Simulations of Below-Ground Dynamics of Fungi: 1.184 Pflops Attained by Automated Generation and Autotuning of Temporal Blocking Codes
SessionACM Gordon Bell Finalist I
Session ChairSubhash Saini
Authors
Event Type
ACM Gordon Bell Finalist
Performance
Programming Systems
Scientific Computing
TimeWednesday, November 16th11:30am - 12pm
Location255-EF
DescriptionStencil computation has many applications in science and engineering, thus many optimization techniques such as temporal blocking have been developed. They are, however, rarely used in real-world applications, since a large amount of careful programming is required for even the simplest of stencils. We introduce Formura, a domain specific language that provides easy access to optimized stencil computations. Higher-order integration schemes can be defined using mathematical notations. Formura generates C code with MPI calls and performs autotuning. Hence its performance is portable to most distributed-memory computers. We show the scientific applicability of Formura by performing magnetohydrodynamics (MHD) and below-ground biology simulations. Ability to reach bytes-per-flops ratio only attainable by temporal blocking is demonstrated. We also demonstrate scaling up to the full nodes of the K computer, with 1.184 Pflops, 11.62% floating-point-operation efficiency, and 31.26% memory throughput efficiency.
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Paper provided by the IEEE Computer SocietyPaper also available from the ACM Digital Library
Authors
Junichiro Makino (presenting)
Keigo Nitadori (presenting)
Masaki Iwasawa (presenting)
Natsuki Hosono (presenting)
