Abstract
The OpenSHMEM Library Specification has evolved considerably since version 1.0. Recently, non-blocking implicit Remote Memory Access (RMA) operations were introduced in OpenSHMEM 1.3. These provide a way to achieve better overlap between communication and computation. However, the implicit non-blocking operations do not provide a separate handle to track and complete the individual RMA operations. They are guaranteed to be completed after either a shmem_quiet(), shmem_barrier() or a shmem_barrier_all() is called. These are global completion and synchronization operations. Though this semantic is expected to achieve a higher message rate for the applications, the drawback is that it does not allow fine-grained control over the completion of RMA operations.
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