Design of kernel-level asynchronous collective communication

Authors:
Akihiro Nomura;Yutaka Ishikawa
Affiliations:
Dept. of Computer Science, Graduate School of Information Science and Technology, The University of Tokyo, Tokyo, Japan;Dept. of Computer Science, Graduate School of Information Science and Technology, The University of Tokyo, Tokyo, Japan
Venue:
EuroMPI'10 Proceedings of the 17th European MPI users' group meeting conference on Recent advances in the message passing interface
Year:
2010

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Abstract

Overlapping computation and communication, not only point-to-point but also collective communications, is an important technique to improve the performance of parallel programs. Since the current non-blocking collective communications have been mostly implemented using an extra thread to progress communication, they have extra overhead due to thread scheduling and context switching. In this paper, a new non- blocking communication facility, called KACC is proposed to provide fast asynchronous collective communications. KACC is implemented in the OS kernel interrupt context to perform non-blocking asynchronous collective operations without an extra thread. The experimental results show that the CPU time cost of this method is sufficiently small.