The TOMS paper "A Fully Portable High Performance Minimal Sotrage Hybrid Format Cholesky Algorithm" by Andersen, Gunnels, Gustavson, Reid, and Wasniewski, used a level 3 Cholesky kernel subroutine instead of level 2 LAPACK routine _POTF2. We discuss the merits of this approach and show that its performance over _POTRF is consideraby improved on a variety of common platforms when _POTRF is soley restriced to calling _POTF2.
By: Fred G. Gustavson; Jerzy Wasniewski; Jack J. Dongarra
Published in: RC24727 in 2009
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