| Task Info (Flyspray) | | |--------------------------|-------------------------------------------------------------------------------------| | <small>Opened By</small> | <small>[Francisco J. Vazquez (Fran)](https://bugs.archlinux.org/user/26248)</small> | | <small>Task ID</small> | <small>[79670](https://bugs.archlinux.org/task/79670)</small> | | <small>Type</small> | <small>Bug Report</small> | | <small>Project</small> | <small>Arch Linux</small> | | <small>Category</small> | <small>Packages: Extra</small> | | <small>Version</small> | <small>None</small> | | <small>OS</small> | <small>x86_64</small> | | <small>Opened</small> | <small>2023-09-12 15:52:36 UTC</small> | | <small>Status</small> | <small>Assigned</small> | | <small>Assignee</small> | <small>[David Runge (dvzrv)](https://bugs.archlinux.org/user/9560)</small> | | <small>Assignee</small> | <small>[Levente Polyak (anthraxx)](https://bugs.archlinux.org/user/17958)</small> | | <small>Assignee</small> | <small>[Christian Heusel (gromit)](https://bugs.archlinux.org/user/30483)</small> | ### Details I have two fully updated arch systems host1 and host2, both with openmpi 4.1.5-5 installed. Running: $ mpirun -v -n 2 --hostfile hosts.txt bash -c 'echo $HOSTNAME' in host1, where hosts.txt is: host1 slots=1 host2 slots=1 fails with: -------------------------------------------------------------------------- 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). 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). -------------------------------------------------------------------------- Downgrading the *remote* host to openmpi 4.1.5-4 solves the problem: $ mpirun -v -n 2 --hostfile hosts.txt bash -c 'echo $HOSTNAME' host2 host1 The local version of openmpi does not seem to influence the result. The same thing happens with -n 1, even though the program is launched locally.