debugging GCHP

[kaysuselj]

Your name

kay suselj

Your affiliation

JPL

Please provide a clear and concise description of your question or discussion topic.

I am trying to use the gdb debugger on Pleiades to debug GCHP, specifically to set a breakpoint and halt execution at a specific line in the code. However, I have not been successful so far.

I compile the code using the -DCMAKE_BUILD_TYPE=Debug option (with cmake), but when I set a breakpoint in gdb, the program crashes upon execution. Is there an additional compilation flag or debugging option that I need to enable?

Additionally, I am unable to run GCHP on a single CPU, which would be helpful for debugging. Any suggestions on how to achieve this would be greatly appreciated.

[lizziel]

Hi @kaysuselj, we have not used GCHP with the gdb debugger before. @mathomp4, does GEOS work with gdb? If yes, do you build with certain settings?

[lizziel]

To answer your question about single CPU, it is not possible to run GCHP with fewer than 6 cores. This is because each of the 6 cubed sphere faces must have at least one core.

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[lizziel]

@kaysuselj, were you able to make headway with using a debugger? If not, we can bring this up at the next MAPL meeting.

[mathomp4]

@lizziel I missed my first mention on this. I've never used gdb for debugging MAPL/GEOS mainly because gdb and MPI is usually not that fun.

At NCCS I mainly use Linaro Forge or Totalview, and NAS has Totalview available. I'd recommend that. They are parallel debuggers and handle MPI much better.

[lizziel]

Great, thanks for the recommendations. I will close this issue.