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Realm active message benchmark

Wei Wu requested to merge am-bench into realm-bench

This benchmark will benchmark the performance of active message varies by message size. This is a ping pong test, so the latency reported is the round trip performance.

This benchmark contains a alltoall and fan (bcast) mode. When -alltoall is enabled, each processor issues a AM to all other ranks; when it is disabled, only the processor 0 on rank 0 issues a AM to all other ranks.

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