[ANN] MPI.jl 0.14 changes

Specific Domains Julia at Scale
1

I’ve just tagged MPI.jl 0.14: the major change in this release is that it will now use a BinaryBuilder-provided MPI binary (Microsoft MPI on Windows, MPICH on other platforms).

If you are running on a HPC system you will probably want to use the system-provided binary, see Configuration · MPI.jl for details.

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2

Trying to build MPI.jl against the system MPI via the instructions you linked above, I encounter the error:

[ Info: using system MPI
┌ Info: Using implementation
│   libmpi = "/glade/u/apps/ch/opt/mpt/2.22/lib/libmpi"
└   mpiexec_cmd = `/glade/u/apps/ch/opt/mpt/2.22/bin/mpiexec`
┌ Info: MPI implementation config
└   abi = "MPICH"
ERROR: MethodError: no method matching adjoint(::Nothing)
Closest candidates are:
  adjoint(::Missing) at missing.jl:100
  adjoint(::Number) at number.jl:169
  adjoint(::LinearAlgebra.Adjoint) at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.5/LinearAlgebra/src/adjtrans.jl:164

Any thoughts on what might be happening here? I would really like to evaluate MPI.jl vs more traditional C++/Fortran + MPI on our HPC cluster, but so far I cannot get MPI.jl to build and use the IB network.

3

Is that the full error message? Does it give you a line number?

4

Is think that being difficult to build would be one of the main requirements of an MPI replacement. Otherwise would it even be the same thing?

5

That is the full error message. Is there a way to get more verbosity from the build process?

6

It looks like you have a single apostrophe (') inserted somewhere, which it is interpreting as an adjoint. After what you have above it should print a stacktrace. e.g. if I do:

julia> Pkg.build("MPI")' # incorrect apostrophe
   Building MPI → `~/src/MPI.jl/deps/build.log`
ERROR: MethodError: no method matching adjoint(::Nothing)
Closest candidates are:
  adjoint(::Missing) at missing.jl:100
  adjoint(::Number) at number.jl:169
  adjoint(::LinearAlgebra.Adjoint) at /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.5/LinearAlgebra/src/adjtrans.jl:164
  ...
Stacktrace:
 [1] top-level scope at REPL[4]:1

which tells me the error occurred in the REPL.

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7

Indeed! You are eagle-eyed, and I am a hubled copy/paster. Thanks for spotting that, and I’ll be on my way :wink:

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