Project:

  Vectorize and validate POP1.4-DML Ocean Model on Cray X1

Mission:

  Provide a version of the POP-DML code which offers good performance
  on both scalar and vector architectures.

Goals:

  Obtain latest POP-DML code and perform any modifications necessary to
  provide for vectorization for use on the Cray X1.

  Validate model on the Cray X1 and scalar platforms to demonstrate
  correct results, improved performance on the Cray X1, and no performance
  degredation on other platforms.

  Check in model code to the CVS repository.

Motivation:

  Use of the Cray X1 as a platform for performing ocean biogeochemistry
  simulations.

Authority:

  Mariana Vertenstein, Keith Lindsay, Keith Moore, Scott Doney, and John Drake

Project Lead(s):

  George Carr and Forrest Hoffman

Implementation Plan:

    I. Obtain latest POP1.4-DML code, compile on Cray X1, and scope out
       vectorization requirements.


   II. Rewrite model code as necessary to generate vectorizable loops
       that compile and run on the Cray X1.

  III. Test standard POP-DML model run on the IBM to demonstrate that
       only round-off level differences are evident in model results and
       that model performance has not been degraded.  Perform model tests
       on the Cray X1 to show that only round-off level differences
       are evident in model results and that model performance has
       been improved.

   IV. Get code modifications reviewed by developers and accepted for
       check in to the code repository.

Resources:

             I   II  III   IV
          ===================
   George   40   40   10   10  ~hours
  Forrest   10   10   10   10
           ---  ---  ---  ---
    Total   50   50   20   20

    Total man months:  1.0


Timeline:

    I. October 7-October 15, 2004

    Timeline for additional phases depends on the outcome of Phase I.