Diff for "AmdahlsLaw"

Differences between revisions 15 and 32 (spanning 17 versions)

Notice that we are talking about the entire task here and that performance (speedup) is defined in terms of execution time! So we have to define the following:

This gives a new Execution time of

So we have

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-  ⇤ ← Revision 15 as of 2005-06-27 22:24:50 → 
  Size: 1105
  Editor: yakko
  Comment:
+   ← Revision 32 as of 2020-01-23 23:15:20 → ⇥
  Size: 676
  Editor: scot
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
 Line 3:
-{{{#!latex2
$$Speedup = \frac{Performance~using~enhancement~when~possible}{Performance~without~enhancement}$$
}}}
+$$$Speedup = \frac{Performance~using~enhancement~when~possible}{Performance~without~enhancement}$$$
-Line 11:
+Line 9:
-{{{#!latex2
$$SpeedupOverall = \frac{Old~Execution~Time}{New~Execution~Time}$$
}}}
+$$$Speedup Overall = \frac{Old~Execution~Time}{New~Execution~Time}$$$
-Line 15:
+Line 11:
-{{{#!latex2
$$New~Exec~Time = Old~Exec~Time \left( 1 - FractionEnhanced + \frac{FractionEnhanced}{SpeedupEnhanced}\right)$$
}}}
+This gives a new Execution time of
-Line 19:
+Line 13:
-{{{
or

                       Execution Time affected by Improvement
New Execution Time =   --------------------------------------  + Execution Time unaffected
                            Amount of Improvement (x times)
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+Line 16:
-
SpeedupOverall = --------------------------------------------
                                           FractionEnhanced
                 (1 - FractionEnhanced) + ------------------ )
                                           SpeedupEnhanced
-Line 33:
+Line 17:
-}}}