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Sequential and parallel execution of Bernstein's condition.

Posted on 2005-05-07
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I am having a doubt in understanding an example explained by Bernstein for sequential and parallel execution order .

given was
S1 : A =B+C ,S2 : L=D+E, S3: F=G+E,S4 : C=A+F,S5 : M =G+C,S6 : A= L+C ,S7 : A= E+A.
for S1 when B and C are given as  inputs and A .
parallel : S1,S2,S3,S5  can be executed parallely
sequential ; after S1 is executed the out put (A) is taken as the input to S4 and S7 .
and my question is when S4 is executed we get the output as C which is given as input to S5 S1and S6 so how is S4 dependent on S1.
bcoz to execute S1 we need to execute S4 but S4 as the input A .Here there is an access conflict  taking place can anyone  explain me this clearly as how will the parallel and sequential execution take place.
As when i am trying to understand the logic i am able to c more acess conflicts taking place in this execution place.
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Question by:anumit
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GwynforWeb earned 1000 total points
ID: 13952830
The statements are considered as a sequence of  sequential statements

S1 : A =B+C
S2 : L=D+E
S3: F=G+E
S4 : C=A+F
S5 : M =G+C
S6 : A= L+C
S7 : A= E+A.

and can be rewritten as a dependency graph as

               S1             S2
                |               |
                |               |
S3---->----S4---->---S6
                |               |
                |               |
               S5             S7
 
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Expert Comment

by:GwynforWeb
ID: 13952831
..vertical lines have downward direction
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LVL 31

Expert Comment

by:GwynforWeb
ID: 13952932
A simple parallelisation would be

(1) S1 S2 S3
(2) S4
(3) S5 S6
(4) S7
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