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Next: Allocatable Arrays and Up: Data Alignment and Previous: ALIGN and REALIGN

DYNAMIC Directive

The DYNAMIC attribute specifies that an object may be dynamically realigned or redistributed. XBNF dynamic-directive -to -rule to to is DYNAMIC alignee-or-distributee-list

alignee-or-distributee -to -rule to to is alignee -to or distributee XBNF

• An object in COMMON may not be declared DYNAMIC and may not be aligned to an object (or template) that is DYNAMIC. (To get this kind of effect, Fortran 90 modules must be used instead of COMMON blocks.)
• An object with the SAVE attribute may not be declared DYNAMIC and may not be aligned to an object (or template) that is DYNAMIC.

A REALIGN directive may not be applied to an alignee that does not have the DYNAMIC attribute. A REDISTRIBUTE directive may not be applied to a distributee that does not have the DYNAMIC attribute.

A DYNAMIC directive may be combined with other directives, with the attributes stated in any order, consistent with the Fortran 90 attribute syntax.

Examples: !HPF DYNAMIC:: A,B,C,D,E !HPF ALIGN WITH SNEEZY, DYNAMIC:: X,Y,Z !HPF DISTRIBUTE(BLOCK, BLOCK), DYNAMIC :: X,Y The first two examples mean exactly the same thing. The next two examples mean exactly the same second thing. The last two examples mean exactly the same third thing.

The three directives !HPF DISTRIBUTE(BLOCK, BLOCK) ONTO P:: A,B,C,D !HPF TEMPLATE, DISTRIBUTE(BLOCK, BLOCK) ONTO P, & !HPF DIMENSION(64,64),DYNAMIC :: A,B,C,D