mpiprofile viewer crashes unexpectedly

The following minimal code

parpool
spmd
    mpiprofile on
    mpiprofile viewer
end
disp('there is a db point set at this line')

displays the following :

Lab 1:

Sending pmode lab2client to the MATLAB client for asynchronous evaluation. "

with this error message coming next :

Undefined function or variable 'MPI_PROF_VECTOR'.

Any clue ?

[Alexandre Kazantsev]

The issue disappears when there is no debug point at the last line of the script

Answer 1

[Edric Ellis]

I suspect the debug breakpoint is interfering with the data transfer from the spmd block back to the client.

I suppose the only workaround is: don't put a breakpoint there!

Starting in R2020a, you can invoke mpiprofile directly from the client, so you can do this instead:

parpool
mpiprofile on
spmd
    % do stuff
end
mpiprofile viewer

I believe this approach should not be affected by the presence of breakpoints.

[Alexandre Kazantsev]

Thanks, clear enough !