I have built MPICH 3.3.1 on Ubuntu 18.04 with the gcc-7 compiler suite. (Build script is provided: build_mpich.) I have built with both --with-device=ch3:nemesis and --with-device=ch3:nemesis:ofi with the same outcome in the make test. A dozen of the tests fail with timeouts. I ran the test on an 8 processor Thinkstation but what would be beneficial is some sort of sense of what the test results should be. I've browsed the test results that you've posted but these appear to be summaries that conclude All Tests Passed, without individual timings for each test. In any case, I would appreciate any guidance that you might be able to provide. I have provided the config files and the summary.junit.xml file. (On my machine the summary.xml file just reports that there is an error on line 9562.) The result of mpiexec -info is: ~/build/mpich-3.3.1/src/pm/hydra % ./mpiexec.hydra -info HYDRA build details: Version: 3.3.1 Release Date: Wed Jun 5 14:57:33 CDT 2019 CC: gcc CXX: g++ F77: gfortran F90: gfortran Configure options: '--disable-option-checking' '--prefix=/home/share/mpich/mpich-3.3.1' '--with-devce=ch3:nemesis' '--cache-file=/dev/null' '--srcdir=.' 'CC=gcc' 'CFLAGS= -O2' 'LDFLAGS=' 'LIBS=' 'CPPFLAGS= -I/home/mark/buildmpich-3.3.1/src/mpl/include -I/home/mark/build/mpich-3.3.1/src/mpl/include -I/home/mark/build/mpich-3.3.1/src/openpa/src -I/hme/mark/build/mpich-3.3.1/src/openpa/src -D_REENTRANT -I/home/mark/build/mpich-3.3.1/src/mpi/romio/include' 'MPLLIBNAME=mpl' Process Manager: pmi Launchers available: ssh rsh fork slurm ll lsf sge manual persist Topology libraries available: hwloc Resource management kernels available: user slurm ll lsf sge pbs cobalt Checkpointing libraries available: Demux engines available: poll select --------------------------------------------------------- Thanks for your help, Mark Mark A Cunningham, PhD Senior Scientist Applied Research in Acoustics LLC Culpeper VA 22701