Sunday, August 8, 2010

π(pi) is the well known symbol for all mathematicians out there. It is mostly used in geometrical calculation. First value of π was put forward by Indian mathematician srinivas ramanujam! Now, the π is making news again. A Japanese and an American whizzes claim that they have calculated the value of π to 5 trillion decimal places.

For all the enthusiasts here are the technical data used by the duo to achieve this feat!

Shigeru Kondo's computer had the following specifications:
Processor
2 x Intel Xeon X5680 @ 3.33 GHz - (12 physical cores, 24 hyperthreaded)
Memory
96 GB DDR3 @ 1066 MHz - (12 x 8 GB - 6 channels) - Samsung (M393B1K70BH1)
Motherboard
Asus Z8PE-D12
Hard Drives
1 TB SATA II (Boot drive) - Hitachi (HDS721010CLA332) 3 x 2 TB SATA II (Store Pi Output) - Seagate (ST32000542AS) 16 x 2 TB SATA II (Computation) - Seagate (ST32000641AS)
Raid Controller
2 x LSI MegaRaid SAS 9260-8i
Operating System
Windows Server 2008 R2 Enterprise x64
Built By
Shigeru Kondo


Software for Computation:
The program that was used for the main computation is y-cruncher v0.5.4.9138 Alpha.


See main page: y-cruncher - A Multi-Threaded Pi Program

y-cruncher is a powerful multi-threaded
program/benchmark that is becoming an increasingly popular tool within the computer enthusiast community. As of this writing, it also holds the world record for most digits computed for several other famous constants.

For the main computation, the following formula was used:

Chudnovsky Formula:

Verification was done using the following two BBP formulas:

Plouffe's Formula:


Bellard's Formula:


Technical details [via]