eth0", but MPI started complaining with this message: [<hostname>][[40797,1],58][btl_tcp_component.c:706:mca_btl_tcp_component_create_instances] invalid interface "eth0" I do have this interface: $ ip addr show eth0 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000 link/ether 08:00:38:3c:4e:65 brd ff:ff:ff:ff:ff:ff inet 172.24.44.190/23 brd 172.24.45.255 scope global eth0 inet6 fe80::a00:38ff:fe3c:4e65/64 scope link valid_lft forever preferred_lft forever Can I tell somehow MPI to use eth0, and not use ib0? On 08/16/2017 02:34 PM, Gilles Gouaillardet wrote:Hi, you can try mpirun --mca pml ob1 --mca btl tcp,self ... pml/cm has a higher priority than pml/ob1, so if you have a mtl that fits your network (such as mtl/mxm), then pml/ob1 will be ignored, and the list of allowed/excluded btl become insignificant. Cheers, Gilles On Wed, Aug 16, 2017 at 8:57 PM, Maksym Planeta <mplan...@os.inf.tu-dresden.de> wrote:Hello, I work with an Infiniband cluster, but I want to force OpenMPI to use specific network interface. I tried to do this for example using mpirun as follows: mpirun --map-by node --mca btl self,tcp -np 16 bin/is.C.16 But counters returned by /usr/sbin/perfquery still keep showing that transmission happens over ibverbs. There is an iboib module on a machine, but counters there (ip -s link) indicate that the ib0 interface is not used. Could you help me to figure out how to properly tell OpenMPI not to use ibverbs? I tried with Open MPI 2.1.0 and 1.10.2, but saw no difference in behavior. -- Regards, Maksym Planeta _______________________________________________ users mailing list users@lists.open-mpi.org https://lists.open-mpi.org/mailman/listinfo/users_______________________________________________ users mailing list users@lists.open-mpi.org https://lists.open-mpi.org/mailman/listinfo/users-- Regards, Maksym Planeta _______________________________________________ users mailing list users@lists.open-mpi.org https://lists.open-mpi.org/mailman/listinfo/users_______________________________________________ users mailing list users@lists.open-mpi.org https://lists.open-mpi.org/mailman/listinfo/users
-- Regards, Maksym Planeta
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