Folks, i was able to reproduce this behaviour.
here is what the openib (e.g. infiniband) btl does : - if running on Linux, and there is no /sys/class/infiniband, then the btl disqualifies itself (see ompi_common_verbs_check_basics()( - if the btl did not previously disqualified itself, and there is no infiniband port available, then a warning message is issued (we consider there is likely something wrong) i am able to reproduce this scenario on a VM with no infiniband hardware by loading the mlx4_core kernel module. can you confirm you are running into this very same scenario ? is the mlx4_core.ko or similar module loaded ? if yes, is there any reason for it to be loaded ? is the __linux__ macro defined on debian ? does the /sys/class/infiniband directory exists ? is this directory empty ? from an OpenMPI point of view, it could be possible to disqualify the openib btl with no warning message if /sys/class/infiniband is empty, would that be helpful ? Cheers, Gilles
