MPICH - enable debugging prints from `MPIU_DBG_PRINTF()`

StackOverflow https://stackoverflow.com/questions/23258127

  •  08-07-2023
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Question

What is right order of configuring and running MPICH2 or MPICH-3 to enable debugging prints, embedded to code with MPIU_DBG_PRINTF(). I already used --enable-g=dbg,mem,log configure option, and set environment variable MPICH_DBG_OUTPUT to stdout but still have no debug prints from the examples/cpi runs.

Was it helpful?

Solution

you might need to set a few extra environment variables:

  • MPICH_DBG_LEVEL to VERBOSE
  • MPICH_DBG_CLASS to ALL

For example:

mpiexec -n 2 -env MPICH_DBG_OUTPUT VERBOSE \
    -env MPICH_DBG_CLASS ALL \
    -env MPICH_DBG_FILENAME "dbg-%w-%d.log" ./examples/cpi

The wiki has some more information about the other things you can do with the MPICH debugging facility:

https://wiki.mpich.org/mpich/index.php/Debug_Event_Logging

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