The Clansman ha scritto:DEVIL ha scritto:The Clansman ha scritto:ma che roba è???

chi il superpi?
yesse!

Outline of 4.2 billion calculation of pi
Our latest record was established as the followings:
Declared record:
4,294,460,000 decimal digits
Two independent calculation based on two different algorithms generated 4,294,967,296 (=2^32) decimal digits of pi and comparison of two generated sequences matched 4,294,967,286 decimal digits, e.g., 10 decimal digits difference. Then we are declaring 4,294,960,000 decimal digits as the new world record.
Main program run:
Job start(1-st) : 28th July 1995 22:59
Job end (1-st) : 31st July 1995 07:42
Elapsed time (1-st) : 56:44:24
Vector CPU (1-st) : 67:33:04
Job start (2-ed) : 04th Aug. 1995 20:38
Job end (2-ed) : 07st Aug. 1995 05:35
Elapsed time (2-ed) : 56:57:11
Vector CPU (2-nd) : 66:15:37
Main memory : 1792.75 MB
ES memory : 25120 MB
Disk storage : 2 GB * 2 = 4 GB (as for the intermediate data storage)
Algorithm : Borwein's 4-th order convergent algorithm
Verification program run:
Job start (1-st) : 11th Aug. 1995 21:31
Job end (1-st) : 14st Aug. 1995 15:54
Elapsed time (1-st) : 66:23:29
Vector CPU (1-st) : 77:14:59
Job start (2-ed) : 25th Aug. 1995 23:12
Job end (2-ed) : 28st Aug. 1995 15:09
Elapsed time(2-ed) : 63:57:22
Vector CPU : 75:10:29
Main memory : 1792.75 MB
ES memory : 26152 MB
Disk storage : 2 GB * 3 = 6 GB (as for the intermediate data storage)
Algorithm : Gauss-Legendre algorithm
4,000,000,000-th digits of pi and 1/pi:
pi : 94375 34306 22684 47216
1/pi: 71480 70425 69013 58924
^
Last number is 4,000,000,000-th.
(First digit '3' for pi or '0' for 1/pi is not included in the above count.)
Frequency distribution for pi-3 up to 4,000,000,000 decimal places:
'0' : 400001233; '1' : 400002285; '2' : 399965405; '3' : 399984469
'4' : 400006936; '5' : 399989052; '6' : 400033035; '7' : 399996122
'8' : 400004741; '9' : 400016722; Chi square = 7.55
Frequency distribution for 1/pi up to 4,000,000,000 decimal places:
'0' : 400003502; '1' : 400016211; '2' : 400002106; '3' : 399991609
'4' : 399987516; '5' : 399972897; '6' : 400003565; '7' : 400018249
'8' : 399999949; '9' : 400004396; Chi square = 4.01
4,294,960,000-th digits of pi and 1/pi:
pi : 55675 13149 35865 45528
1/pi: 96350 29339 14953 51156
^
Last number is 4,294,960,000-th.
(First digit '3' for pi or '0' for 1/pi is not included in the above count.)
A developer and calculating machine:
Programs were written by Mr. Daisuke TAKAHASHI, a member of Kanada Lab. CPU used was HITAC S-3800/480 at the Computer Centre, University of Tokyo. Two CPU were definitely used through single job parallel processing for total of four programs run.
piu o meno è quello che volevo dire...