The OpenSHMEM community would like to announce a new effort to standardize SHMEM, a communications library that uses one-sided communication and utilizes a partitioned global address space.OpenSHMEM is an effort to bring together a variety of SHMEM and SHMEM-like implementations into an open standard using a community-driven model. By creating an open-source specification and reference implementation of OpenSHMEM, there will be a wider availability of a PGAS library model on current and future architectures. In addition, the availability of an OpenSHMEM model will enable the development of performance and validation tools.We propose an OpenSHMEM specification to help tie together a number of divergent implementations of SHMEM that are currently available.To support an existing and growing user community, we will develop the OpenSHMEM web presence, including a community wiki and training material, and face-to-face interaction, including workshops and conference participation.

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The OpenSHMEM library provides a set of compile-time constants that may be used to specify options to API routines, provide implementation-specific parameters, or return information about the implementation. All constants that start with _SHMEM_* are deprecated, but provided for backwards compatibility. Constant Description C/C++: SHMEM_THREAD_SINGLE The OpenSHMEM thread support level which specifies that the program must not be multithreaded. See Section 9.2 for more detail about its use.

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Ookami [3] is a computer technology testbed supported by the United States National Science Foundation. It provides researchers with access to the A64FX processor developed by Fujitsu [17] in collaboration with RIKΞN [35, 37] for the Japanese path to exascale computing, as deployed in Fugaku [36], the fastest computer in the world [34]. By focusing on crucial architectural details, the ARMbased, multi-core, 512-bit SIMD-vector processor with ultrahighbandwidth memory promises to retain familiar and successful programming models while achieving very high performance for a