Basic HTML version of Foils prepared August 7 98

Foil 6 Fortran 90/95 Memory Allocation

From DoD HPF Training -- 2. Fortran90 DoD Training and Others -- 1995-98. by Chuck Koelbel -- Rice University
1 ALLOCATABLE arrays use heap storage
  • Declared without defined bounds
  • ALLOCATE & DEALLOCATE statements create and free storage
2 Local arrays use stack storage
  • Bounds may be non-constant, evaluated at procedure entry
  • E.g., local arrays the same size as a dummy parameter
3 Assumed-shape arrays can pass array sizes
  • Dummy parameters without declared bounds
  • Compiler passes bounds in a data descriptor
  • Bounds can be queried with intrinsics
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