Evaluation of two Formulations of the Conjugate Gradients Method with Transactional Memory
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Abstract
Transactional Memory (TM) offers new possibilities for algorithmic design. This paper evaluates TM implementations of two algorithmic variations of the wide-spread conjugate gradients method (CG) regarding their performance on multi-core CPUs employing TM. Through applying tools for TM that visualize the TM application behavior, we show that the main bottleneck for both is the waiting times at barriers and illustrate the implementation of reduction operations with TM in a beneficial way. Performance monitoring through using the PAPI interface uncovers the quantity and type of instructions that each algorithms requires. This basic work is the key for environment-aware numerics as well as a hint for software developers who plan to use TM.Statistics
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The Engineering Mathematics and Computing Lab (EMCL), directed by Prof. Dr. Vincent Heuveline, is a research group at the Interdisciplinary Center for Scientific Computing (IWR).
The EMCL Preprint Series contains publications that were accepted for the Preprint Series of the EMCL and are planned to be published in journals, books, etc. soon.
The EMCL Preprint Series was published under the roof of the Karlsruhe Institute of Technology (KIT) until April 30, 2013. As from May 01, 2013 it is published under the roof of Heidelberg University.
Published
2013-07-01
Section
Language
en
