PPT Slide

Project 2: AGCM Time Integration Speedup

• Purpose:

  • Increase AGCM output speed
  • Exploit MPPs

• Methods

  • Extend time step (_t), assuming additional calculations spread out on many processors
  • Find alternative integration schemes which allow either larger _t or make calculations for fixed _t faster.

• Tests - Higher order time integrations

  • Taylor Series; get higher order terms from prediction equations. Works well with low-order systems.
  • Padé approx; improved convergence over TS for low-order systems.
  • Multi-level scheme; better, and avoids costly higher derivative calculations.

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