HP-UX Reference (11i v2 07/12) - 7 Device (Special) Files, 9 General Information, Index (vol 10)

gang_sched(7) gang_sched(7)

• Gang scheduling is completely shut down when Process Resource Manager (PRM) is enabled.

• If a gang-scheduled process is selected to be swapped out, the process will not be gang-scheduled

when it is swapped back in.

• Realtime processes are not gang-scheduled.

• Gang scheduling is only supported for processes with timeshare scheduling policies.

• When a gang-scheduled process contains the maximum number of threads (or the maximum

number of processes, for MPI applications), threads or processes created after this point are not

scheduled as part of the gang. For details see the BEHAVIOR section of this man page.

• Multiprocess applications that do not use MPI are not supported by the gang scheduler.

• Gang scheduling is not supported for

PTHREAD_SCOPE_PROCESS

threads. From release 11i

Version 1.6 of HP-UX, the default scheduling contention scope for threads is

PTHREAD_SCOPE_PROCESS

. If any PTHREAD_SCOPE_PROCESS

threads are created by an

application, the initial thread will be treated as a

PTHREAD_SCOPE_PROCESS

FILES

The following are libraries used in providing gang scheduling:

/usr/lib/libpthread.1

The pthread library.

/opt/mpi The directory containing MPI libraries and MPI software. HP MPI is an optional product.