SLIDE 1
Variation points
- Accomodate for change
- Partial differential equation solvers
- Which coordinate system? How many dimensions?
Patterns for Modern Fortran Variation points Accomodate for change - - PowerPoint PPT Presentation
Patterns for Modern Fortran Variation points Accomodate for change - - PowerPoint PPT Presentation
High-Performance Design Patterns for Modern Fortran Variation points Accomodate for change Partial differential equation solvers Which coordinate system? How many dimensions? Coordinate-free programming Independent of dimension,
SLIDE 2
SLIDE 3
Coordinate-free programming
- Independent of dimension, coordinate systems etc.
- Mathematically and computationally precise.
SLIDE 4
Modern fortran
- Class abstraction
- Array operations
- Coarrays
- Prohibits function results containing coarrays
SLIDE 5
Design patterns
- Object superclass and error tracing
- Compute globally, return locally
SLIDE 6
Pattern tradeoffs
- Object pattern
- Lightweight performance
- Heavyweight in source code writings
- Compute globally return locally
SLIDE 7
Weak scaling
- One dimensional burgers equation
- Weak scaling coarray on Cray:
- Each core is assigned a fixed data size of 97 5 values for
time steps, syncing each time step
SLIDE 8
Strong scaling
- 409600 grid points
- MPI faster
- Superlinear speedup
SLIDE 9
Execution profiles
- Communication most expensive.
- Sync more expensive than Sendrecv.
SLIDE 10
Code complexity
- MPI more complex