Super PI

From Wikipedia, the free encyclopedia

Super PI used to calculate 1,000,000 digits of 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 FFT arithmetic and Borwein's quartically-convergent algorithm and is a Windows port of the program used by Yasumasa Kanada in 1995 to compute Pi to 2³² digits.

1 Significance
2 Credibility concerns
3 The Future
4 References
5 External links

[edit] Significance

Super Pi is used by many overclockers to test the performance and stability of their computers. In the overclocking community, the standard program provides a benchmark for enthusiasts to compare "world record" pi calculation times and demonstrate their overclocking abilities. The program can also be used to test the stability of a certain overclock speed. If a computer is able to calculate PI to the 32 millionth place after the decimal without mistake, it is considered to be moderately stable in terms of RAM and CPU. However, longer tests with other CPU/RAM intensive calculation programs will run for hours instead of minutes and may better stress system stability. While Super Pi is not the fastest program for calculating Pi (see software for calculating π for faster alternatives), it remains very popular in the hardware and overclocking communities.

[edit] Credibility concerns

The competitive nature of achieving the best Super Pi calculation times led to fraudulent SuperPI 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.^[1] However, other methods exist of producing inaccurate or fake time results, raising questions about the program's future as an overclocking benchmark.

[edit] 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. As the calculation times become faster and faster, Super PI is also becoming a rather poor stability test due to the need for a stability test to run long enough to stress the hardware.^{[citation needed]} Many users are moving to Orthos or OCCT for their stability testing since those are multithreaded programs.^{[citation needed]}