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Q. Example on Distribution of Data?
!HPF$ PROCESSORS P1(4)
!HPF$ TEMPLATE T1(18)
!HPF$ DISTRIBUTE T1(BLOCK) ONTO P1
Consequently of these instructions distribution of data would be as displayed in Figure below.
Figure: Block Distribution of Data
In a alternative of block distribution the number of template elements assigned to every processor may be explicitly specified as in
!HPF$ DISTRIBUTE T1 (BLOCK (6)) ONTO P1
Distribution of data will be as displayed in Figure below.
Figure: Variation of Block Distribution
It means we assign all template elements before exhausting processors and some processors are left empty.
(b) Cyclic Distribution
Simple cyclic distribution is specified by
!HPF$ DISTRIBUTE T1(CYCLIC) ONTO P1
The first processor gets first template element and second gets second and so on. When a set of processors is exhausted go back to first processor and carry on allocating template elements from there.
What is FIFO? FIFO is used as buffering element or queuing element into the system that is by common sense, is needed only while you slow at reading than the write operation.
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