Subject: Re: Request to review a paper C507 From: John Z Lou Date: Tue, 5 Jun 2001 15:02:21 -0700 (PDT) To: fox@csit.fsu.edu CC: jzlou@aig.jpl.nasa.gov Dear Professor Fox, Attached is my review report. John Z. Lou Exploration Systems Autonomy Section (367) Mail Stop: 126-347 (Voice) 818-354-4870 (FAX) 818-393-4965 John.Z.Lou@jpl.nasa.gov --- * Paper Number Cnnn: C507 * Date: June 1, 2001 * Paper Title: Parallel Multilevel Iterative Linear Solvers with Un structured Adaptive Grids for Simulations in Earth Science * Author(s): Kengo Nakajima * Referee: John Z. Lou * Address: Jet Propulsion Laboratory California Institute of Technology MS 126-347 4800 Oak Grove Drive Pasadena, CA 91109 Referee Recommendations. Please indicate overall recommendations here, and details in following sections. 1. publish as is x 2. accepted provided changes suggested are made 3. reject D: Referee Comments (For Editor Only) This paper describes an application of the advanced computational technique of multigrid-based preconditioning approach to solving a class of important earth science application problems on parallel computers. The computational algorithms presented are well known in the computational fluid dynamics community, and the multigrid approach to solving Poisson pressure equation is almost standard in a Navier-Stokes solver. The parallel computing work and application results discussed in the paper are probably still interesting to modeling scientists in the computational earth science community. It should be made more clear how the preconditioning step is used in the multigrid V-cycle solution process. Some discussion would be useful on the tradeoffs between the levels used in the V-cycle and the parallel computing efficiency, and how to optimize the time-to-solution, similar for tradeoff between using shallow and deep adaptations. E: Referee Comments (For Author and Editor) Same as above How less than 1% communication overhead, as claimed in the paper, would result in the scaling curve in Fig. 9 on upto 128 PE? F: Presentation Changes Some words should be changed to make the sentences more readable. Last paragraph in Section 2 (Multigrid Method: Overview) should be made more specific and readable. I am not very clear what it says. > From fox@csit.fsu.edu Mon Apr 23 16:27:16 2001 > X-UIDL: 49dd02f9d1603e50cbadc3c709d1a67c > Date: Mon, 23 Apr 2001 19:26:19 -0700 > From: Geoffrey Fox > User-Agent: Mozilla/5.0 (Windows; U; Win98; en-US; m18) Gecko/20010131 Netscape6/6.01 > X-Accept-Language: en > MIME-Version: 1.0 > To: John Lou > Subject: Request to review a paper C507 > Content-Transfer-Encoding: 7bit > > I wondered if you could referee this paper from Japan for a Special issue I > am preparing for Concurrency and Computation: Practice and Experience > The deadline I have set is June 15 2001. I thank you for your help. > Geoffrey Fox > > -------------------------------- ACES Special Issue ------------------------------ > ACES is the APEC (the Asia Pacific Economic Cooperation) Cooperation for Earthquake Simulation > > see http://quakes.earth.uq.edu.au/ACES and > http://www.quakes.uq.edu.au/ACES/WG/WG5/index.html > This paper is one of a set on computational approaches to Earthquake Science > and the issue will contain both application and computer science related papers > This paper is one of a set from "Earth Simulator" project. > Please be tolerant of "interdisciplinary issues" in review! > > --------------------------------------------------------------------------- > I am editor for a practical computer/computational science journal > Concurrency and Computation:Practice and Experience. > > I thought you might be able to provide me a referee report by June 15 2001 on the paper > C507: Parallel Multilevel Iterative Linear Solvers with Unstructured Adaptive Grids > for Simulations in Earth Science > http://aspen.csit.fsu.edu/CCPEwebresource/C507nakajima10/KengoNAKAJIMA_MG.pdf > > Abstract:Preconditioned iterative solver is one of the most powerful choice such as > IC (Incomplete Cholesky) or ILU (Incomplete LU) factorization method for large- > scale scientific computation. But in these methods, iteration number until > convergence increases as the problem size becomes larger. In multigrid solvers, the > rate of convergence is independent of problem size and the number of iterations > remains fairly constant. Multigrid is also a good preconditioner for Krylov > iterative solvers. In this study, multigrid preconditioned conjugate gradient > iterative method (MGCG) on parallel computers has been developed and applied to the > Poisson equation in the region between dual sphere surfaces on semi-unstructured > prismatic grids generated adaptively. Moreover this procedure has been applied to > the grids with local refinement. Computational results on Hitachi SR2201 using up > to 128 processors show good scalability of the developed method. > > Kengo Nakajima > Department of Computational Earth Sciences, Research Organization for Information > Science and Technology (RIST), Tokyo, Japan > Email: nakajima@tokyo.rist.or.jp > > > I am switching the journal to completely electronic form and hope you could email > me a report. Please send a short email if you can or cannot do this > > Please do this in "free form" mentioning paper metadata above > Alternatively use form appended. > Note you can find the form and some other information at: > http://aspen.csit.fsu.edu/CandCPandE/index.html > > Thank you > Geoffrey > > --------------------------------------------------------------------------- > > CandC:PandE Referee Report Form -- Electronic Transimission to > fox@csit.fsu.edu strongly preferred > Referees Web Page: http://aspen.csit.fsu.edu/CandCPandE/ > Email fox@csit.fsu.edu for URL of full paper to be reviewed > > WILEY Journal Home Page > http://www3.interscience.wiley.com/cgi-bin/jtoc?ID=5361 > > John Wiley and Sons, Ltd. > Baffins Lane, Chichester > West Sussex, PO19 1UD, England > Telephone: (01243) 779777 > Fax: (01243) 770379 > > REFEREE'S REPORT > > Concurrency and Computation:Practice and Experience > > --------------------------------------------------------------------------- > > A: General Information > > Please return to: > Geoffrey C. 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Your identity will of course not be revealed > to the author. > > C: Paper and Referee Metadata > > * Paper Number Cnnn: > > * Date: > > * Paper Title: > > * Author(s): > > * Referee: > > * Address: > > Referee Recommendations. Please indicate overall recommendations here, and > details in following sections. > > 1. publish as is > 2. accepted provided changes suggested are made > 3. reject > > D: Referee Comments (For Editor Only) > > E: Referee Comments (For Author and Editor) > > F: Presentation Changes > > > > > > > > > > > > > > > >