你的CPU算1000万位PI需要多久？
superpi 1.5比较老了，现在pifast 4.3操作简便而且计算PI效率比较高下载地址：http://numbers.computation.free.fr/Constants/PiProgram/pifast.zip
我的U很老了，E6550 2.33G，拿出来抛砖引玉
☆算PI 1000万位，选的是no Disk memory ，1024FFT，计算占用内存60M，只用了34.66秒，算出来的结果有12.7MB大
Program : PiFast version 4.3 (fix 1), by Xavier Gourdon
Computation of 10000000 digits of Pi
Method used : Chudnovsky
Size of FFT : 1024 K
Physical memory used : ~ 61355 K
Disk memory used : ~ 0.00 Meg
------------------------------------------------------------
Computation run information :
Start : Thu Oct 29 21:23:51 2009
End : Thu Oct 29 21:24:25 2009
Duration : 34.66 seconds
============================================================
Total computation time : 34.66 seconds (~ 0.01 hours)
============================================================
☆算PI 1亿位，no Disk memory ，8192FFT，计算占用内存500M，用了508.23秒，算出来的结果有129MB大
Program : PiFast version 4.3 (fix 1), by Xavier Gourdon
Computation of 100000000 digits of Pi
Method used : Chudnovsky
Size of FFT : 8192 K
Physical memory used : ~ 525521 K
Disk memory used : ~ 0.00 Meg
------------------------------------------------------------
Computation run information :
Start : Thu Oct 29 21:27:48 2009
End : Thu Oct 29 21:36:16 2009
Duration : 508.23 seconds
============================================================
Total computation time : 508.23 seconds (~ 0.14 hours)
============================================================
☆算PI 10亿位，basic Disk memory ，32768FFT，计算占用内存1500M，用了11111.88秒(其中Disk memory读写时间2604秒)，算出来的结果有1.28GB大
Program : PiFast version 4.3 (fix 1), by Xavier Gourdon
Computation of 1000000000 digits of Pi
Method used : Chudnovsky
Size of FFT : 32768 K
Physical memory used : ~ 1577920 K
Disk memory used : ~ 1907.35 Meg
------------------------------------------------------------
Computation run information :
Start : Thu Oct 29 22:19:29 2009
End : Fri Oct 30 01:24:41 2009
Duration : 11111.88 seconds
Time spent in disk swapping : 2604 s (reading 1019, writing 1585)
============================================================
Total computation time : 11111.88 seconds (~ 3.09 hours)
============================================================
PI=
3.1415926............................................................................................................7139868209 3196353628 2046127557 1517139511 5275045519
所以....PI的第10亿位数是9 Program : PiFast version 4.3 (fix 1), by Xavier Gourdon
Computation of 10000000 digits of Pi
Method used : Chudnovsky
Size of FFT : 1024 K
Physical memory used : ~ 61355 K
Disk memory used : ~ 0.00 Meg
------------------------------------------------------------
Computation run information :
Start : Fri Oct 30 07:38:40 2009
End : Fri Oct 30 07:39:28 2009
Duration : 48.56 seconds
============================================================
Total computation time : 48.56 seconds (~ 0.01 hours)
============================================================ 还是相信1.5多点....
你这个命令提示符的显示方式不习惯 也不喜欢操作麻烦
回复 3# 天依 的帖子
这不需要相信什么的，我比较过superpi 1.5和pifast4.3算出来的3350万位结果，是一致的。(可以通过同目录下生成的pi.txt查看算出的结果)而且SuperPi的编写年代久远，计算很慢，同样算104万位，superpi要24秒，而pifast4.3只要2.4秒，算出来的结果也是一致的。所以才说superpi效率低...
不知道用SuperPi的人中有几个人知道Pifast，有几个知道Qpi，还有几个人两个都知道的
SuperPi在历史舞台上的地位是永远存在的，但是考验CPU速度，还是换更先进的算法和程序感觉会更好，更能体验飞速的感觉！看着SuperPi的排行榜，我仿佛看到了喷火的跑车发动机装在了拖拉机上...
你真的老了SuperPi...
普及下PI计算的知识：【转】SuperPi的幕后细节 intel 3.5G双核
Program : PiFast version 4.3 (fix 1), by Xavier Gourdon
Computation of 10000000 digits of Pi
Method used : Chudnovsky
Size of FFT : 1024 K
Physical memory used : ~ 61355 K
Disk memory used : ~ 0.00 Meg
------------------------------------------------------------
Computation run information :
Start : Fri Oct 30 10:05:15 2009
End : Fri Oct 30 10:05:38 2009
Duration : 23.00 seconds
============================================================
Total computation time : 23.00 seconds (~ 0.01 hours)
============================================================ 更新PI的50亿位计算，由于数字较大，所以计算分了几段：
☆算PI 50亿位，advanced Disk memory ，32768FFT，计算占用内存1500M，用了232485.54秒(其中Disk memory读写时间86206秒)，算出来的结果有6.51GB大
Program : PiFast version 4.3 (fix 1), by Xavier Gourdon
Computation of 5000000000 digits of Pi
Method used : Chudnovsky
Size of FFT : 32768 K
Physical memory used : ~ 1577920 K
Disk memory used : ~ 21457.67 Meg
------------------------------------------------------------
Computation run information :
Start : Fri Oct 30 22:51:56 2009
End : Sat Oct 31 03:43:11 2009
Duration : 17475.59 seconds
Time spent in disk swapping : 4938 s (reading 2395, writing 2544)
------------------------------------------------------------
Computation run information :
Start : Sat Oct 31 03:56:44 2009
End : Sat Oct 31 10:44:59 2009
Duration : 24495.38 seconds
Time spent in disk swapping : 8769 s (reading 4275, writing 4494)
------------------------------------------------------------
Computation run information :
Start : Sat Oct 31 11:26:37 2009
End : Sat Oct 31 17:57:56 2009
Duration : 23478.77 seconds
Time spent in disk swapping : 8164 s (reading 3979, writing 4185)
------------------------------------------------------------
Computation run information :
Start : Sat Oct 31 19:23:06 2009
End : Mon Nov 02 17:47:02 2009
Duration : 167035.89 seconds
Time spent in disk swapping : 64335 s (reading 34366, writing 29969)
============================================================
Total computation time : 232485.54 seconds (~ 64.58 hours)
============================================================ 30秒啊 我5000+黑的试过
34秒……没OC…… 肥龙2 955 4核@3.6G
Program : PiFast version 4.3 (fix 1), by Xavier Gourdon
Computation of 10000000 digits of Pi
Method used : Chudnovsky
Size of FFT : 1024 K
Physical memory used : ~ 61355 K
Disk memory used : ~ 0.00 Meg
------------------------------------------------------------
Computation run information :
Start : Wed Nov 04 20:22:37 2009
End : Wed Nov 04 20:22:59 2009
Duration : 22.17 seconds
============================================================
Total computation time : 22.17 seconds (~ 0.01 hours)
============================================================
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