I’m afraid we don’t currently support that use-case. We forward signals sent by
the user to mpiexec (i.e., the user “hits” mpiexec with a signal), but we don’t
do anything to support an application proc attempting to raise a signal and
asking it to be propagated.
If you are using OMPI master, or the soon-to-be-released v3.0, then you might
be able to do what you seek using the PMIx event notification system.
> On Jul 25, 2017, at 10:15 AM, Marc Cooper <marccooper2...@gmail.com> wrote:
>
> Hi all,
>
> I'm working to understand signal handling in OpenMPI. I read that "Open MPI
> will forward SIGUSR1 and SIGUSR2 from mpiexec to the other processes". My
> question is that is this feature enabled by default installation.
>
> The scenario is that one MPI process raises a SIGUSR1, which has to be
> detected by 'orted' which is then forwarded to other processes.
>
> In my test code, I define a custom signal handler for SIGUSR1 and register
> this signal handler accordingly. I send a signal by using kill() or raise().
> I assume that ORTE daemon will receive this signal and has to forward this
> signal to the remaining processes.
>
> // test.c
>
> void handle_signal(int signal){
> if(SIGNAL==SIGUSR1)
> printf("received SIGUSR1 signal \n");
> }
> int main(){
> MPI_Init(NULL, NULL);
>
> int my_rank;
> MPI_Comm_rank(MPI_COMM_WORLD, &my_rank);
>
> signal(SIGUSR1, handle_signal);
>
> if(my_rank == 1) // process with rank 1 raises SIGUSR1
> kill(getpid(), SIGUSR1);
>
> MPI_Finalize();
> }
>
> If I run this as
> mpirun -np 3 ./test
>
> I would expect to have the statement printed twice from the other two
> processes. But when I run this code, it only prints once, and that too from
> ORTE HNP, unlike the application processes. Do I need to call any other API
> on orted explicitly pass this signal, so that the application processes
> receive the SIGUSR1.
>
> -
> Marc
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