MPICH - enable debugging prints from `MPIU_DBG_PRINTF()` -

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what right order of configuring , running mpich2 or mpich-3 enable debugging prints, embedded code mpiu_dbg_printf(). used --enable-g=dbg,mem,log configure option, , set environment variable mpich_dbg_output stdout still have no debug prints examples/cpi runs.

you might need set few environment variables:

  • mpich_dbg_level verbose
  • mpich_dbg_class all

for example:

mpiexec -n 2 -env mpich_dbg_output verbose \     -env mpich_dbg_class \     -env mpich_dbg_filename "dbg-%w-%d.log" ./examples/cpi

the wiki has more information other things can mpich debugging facility:

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


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