SuperPi
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SuperPi is a computer program for calculating decimal digits of π. It is used as a benchmark program for measuring the speed of a CPU.
In August 1995, the calculation of pi up to 4,294,960,000 decimal digits was succeeded by using a supercomputer at the University of Tokyo. The program was written by D.Takahashi and he collaborated with Dr. Y.Kanada at the computer center, the University of Tokyo. This record-breaking program was ported to personal computer environment such as Windows NT and Windows 95 and called Super PI.
In order to calculate 33.55 million digits, it takes within 3 days with Pentium 90MHz, 40MB main memory and 340MB available storage.