A wrapper around mpiexec, gdbserver, and gdb that makes debugging MPI programs easier with a moderate number of processes.
This wrapper defines several GDB extension commands that should help make things easier too.
mpic continue, but all processes
mpict continue this thread, and switch to the next one that is stopped if there is one
mpip print on all or a subset of threads using -t $tid
mpib break on all or a subset of threads using -t $tid
You also should probably know about the following buildin commands
thread apply all applies a command to all threads
continue & in GDB any command ending in & runs a command "in the background" allowing the user to continue to interact with GDB. In this case continue this thread in the background
info threads get a list of threads and their status
interupt if the current thread is running stop it.
thread $tid switch to thread id
Dependencies:
gdb 12.1 or later with gdbserver which is sometimes packaged separately and python support which may be disabled if compiled from sourcempiexecEarlier versions may work, but are not tested
For HPC systems with meaningful scale, we should probably integrate with PMIx, but we currently do onot.