Diff for "Performance"

Differences between revisions 1 and 9 (spanning 8 versions)

Subect: Architecture-Performance

Performance is a subjective quatity that is often argued about by those who are affected by it. However we can make a general statement about performance:

performance = 1 / (Execution time or response time)

The more general problem comes when we start agregating different performance metrics. Say we run 5 different programs and measure their running time. How do we agregate them? We can use a weighted average or a straight sum average.

Relative Performance

                                    Execution Time of Y     1/Performance Y     Performance X
If X is n times faster than Y, n = --------------------- = ----------------- = ---------------
                                    Execution Time of X     1/Performance X     Performance Y

System Performance is based on the ElapsedTime of an unloaded system
Cpu Performance is pased on the CPU Execution time (CpuTime - user time)

Peformance must be tied to execution time, no other measure of performance works!

See ThroughPut, ResponseTime, CyclesPerInstruction, GeometricMean

Back to ComputerTerms

-  ⇤ ← Revision 1 as of 2004-01-14 23:10:53 → 
  Size: 295
  Editor: dot
  Comment:
+   ← Revision 9 as of 2004-02-18 00:09:14 → ⇥
  Size: 1213
  Editor: yakko
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
 Line 8:
-performance = 1 / (running time)
+performance = 1 / (Execution time or response time)
 Line 11:
+The more general problem comes when we start agregating different performance metrics. Say we run 5 different programs and measure their running time. How do we agregate them? We can use a weighted average or a straight sum average. 

'''Relative Performance'''

{{{
                                    Execution Time of Y     1/Performance Y     Performance X
If X is n times faster than Y, n = --------------------- = ----------------- = ---------------
                                    Execution Time of X     1/Performance X     Performance Y
}}}

   * '''System Performance''' is based on the ElapsedTime of an unloaded system
   * '''Cpu Performance''' is pased on the CPU Execution time (CpuTime - user time)

''' ''Peformance must be tied to execution time, no other measure of performance works!'' '''

See ThroughPut, ResponseTime, CyclesPerInstruction, GeometricMean