Woo hoo! I love getting emails like this. We actually spend quite a bit of time in the design and implementation of the configure/build system so that it will "just work" in a wide variety of situations.
Thanks! On Jul 17, 2020, at 5:43 PM, John Duffy via users <users@lists.open-mpi.org<mailto:users@lists.open-mpi.org>> wrote: Hi Lana I’m a Open MPI newbie too, but I managed to build Open MPI 4.0.4 quite easily on Ubuntu 20.04 just following the instructions in README/INSTALL in the top level source directory, namely: mkdir build cd build ../configure CFLAGS=“-O3” # My CFLAGS make all sudo make all sudo make install It just worked. My small cluster happily runs Open MPI over TCP/1GB Ethernet. The make install step installed everything into /usr/local. I did forget to ldconfig initially, which confused me. Other than that it just worked. John -- Jeff Squyres jsquy...@cisco.com<mailto:jsquy...@cisco.com>
