206 billion digits of pi
    Posted by: "s_pagliarulo" s_pagliarulo@hotmail.com s_pagliarulo
    Date: Thu Jun 19, 2008 9:09 pm ((PDT))

The 1999 world record pi computation of 206 billion digits by Y. 
Kanada and D. Takahashi using a Hitachi SR8000 supercomputer has been matched by a home computer. Shigeru Kondo has computed 206,200,000,000 digits using the 64-bit version of QuickPi v4.5 in approximately 1850 hours (77 days). 

The Hitachi supercomputer used in 1999 computed 206,158,430,000 digits and took about 37 about hours for the main run and 46 hours for the verification using 128 nodes (processors) and 865GB of memory. The record held until 2002 when Kanada and his team computed
1.2 trillion digits using a Hitachi SR8000/MPP. That calculation (including verification and radix conversion) required 602 hours using 64 nodes and 1TB of memory.

Kondo's PC has dual Intel X5460 processors, 64GB of memory, 2TB of disk space and Windows Server 2003 R2 x64.

The calculation result is shown below and has been verified with data from the University of Tokyo.

QRD-QuickPi binary reader v4.5 for x64, (c) 2000-2008 S. Pagliarulo Freely distributable, email: s_pagliarulo@hotmail.com
 
o Created by QuickPi version 4.5 (x64)
o Intel(R) Xeon(R) CPU X5460 @ 3.16GHz detected o Processor speed measured at 3.17 GHz o Dual processors, each with quad cores o 62.2 GB of memory available o Maximum number of threads set to 8 o Using custom training data
 
Computation of Pi to 206,200,000,000 digits Method used : Chudnovsky Started : Thu Apr 03 23:19:40 2008
 
Series size : 14539918620  (206,200,000,005 digits) Series processing time : 5189311.84 Final value time : 1470233.11
 
Total time : 6659545.05 seconds (77 days, 1 hour, 52 mins, 25.05 secs) Total memory used : 66,766,524,850 (62.18 GB)
 
Total disk space used : 1,038,898,298,880 (967.55 GB) Time spent swapping : 62808.64 (1621.64 reading, 61187.00 writing)
 
Processor utilization : 193.84%
 
Listing 100 digits of Pi (206,158,429,901 - 206,158,430,000)
 
6698678603 7251917599 9383353765 8449942800 2641398549  : 206158429950
8138035487 2727220243 6639443780 2214496687 5515730964  : 206158430000
 
8614936178 2910791153 4443607291 9665696203 7329712945  : 99999999950
9536515199 6948432428 3185077669 0674614692 0191295669  : 100000000000
 
9210366471 8253920158 5279099580 3609723371 5037170599  : 199999999950 4305017750 7056695457 1580141586 9082820114 5623831042  : 200000000000




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