broadcast, collect.

Every PE has some of its memory declared as "symmetric" segments (or shared memory area), and other memory is private. Only "shared" memory can be accessed in one-sided operation from remote PEs. Programmers can use static-memory constructs or shmem_malloc/shmem_free routines to create objects with symmetric addresses that span the PEs.

Typical SHMEM functions

* -- start all processing elements (PE)
* -- ask SHMEM to return the PE identifier of current thread
* -- wait until all PEs

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