HP-MPI Version 2.2 for HP-UX Release Note

HP-MPI V2.2 for HP-UX 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

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=sa, a signal handler is established for SIGALRM and used for message

propagation. When using MPI_FLAGS=sp, a signal handler is established for SIGPROF and

used for message propagation.

In general, HP-MPI relies on applications terminating when they are sent SIGTERM.

Applications which intercept SIGTERM may not terminate properly.