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Improving RDMA-based MPI Eager Protocol for Frequently-used Buffers Mohammad J. Rashti Ahmad Afsahi
 

Summary: Improving RDMA-based MPI Eager Protocol for Frequently-used Buffers
Mohammad J. Rashti Ahmad Afsahi
Department of Electrical and Computer Engineering
Queen's University, Kingston, ON, CANADA K7L 3N6
mohammad.rashti@ece.queensu.ca ahmad.afsahi@queensu.ca
Abstract
MPI is the main standard for communication in
high-performance clusters. MPI implementations use
the Eager protocol to transfer small messages. To
avoid the cost of memory registration and pre-
negotiation, the Eager protocol involves a data copy
to intermediate buffers at both sender and receiver
sides. In this paper, however, we propose that when a
user buffer is used frequently in an application, it is
more efficient to register the sender buffer and avoid
the sender-side data copy. The performance results of
our proposed Eager protocol on MVAPICH2 over
InfiniBand indicate that up to 14% improvement can
be achieved in a single medium-size message latency,
comparable to a maximum 15% theoretical

  

Source: Afsahi, Ahmad - Department of Electrical and Computer Engineering, Queen's University (Kingston)

 

Collections: Computer Technologies and Information Sciences