Parallel Thread Creation

There are several mechanisms to create a parallel processing stream:
- Library call:
- compiler level (compiler directives)
- automatic parallelization (-apo)
- At low level all shared memory parallelization pass from sproc call to create threads of control with global address space

sproc() (Shared Memory Fork)

m_fork() (simpler sproc)

pthread_create (Posix threads)

start_pes (shmem init routine)

Fork() UNIX

MPI_init() MPI start up

Shared address space

Disjoint address space

C$doacross (SGI old syntax)

c$par parallel (ANSI X3H5 spec)

!$omp parallel (OpenMP specs)

#pragma omp parallel

There are several mechanisms to create a parallel processing stream: