Feb 20, 2015. Because of this, there are a wide variety of MPI implementations out there. One of the most popular implementations, MPICH2, will be used for all of the examples provided through this site. Users are free to use any implementation they wish, but only instructions for installing MPICH2 will be provided.

I am trying to use install openMPI and mpich2 on a multi-node cluster and I am having trouble running on multiple machines in both cases. Using mpich2 I am able to run on an specific host from the head node, but if I try to run something from the compute nodes to a different node I get: HYDU_sock_connect (utils/sock/sock.c:172): unable to connect from 'destination_node' to 'parent_node' (No route to host) [proxy:0:0@destination_node] main (pm/pmiserv/pmip.c:189): unable to connect to server parent_node at port 56411 (check for firewalls!) If I try to use sge to set up a job I get similar errors. On the other hand, if I try to use openMPI to run jobs, I am not able to run in any remote machine, even from the head node. I get: ORTE was unable to reliably start one or more daemons. This usually is caused by: * not finding the required libraries and/or binaries on one or more nodes. Please check your PATH and LD_LIBRARY_PATH settings, or configure OMPI with --enable-orterun-prefix-by-default * lack of authority to execute on one or more specified nodes.

Please verify your allocation and authorities. * the inability to write startup files into /tmp (--tmpdir/orte_tmpdir_base). Please check with your sys admin to determine the correct location to use. * compilation of the orted with dynamic libraries when static are required (e.g., on Cray). Race Driver Grid Recognize Controller Salary.

Please check your configure cmd line and consider using one of the contrib/platform definitions for your system type. * an inability to create a connection back to mpirun due to a lack of common network interfaces and/or no route found between them. Please check network connectivity (including firewalls and network routing requirements). The machines are connected to each other, I can ping, ssh passwordlessly etc from any of them to any other, MPI_LIB and the PATH are well set in all machines. Usually this is caused because you didn't set up a hostfile or pass the list of hosts on the command line. For MPICH, you do this by passing the flag -host on the command line, followed by a list of hosts ( host1, host2, host3,etc.). Mpiexec -host host1,host2,host3 -n 3 You can also put these in a file: host1 host2 host3 Then you pass that file on the command line like so: mpiexec -f -n 3 Similarly, with Open MPI, you would use: mpiexec --host host1,host2,host3 -n 3 and mpiexec --hostfile hostfile -n 3 You can get more information at these links: • MPICH - • Open MPI.

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