10.6. iWARP Support
10.6.1. How are iWARP devices supported in Open MPI?
Open MPI’s support for iWARP devices has changed over time.
In the Open MPI v5.1.x series, iWARP devices are
supported via the OFI (
ofi) MTL via the CM (
Prior versions of Open MPI supported iWARP devies via the
openib BTL. Open MPI v5.1.x no longer includes
Specifically, iWARP support is provides through the
of the OpenFabrics Interfaces library
libfabric. There is
software emulation involved in the MPI support of iWARP devices (and
therefore at least some level of performance degradation), but the
current iWARP vendors have chosen not to provide a higher-performance
iWARP support is not well tested or maintained in Open MPI. The Open MPI community would love to have a maintainer who can develop and provide support for iWARP devices over time.