[petsc-users] Starting in debugger

Barry Smith bsmith at petsc.dev
Sat Apr 16 22:13:46 CDT 2022

   You should be able to use -start_in_debugger -debug_terminal xterm  

   When I added support for Apple Terminal it seems I hardwired it only for lldb. I've attached a patch that will make it also work for gdb so that just -start_in_debugger should open Terminal windows with the gdb debugger for you.

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> On Apr 16, 2022, at 8:17 PM, Sanjay Govindjee <s_g at berkeley.edu> wrote:
> I would like to start up some runs in the debugger and am running into two primary issues.
> (1) seem to not be able to control which debugger is used and
> (2) there are errors in the start up, lastly
> (3) if I do manage to start to job in the debugger (through manual means), then running it is a bit of roulette as to if the job will continue in the debugger.
> I have petsc-3.17 built with GCC compilers and --with-debugger=/usr/local/bin/gdb (using a patch Barry Smith created today).
> [1] When I execute "mpirun -n 2 hellow  -debugger_terminal Terminal"   or  "mpirun -n 2 hellow -start_in_debugger gdb -debugger_terminal Terminal".   I am getting lldb in the debugging windows.
> [2] The second problem I am seeing is that in the window where I have run mpirun, the job exits with an mpirun message as shown.
> $ mpirun -n 2 hellow -start_in_debugger gdb -debugger_terminal Terminal
> --------------------------------------------------------------------------
> mpirun has exited due to process rank 1 with PID 0 on
> node Sanjays-MacBook-Pro2020 exiting improperly. There are three reasons this could occur:
> 1. this process did not call "init" before exiting, but others in
> the job did. This can cause a job to hang indefinitely while it waits
> for all processes to call "init". By rule, if one process calls "init",
> then ALL processes must call "init" prior to termination.
> 2. this process called "init", but exited without calling "finalize".
> By rule, all processes that call "init" MUST call "finalize" prior to
> exiting or it will be considered an "abnormal termination"
> 3. this process called "MPI_Abort" or "orte_abort" and the mca parameter
> orte_create_session_dirs is set to false. In this case, the run-time cannot
> detect that the abort call was an abnormal termination. Hence, the only
> error message you will receive is this one.
> This may have caused other processes in the application to be
> terminated by signals sent by mpirun (as reported here).
> You can avoid this message by specifying -quiet on the mpirun command line.
> -------------------------------------------------------------------------
> [3] If I just do something like "mpirun -n 5 xterm -e /usr/local/bin/gdb hellow"; I get gdb running in xterm which is ok to some extent, though I prefer Terminal.  However, I do run into the problem that the order in which I issue 'run' at the (gdb) prompt dictates if the program will launch or not.  Sometimes I guess the order correctly and the job runs, other times it just hangs.
> -sanjay

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