HTML version of Scripted Foils prepared 11 November 1996

Foil 29 New Data Mapping Features in HPF 2.0 - I

From CPS615-End of Numerical Integration and Very End of HPF Delivered Lectures of CPS615 Basic Simulation Track for Computational Science -- 24 October 96. by Geoffrey C. Fox *
Secs 208.8
1 !HPF DISTRIBUTE x( BLOCK(SHADOW = 1 ) )
  • is designed to help compiler by specifying that it should set up a guard ring each side of BLOCK in each processor. In example Guard ring has extent 1
  • If x has dimension 100 and 4 processors, we allocate storage for
  • x(1..26) in Processor 1
  • x(24..51) in Processor 2
  • x(49..76) in Processor 3
  • x(74..100) in Processor 4
2 !HPF DISTRIBUTE x( BLOCK( /26,24,24,26/ ) )
  • is designed to specify general BLOCK distribution with in above example
  • x(1..26) in Processor 1
  • x(26..50) in Processor 2
  • x(51..76) in Processor 3
  • x(77..100) in Processor 4
3 !HPF DISTRIBUTE x( INDIRECT(map_array) )
  • is designed to allow an arbitary user array to specify location of x(i)
  • the processor number in map_array(i) would be typically be calculated by your favorite load balancing routine!
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