北京龙芯＆debian用户俱乐部

龙芯2E -700Mhz   （gcc-4.3-1loongson2e)  104万位46秒

p3-750mhz   (gcc-4.3)  104万位  43秒

c3-733mhz   104位 117秒


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在龙芯下计算：

loongson:/usr/src/pi_fftc6# ./pi_cs
Calculation of PI using FFT and AGM, ver. LG1.1.2-MP1.5.2af.memsave
length of FFT =?
200000
initializing...
nfft= 262144
radix= 10000
error_margin= 0.00611182
mem_alloc_size= 9437304
calculating 1048576 digits of PI...
AGM iteration,  time= 3,        chksum= ffffdb4c
precision= 48,  time= 5,        chksum= fffff18d
precision= 80,  time= 8,        chksum= ffffe3e4
precision= 176, time= 10,       chksum= ffffdd72
precision= 352, time= 13,       chksum= ffffd78d
precision= 688, time= 15,       chksum= ffffd47c
precision= 1392,        time= 17,       chksum= ffffd90c
precision= 2784,        time= 20,       chksum= fffff9ad
precision= 5584,        time= 22,       chksum= ffffc2dd
precision= 11168,       time= 25,       chksum= ffffcb7a
precision= 22336,       time= 27,       chksum= ffffe6b3
precision= 44688,       time= 30,       chksum= fffff96d
precision= 89408,       time= 32,       chksum= ffffed75
precision= 178816,      time= 35,       chksum= fffffbe5
precision= 357648,      time= 37,       chksum= ffffe715
precision= 715312,      time= 40,       chksum= fffff393
precision= 1430640,     time= 42,       chksum= ffffe44b
writing pi.dat...
Total 46 sec. (real time),      chksum= 3f99

＝cpuinfo=================================
loongson:/usr/src/pi_fftc6# cat  /proc/cpuinfo
system type             : lemote-fulong
processor               : 0
cpu model               : ICT Loongson-2 V0.2  FPU V0.1
BogoMIPS                : 465.92
wait instruction        : no
microsecond timers      : yes
tlb_entries             : 64
extra interrupt vector  : no
hardware watchpoint     : no
ASEs implemented        :
shadow register sets    : 1
VCED exceptions         : not available
VCEI exceptions         : not available


==P3-750=================================
route:/usr/src/pi# ./pi_cs
Calculation of PI using FFT and AGM, ver. LG1.1.2-MP1.5.2af.memsave
length of FFT =?
200000
initializing...
nfft= 262144
radix= 10000
error_margin= 0.00460421
mem_alloc_size= 9437304
calculating 1048576 digits of PI...
AGM iteration,  time= 3,        chksum= ffffdb4c
precision= 48,  time= 5,        chksum= fffff18d
precision= 80,  time= 7,        chksum= ffffe3e4
precision= 176, time= 9,        chksum= ffffdd72
precision= 352, time= 12,       chksum= ffffd78d
precision= 688, time= 15,       chksum= ffffd47c
precision= 1392,        time= 17,       chksum= ffffd90c
precision= 2784,        time= 20,       chksum= fffff9ad
precision= 5584,        time= 22,       chksum= ffffc2dd
precision= 11168,       time= 24,       chksum= ffffcb7a
precision= 22336,       time= 26,       chksum= ffffe6b3
precision= 44688,       time= 29,       chksum= fffff96d
precision= 89408,       time= 31,       chksum= ffffed75
precision= 178816,      time= 33,       chksum= fffffbe5
precision= 357648,      time= 36,       chksum= ffffe715
precision= 715312,      time= 38,       chksum= fffff393
precision= 1430640,     time= 40,       chksum= ffffe44b
writing pi.dat...
Total 43 sec. (real time),      chksum= 3f99

===P3-750 cpuinfo===================
route:/usr/src/pi# cat  /proc/cpuinfo
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 8
model name      : Pentium III (Coppermine)
stepping        : 6
cpu MHz         : 751.745
cache size      : 256 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 2
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov pat pse36 mmx fxsr sse up
bogomips        : 1504.64
clflush size    : 32

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v3-733cpu

jn_files:~# ./pi_cs
Calculation of PI using FFT and AGM, ver. LG1.1.2-MP1.5.2af.memsave
length of FFT =?
200000
initializing...
nfft= 262144
radix= 10000
error_margin= 0.00460421
mem_alloc_size= 9437304
calculating 1048576 digits of PI...
AGM iteration,  time= 8,        chksum= ffffdb4c
precision= 48,  time= 14,       chksum= fffff18d
precision= 80,  time= 19,       chksum= ffffe3e4
precision= 176, time= 27,       chksum= ffffdd72
precision= 352, time= 33,       chksum= ffffd78d
precision= 688, time= 39,       chksum= ffffd47c
precision= 1392,        time= 45,       chksum= ffffd90c
precision= 2784,        time= 52,       chksum= fffff9ad
precision= 5584,        time= 58,       chksum= ffffc2dd
precision= 11168,       time= 64,       chksum= ffffcb7a
precision= 22336,       time= 71,       chksum= ffffe6b3
precision= 44688,       time= 77,       chksum= fffff96d
precision= 89408,       time= 83,       chksum= ffffed75
precision= 178816,      time= 89,       chksum= fffffbe5
precision= 357648,      time= 96,       chksum= ffffe715
precision= 715312,      time= 102,      chksum= fffff393
precision= 1430640,     time= 108,      chksum= ffffe44b
writing pi.dat...
Total 117 sec. (real time),     chksum= 3f99

＝＝＝cpuinfo============

jn_files:~# cat /proc/cpuinfo
processor       : 0
vendor_id       : CentaurHauls
cpu family      : 6
model           : 7
model name      : VIA Samuel 2
stepping        : 3
cpu MHz         : 733.406
cache size      : 64 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 1
wp              : yes
flags           : fpu de tsc msr cx8 mtrr pge mmx 3dnow
bogomips        : 1468.31