All,

I'm trying to do some tests on a Quobyte system and we've seen confusing file write timings with Intel MPI and Open MPI. So, a bit of googling seeing if some MPI stack has a mention of Quobyte turns up:

https://www.quobyte.com/blog/quobyte-mpi-io-support-with-kernel-bypass-now-available/

and, yep, quobyte seems to be in MPICH! I grabbed MPICH 4.3.0 and built it (with one bug fix[1]) and well, it seems to run Hello World.

So, following that Quobyte page, I get to Step 10 and tried the romio tests and...I am apparently dumb. I went to my

  build/src/mpi/romio/test

directory and I see 'runtests' there, but:

  > ./runtests

  make: *** No rule to make target 'default'.  Stop.

I also tried with -fname and:

> ./runtests -fname=quobyte:test_mpi_file

./runtests: line 90: [quobyte:test_mpi_file: command not found

make: *** No rule to make target 'default'.  Stop.

> ./runtests -fname=quobyte:/home/mathomp4/MPI/src/mpich-4.3.0/build-ifort-2021.13/src/mpi/romio/test/test_mpi_file

./runtests: line 90: [quobyte:/home/mathomp4/MPI/src/mpich-4.3.0/build-ifort-2021.13/src/mpi/romio/test/test_mpi_file: No such file or directory

make: *** No rule to make target 'default'.  Stop.

Yeah. I'm stumped. I'm guessing I've missed some simple step along the way.

NOTE: I have no idea even how to use romio really, but I was hoping the tests could, well, help me figure that out.

Thanks for any help,

Matt

[1] See https://github.com/pmodels/mpich/issues/7452