Hi, UCX is on the way into RH distro and will be available and ON by default (auto-detectable by OMPI build process) automatically in the near future.
Meanwhile, user can enable UCX by two methods: 1. Download & Install UCX from openucx.org and Build openmpi with it. 2. Download HPC-X from Mellanox site (openmpi pre-compiled and packaged with UCX) for distro of interest (User can re-compile the package with site default as well) Also, for users using the latest MLNX_OFED, UCX is already part of it. --Yossi -----Original Message----- From: devel <devel-boun...@lists.open-mpi.org> On Behalf Of Jeff Squyres (jsquyres) via devel Sent: Tuesday, September 18, 2018 11:50 PM To: Open MPI Developers List <firstname.lastname@example.org> Cc: Jeff Squyres (jsquyres) <jsquy...@cisco.com> Subject: Re: [OMPI devel] Announcing Open MPI v4.0.0rc1 On Sep 18, 2018, at 3:46 PM, Thananon Patinyasakdikul <tpati...@vols.utk.edu> wrote: > > I tested on our cluster (UTK). I will give a thumb up but I have some > comments. > > What I understand with 4.0. > - openib btl is disabled by default (can be turned on by mca) It is disabled by default *for InfiniBand*. It is still enabled by default for RoCE and iWARP. > - pml ucx will be the default for infiniband hardware. > - btl uct is for one-sided but can also be used for two sided as well (needs > explicit mca). > > My question is, what if the user does not have UCX installed (but they have > infiniband hardware). The user will not have fast transport for their > hardware. As of my testing, this release will fall back to btl/tcp if I dont > specify the mca to use uct or force openib. Will this be a problem? This is a question for Mellanox. -- Jeff Squyres jsquy...@cisco.com _______________________________________________ devel mailing list email@example.com https://emea01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.open-mpi.org%2Fmailman%2Flistinfo%2Fdevel&data=02%7C01%7Cyosefe%40mellanox.com%7C97405b61e3e34a4f62b908d61da87297%7Ca652971c7d2e4d9ba6a4d149256f461b%7C0%7C0%7C636729006666150887&sdata=%2B%2BDgDgq0hJrzkVNw3U62wSvJZfpzwa0%2B3usBBsYtFc8%3D&reserved=0 _______________________________________________ devel mailing list firstname.lastname@example.org https://lists.open-mpi.org/mailman/listinfo/devel