Reply on RC2
Yuejin Ye
- 25 Jan 2022
TL;DR: This work developed an ocean model called swNEMO_v4.0 based on a new-generation Sunway supercomputer and obtained significant modeling performance by sophisticated tuning methods that fully exploited the computing recourses of the new machine.
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Abstract: This work developed an ocean model called swNEMO_v4.0 based on a new-generation Sunway supercomputer and obtained significant modeling performance by sophisticated tuning methods that fully exploited the computing recourses of the new machine. Optimizing methods proposed are based on the architectural features, and thus achieves promising modeling performance. Thread-level communication and mixed-precision arithmetic are very attractive approach today, and this work demonstrates the possibility of applying them into resolving the most complicated scientific project such as ocean model. Firstly, in order to scale the ocean model onto the large-scale and extremely complicated supercomputer, four-level parallel framework are proposed. Sophisticated tuning techniques such as customizable domain decomposition according to the grid feature, are included as well. This enables the capability of fully utilizing the rich computing resources of the new system. The new feature of the system, thread-level RMA communication mechanism, is also wisely used for algorithms such as composite blocking, to further optimize the bandwidth performance. Moreover, mixed-precision optimization is proposed and performed on certain part of the algorithms. With sufficient material and proof to support its feasibility. Significant performance speedup is obtained thanks to these innovations. About 20 million cores are used for the large-scale test, and sustained performance of nearly 2 Petaflops. These innovations are solid, and can be very interesting to domain experts that expect to perform similar work by using the new Sunway supercomputer or other supercomputers with alike architecture. Besides, the work is also very useful for computer scientists like me, to rethink the architecture design for better supporting numerical scientific applications. I have no further comments, but some minor suggestions.
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References
Bedmap2: improved ice bed, surface and thickness datasets for Antarctica
Peter T. Fretwell,Hamish D. Pritchard,David G. Vaughan,Jonathan L. Bamber,Nicholas E. Barrand,Ruth Bell,Cesidio Bianchi,Robert Bingham,Donald D. Blankenship,Gino Casassa,Ginny A. Catania,Denis Callens,Howard Conway,Alison J. Cook,Hugh F. J. Corr,Detlef Damaske,Volkmar Damm,Fausto Ferraccioli,René Forsberg,Shuji Fujita,Y. Gim,Prasad Gogineni,J. A. Griggs,Richard C. A. Hindmarsh,Per Holmlund,John W. Holt,Robert W. Jacobel,Adrian Jenkins,Wilfried Jokat,Tom A. Jordan,Edward C. King,Jack Kohler,William B. Krabill,M. Riger-Kusk,Kirsty Langley,German Leitchenkov,Carl Leuschen,Bruce P. Luyendyk,Kenichi Matsuoka,Jeremie Mouginot,F. O. Nitsche,Yoshifumi Nogi,Ole Anders Nøst,S. V. Popov,Eric Rignot,David M. Rippin,Andrés Rivera,Jason L. Roberts,Neil Ross,Martin J. Siegert,Andrew Smith,Daniel Steinhage,Michael Studinger,Bo Sun,B. K. Tinto,Brian C. Welch,Douglas S. Wilson,Duncan A. Young,Cui Xiangbin,Achille Zirizzotti +59 more
TL;DR: Bedmap2 as discussed by the authors is a suite of gridded products describing surface elevation, ice-thickness and the seafloor and subglacial bed elevation of the Antarctic south of 60° S. In particular, the Bedmap2 ice thickness grid is made from 25 million measurements, over two orders of magnitude more than were used in Bedmap1.
Ice-Shelf Melting Around Antarctica
TL;DR: Detailed glaciological estimates of ice-shelf melting around the entire continent of Antarctica show that basal melting accounts for as much mass loss as does calving, making ice- shelf melting the largest ablation process in Antarctica.
Four decades of Antarctic Ice Sheet mass balance from 1979-2017.
Eric Rignot,Eric Rignot,Jeremie Mouginot,Jeremie Mouginot,Bernd Scheuchl,Michiel R. van den Broeke,Melchior van Wessem,Mathieu Morlighem +7 more
TL;DR: During the entire period, the mass loss concentrated in areas closest to warm, salty, subsurface, circumpolar deep water (CDW), consistent with enhanced polar westerlies pushing CDW toward Antarctica to melt its floating ice shelves, destabilize the glaciers, and raise sea level.
Ice Flow of the Antarctic Ice Sheet
TL;DR: A reference, comprehensive, high-resolution, digital mosaic of ice motion in Antarctica assembled from multiple satellite interferometric synthetic-aperture radar data acquired during the International Polar Year 2007 to 2009 reveals widespread, patterned, enhanced flow with tributary glaciers reaching hundreds to thousands of kilometers inland over the entire continent.
Deep glacial troughs and stabilizing ridges unveiled beneath the margins of the Antarctic ice sheet
Mathieu Morlighem,Eric Rignot,Tobias Binder,Donald D. Blankenship,Reinhard Drews,Reinhard Drews,Graeme Eagles,Olaf Eisen,Fausto Ferraccioli,René Forsberg,Peter T. Fretwell,Vikram Goel,Jamin S. Greenbaum,Hilmar Gudmundsson,Jingxue Guo,Veit Helm,Coen Hofstede,Ian M. Howat,Angelika Humbert,Wilfried Jokat,Nanna B. Karlsson,Won Sang Lee,Kenichi Matsuoka,Romain Millan,Jeremie Mouginot,John Paden,Frank Pattyn,Jason L. Roberts,Sebastian Rosier,Antonia Ruppel,Helene Seroussi,Emma Smith,Daniel Steinhage,Bo Sun,Michiel R. van den Broeke,Tas van Ommen,Melchior van Wessem,Duncan A. Young +37 more
TL;DR: In this paper, a high-resolution and physically based description of Antarctica bed topography using mass conservation is presented, revealing previously unknown basal features with major implications for glacier response to climate change.