Super PI

Super PI is a computer program that calculates pi to a specified number of digits after the decimal point—up to a maximum of 32 million. It uses Gauss–Legendre algorithm and is a Windows port of the program used by Yasumasa Kanada in 1995 to compute pi to 232 digits.

Super PI
Operating systemWindows
TypeBenchmark
Super PI finishing a calculation of 1,048,576, or 220 digits of pi

Significance

Super PI is popular in the overclocking community, both as a benchmark to test the performance of these systems[1][2] and as a stress test to check that they are still functioning correctly.[3]

Credibility concerns

The competitive nature of achieving the best Super PI calculation times led to fraudulent Super PI results, reporting calculation times faster than normal. Attempts to counter the fraudulent results resulted in a modified version of Super PI, with a checksum to validate the results. However, other methods exist of producing inaccurate or fake time results, raising questions about the program's future as an overclocking benchmark.

Super PI utilizes x87 floating point instructions which are supported on all x86 and x86-64 processors, current versions which also support the lower precision Streaming SIMD Extensions vector instructions.

The future

Super PI is single threaded, so its relevance as a measure of performance in the current era of multi-core processors is diminishing quickly. Therefore, wPrime has been developed to support multiple threaded calculations to be run at the same time so one can test stability on multi-core machines. Other multithreaded programs include: Hyper PI, IntelBurnTest, Prime95, Montecarlo superPI, OCCT or y-cruncher. Last but not least, while SuperPi is unable to calculate more than 32 million digits, and Alexander J. Yee & Shigeru Kondo were able to set a record of 10 Trillion 50 Digits of Pi using y-cruncher under a 2 x Intel Xeon X5680 @ 3.33 GHz - (12 physical cores, 24 hyperthreaded) computer on October 16, 2011[4] Super PI is much slower than these other programs, and utilizes inferior algorithms to them.

gollark: I assume it has an on-chip iGPU of some sort.
gollark: Maybe the GPU drivers are wrong somehow?
gollark: Can you not just install in text mode?
gollark: It's browser-dependent. Probably in a database in the browser's app data folders somewhere.
gollark: Put a textarea in the HTML part of your thing, and some buttons to save/~~edit~~/delete etc. Those can read the `value` property of it and save it to localstorage (you should also read its contents and set the value to that on page load).

References
  1. Maekinen, Sami (2006), CPU & GPU Overclocking Guide (PDF), ATI Technologies Inc.
  2. Martinović, G.; Balen, J.; Rimac-Drlje, S. (2010), "Impact of the host operating systems on virtual machine performance", 2010 Proceedings of the 33rd International Convention MIPRO, IEEE, pp. 613–618.
  3. Sanchez, Ernesto; Squillero, Giovanni; Tonda, Alberto (2011), "Evolutionary Failing-test Generation for Modern Microprocessors" (PDF), Proceedings of the 13th Annual Conference Companion on Genetic and Evolutionary Computation (GECCO '11), New York, NY, USA: ACM, pp. 225–226, doi:10.1145/2001858.2001985, ISBN 978-1-4503-0690-4.
  4. Round 2... 10 Trillion Digits of Pi, numberworld.org
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