Are you running the same OS version and Open MPI version between the head node
and regular nodes?
On Sep 23, 2011, at 5:27 PM, Vassenkov, Phillip wrote:
> Hey all,
> I’ve been racking my brains over this for several days and was hoping anyone
> could enlighten me. I’ll describe only the relevant parts of the
> network/computer systems. There is one head node and a multitude of regular
> nodes. The regular nodes are all identical to each other. If I run an mpi
> program from one of the regular nodes to any other regular nodes, everything
> works. If I include the head node in the hosts file, I get segfaults which
> I’ll paste below along with sample code. The machines are all networked via
> infiniband and Ethernet. The issue only arises when mpi communication occurs.
> By this I mean, MPi_Init might succeed but the segfault always occurs on
> MPI_Barrier or MPI_send/recv. I found a work around by disabling the openib
> btl and enforcing that communications go over infiniband(if I don’t force
> infiniband, it’ll go over Ethernet). This command works when the head node is
> included in the hosts file:
> mpirun --hostfile hostfile --mca btl ^openib --mca btl_tcp_if_include ib0
> -np 2 ./b.out
>
> Sample Code:
> #include "mpi.h"
> #include <stdio.h>
> int main(int argc, char *argv[])
> {
> int rank, nprocs;
> char* name[20];
> int maxlen = 20;
> MPI_Init(&argc,&argv);
> MPI_Comm_size(MPI_COMM_WORLD,&nprocs);
> MPI_Comm_rank(MPI_COMM_WORLD,&rank);
> MPI_Barrier(MPI_COMM_WORLD);
> gethostname(name,maxlen);
> printf("Hello, world. I am %d of %d and host %s \n", rank, nprocs,name);
> fflush(stdout);
> MPI_Finalize();
> return 0;
>
> }
>
> Segfault:
> [pastec:19917] *** Process received signal ***
> [pastec:19917] Signal: Segmentation fault (11)
> [pastec:19917] Signal code: Address not mapped (1)
> [pastec:19917] Failing at address: 0x8
> [pastec:19917] [ 0] /lib64/libpthread.so.0() [0x34a880eeb0]
> [pastec:19917] [ 1] /usr/lib64/libmthca-rdmav2.so(+0x36aa) [0x7eff6430b6aa]
> [pastec:19917] [ 2]
> /usr/lib64/openmpi/lib/openmpi/mca_btl_openib.so(+0x133c9) [0x7eff66a163c9]
> [pastec:19917] [ 3]
> /usr/lib64/openmpi/lib/openmpi/mca_btl_openib.so(+0x1eb70) [0x7eff66a21b70]
> [pastec:19917] [ 4]
> /usr/lib64/openmpi/lib/openmpi/mca_btl_openib.so(+0x1ec89) [0x7eff66a21c89]
> [pastec:19917] [ 5]
> /usr/lib64/openmpi/lib/openmpi/mca_btl_openib.so(+0x1403d) [0x7eff66a1703d]
> [pastec:19917] [ 6] /usr/lib64/openmpi/lib/openmpi/mca_pml_ob1.so(+0x120e6)
> [0x7eff676670e6]
> [pastec:19917] [ 7] /usr/lib64/openmpi/lib/openmpi/mca_pml_ob1.so(+0x6273)
> [0x7eff6765b273]
> [pastec:19917] [ 8] /usr/lib64/openmpi/lib/openmpi/mca_coll_tuned.so(+0x1b2f)
> [0x7eff65539b2f]
> [pastec:19917] [ 9] /usr/lib64/openmpi/lib/openmpi/mca_coll_tuned.so(+0xa5cf)
> [0x7eff655425cf]
> [pastec:19917] [10] /usr/lib64/openmpi/lib/libmpi.so.0(MPI_Barrier+0x9e)
> [0x3a54c4c94e]
> [pastec:19917] [11] ./b.out(main+0x6e) [0x400a42]
> [pastec:19917] [12] /lib64/libc.so.6(__libc_start_main+0xfd) [0x34a841ee5d]
> [pastec:19917] [13] ./b.out() [0x400919]
> [pastec:19917] *** End of error message ***
> [pastec.gtri.gatech.edu:19913] [[18526,0],0]-[[18526,1],1]
> mca_oob_tcp_msg_recv: readv failed: Connection reset by peer (104)
> --------------------------------------------------------------------------
> mpirun noticed that process rank 1 with PID 19917 on node
> pastec.gtri.gatech.edu exited on signal 11 (Segmentation fault).
> --------------------------------------------------------------------------
>
>
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--
Jeff Squyres
jsquy...@cisco.com
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