Editing Instructions per second (section)

==Thousand instructions per second (TIPS/kIPS)==
Before standard benchmarks were available, average speed rating of computers was based on calculations for a mix of instructions with the results given in [[kilo-|kilo]] instructions per second (kIPS). The most famous was the '''Gibson Mix''',<ref>{{cite tech report
 |last=Gibson
 |first=J.C. 
 |year=1970
 |title=The Gibson Mix 
 |type=Technical Report TR 00.2043
 |institution=IBM Systems Development Division
 |location=Poughkeepsie, N.Y.
}}</ref> produced by Jack Clark Gibson of IBM for scientific applications in 1959. 
Other ratings, such as the ADP mix which does not include floating point operations,  were produced for commercial applications. The thousand instructions per second (kIPS) unit is rarely used today, as most current microprocessors can execute at least a million instructions per second.

===The Gibson Mix===
Gibson divided computer instructions into 12 classes, based on the [[IBM 704]] architecture, adding a 13th class to account for indexing time. Weights were primarily based on analysis of seven scientific programs run on the 704, with a small contribution from some [[IBM 650]] programs. The overall score was then the weighted sum of the average execution speed for instructions in each class.<ref>{{cite book|url=https://ir.library.oregonstate.edu/downloads/t148fm257|title=Computer Performance and Evaluation Utilizating the Resource Planing and Management System, Masters Thesis|first=Jimmie Lynn|last=Elliot|date=June 5, 1975|publisher=Oregon State University|access-date=March 21, 2021|chapter=Appendix E, The Gibson Mix by Jack C. Gibson|pages=88–92|archive-date=12 April 2022|archive-url=https://web.archive.org/web/20220412011114/https://ir.library.oregonstate.edu/downloads/t148fm257|url-status=live}}</ref>

{| class="wikitable collapsible collapsed sortable"
! The Gibson Mix !! %
|-
| 1. Loads and Store  || 31.2
|-
| 2. Fixed Point Add and Subtract  || 6.1
|-
| 3. Compares || 3.8
|-
| 4. Branches || 16.6
|-
| 5. Floating Add and Subtract  || 6.9
|-
| 6. Floating Multiply || 3.8
|-
| 7. Floating Divide || 1.5
|-
| 8. Fixed Point Multiply || 0.6
|-
| 9. Fixed Point Divide || 0.2
|-
| 10. Shifting  || 4.4
|-
| 11. Logical, And, Or, etc. || 1.6
|-
| 12. Instructions Not Using Registers  || 5.3
|-
| 13. Indexing || 18
|-
|  || 
|-
| Total || 100
|}