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debuggingemacsfortrangdbmpi
diex
diex

Reputation: 21

Using GDB to debug an MPI program in Fortran (on MAC)

I was using the answer from this post (Using GDB to debug an MPI program in Fortran) to debug an MPI Fortran program on my Mac. I tried to implement the answer that was given by Vladimir F. However, after: 

gdb -pid <the_pid_you_got_from_getpid>

The debugger opened and I got the following message:

warning: unhandled dyld version (15)

0x00007fffb6f2ef46 in ?? ()

And when I tried:

(gdb) info locals

I got "No symbol table info available". As a result I can not attach gdb to the running process.

I am working with MacOS 10.12 (Sierra), gdb 8.0, and compiling with mpif90 configured for ifort (version: 17.0.4).

Any ideas about what could be the cause of my problem?

Upvotes: 2

Views: 1989

Answers (1)

Oo.oO
Oo.oO

Reputation: 13405

If you are not that committed to gdb (which is, in fact, deprecated at mac os as part of default toolchain), you can play with lldb.

So, for a code like this:

program main

  use mpi

  integer error
  integer id
  integer p
  call MPI_Init ( error )
  call MPI_Comm_size ( MPI_COMM_WORLD, p, error )
  call MPI_Comm_rank ( MPI_COMM_WORLD, id, error )
  write (*,*) 'Hello: ', id, '/', p
  call MPI_Finalize ( error )
  stop
end

and compilation like this

mpif90 -g -o fort ./fort.f90

you should be able to start lldb following way

mpirun -np 2 xterm -e lldb ./fort

which will give you two, separate xterms with lldb running

enter image description here

Note that for xterm you need to have XQuartz installed (https://www.xquartz.org)

Update:

I am not sure whether this will help with this particular issue, but you can always try to compile GDB from the sources. Take a look here for description how to do it: Building GDB on macOS Sierra

Then, you can run mpirun with xterm and gdb and your MPI code like this

mpirun -np 2 xterm -e gdb ./mpi_sample

Now, you can see that there is still warning with dyld version, but code seems to work fine.

enter image description here

But still, question is, what will happen with ifort compiled code :( In my case I am using:

mpifort --version
GNU Fortran (GCC) 6.3.0
Copyright (C) 2016 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

gdb --version
GNU gdb (GDB) 8.0
Copyright (C) 2017 Free Software Foundation, Inc.

mpirun --version
mpirun (Open MPI) 2.0.2

Upvotes: 3

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