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Thursday, February 12, 2015

Communication avoiding and hiding in Krylov solvers

Wim Vanroose (U Antwerpen)

Abstract: Traditionally, Krylov solvers have been designed to minimize the number of flops to arrive at a solution. However, currently communication and synchronization overhead are now the main concern due to the dramatic increases in concurrency on all hardware. This introduces severe communication bottlenecks in Krylov solvers most importantly the latency of global reductions and the limited bandwidth to the memory. In this talk we discuss how Krylov algorithms can be redesigned to remove some of these communication bottlenecks and leading to a class of so called pipelined Krylov solvers.

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Location :  Room 611 of the Hans Freudenthal building, formerly known as the Wiskunde/Maths building, (campus De Uithof) Budapestlaan 6, Utrecht.
Date and time : Thursday, February 12, 2015 15:30-16:30. The lecture is preceded by coffee, tea, and cookies from 15.00 to 15.30 hour in the same room.