HP-MPI Version 2.2 for Linux Release Note

HP-MPI V2.2 for Linux Release Note

What’s in This Version

Signal Propagation

HP-MPI 2.2 supports the propagation of signals from mpirun to application ranks. The

mpirun executable traps the following signals and propagates them to the ranks:

SIGINT

SIGTERM

SIGABRT

SIGALRM

SIGFPE

SIGHUP

SIGILL

SIGPIPE

SIGQUIT

SIGSEGV

SIGUSR1

SIGUSR2

SIGBUS

SIGPROF

SIGSYS

SIGTRAP

SIGURG

SIGVTALRM

SIGPOLL

SIGCONT

SIGTSTP

If prun/srun is used for launching the application, then mpirun sends the signal to the

responsible launcher and relies on the signal propagation capabilities of the launcher to

ensure that the signal is propagated to the ranks. When using prun, SIGTTIN is also

intercepted by mpirun, but is not propagated.

When using an appfile, HP-MPI propagates these signals to remote HP-MPI daemons (mpid)

and local ranks. Each daemon propagates the signal to the ranks it created. An exception is

the treatment of SIGTSTP. When a daemon receives a SIGTSTP signal, it propagates

SIGSTOP to the ranks it created and then raises SIGSTOP on itself. This allows all processes

related to an HP-MPI execution to be suspended and resumed using SIGTSTP and SIGCONT.

The HP-MPI library also changes the default signal handling properties of the application in a

few specific cases. When using the -ha option to mpirun, SIGPIPE is ignored. When using

MPI_FLAGS=U, a signal handler is established for SIGUSR1. When using MPI_FLAGS=sa, a

signal handler is established for SIGALRM. When using MPI_FLAGS=sp, a signal handler is

established for SIGPROF.