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  • Author Author: clem57
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What are you doing for Pi day? 3.14.15 (US)

clem57

I decided to compare Pi calculations on various SBC's

 

     time echo "scale=2015;4 * a(1)" | bc -l    Thanks

 

First up is X86 (I7 P55 home built):

 

 

real0m2.742s
user0m2.721s
sys0m0.002s
osZorin(ubuntu)
cpuIntelRegistered CoreTm i7 CPU 860 @ 2.80GHz × 8

 

pcDuino 3 :

 

 

real0m15.425s
user0m15.310s
sys0m0.010s
osUbuntu 3.4.79+
cpu

ARMv71 Rev 4

(1 Ghz)

 

Raspberry Pi Model B+ :

 

 

real0m24.225s
user0m24.260s
sys0m0.010s
osPidora 3.12.22
cpu

ARMv6hl.bcm2708

(700 Mhz)

 

Raspberry Pi Model 2 :

 

 

real0m15.536s
user0m15.536s
sys0m0.020s
osRasbian 3.18.7-v7+
cpu

armv7l.BCM2709 Rev 5

(900 Mhz)

 

 

Raspberry Pi Model 2 to find 9,999 digits of Pi:

 

real15m30.628s
user15m29.690s
sys0m0.510s

 

Not bad... Compared to X86!

 

===> More added here 3/16/15:

 

Atmel Sama5d4 :

 

 

real0m23.087s
user0m23.060s
sys0m0.000s
osYocto 3.10.0
cpu

armv7l A5 cortex

(563 Mhz)

 

===> More added here 7/16/16           Note: 2015 digits

 

Pine 64 Kickstarter :

 

 

real0m10.716s
user0m10.530s
sys0m0.000s
osdebianpine64 3.10.65-7-pine64-longsleep
cpu

AArch64 Processor rev 4 (Quad)

(1.2 Ghz)

fp asimd aes pmull sha1 sha2 crc32

 

Raspberry Pi  Model 3:

 

real0m8.073s
user0m8.020s
sys0m0.000s
osraspberrypi 4.4.15-v7+ #897
cpu

ARMv7 Processor rev 4 (v7l) (Quad)

(1.2 Ghz)

half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt vfpd32 lpae evtstrm crc32

 

 

 

 

What do you think?

Attachments:
Pi 9999 digits X86.txt.zip
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  • Former Member
    Former Member

    Yo Clem!  Seriously, an Intel i7 should run circles around an i3. Besides CPU, bus and RAM speed might make a difference.  I suspect that O/S and disk hardware are insignificant.

     

    The i7 mobo make/model?

     

    My home-built box:

    • Mobo: ASRock H67M-ITX/HT Mini-ITX
    • CPU: i3-2100T (64bit, 2.5GHz)
    • RAM: 8GB DDR3 @ 1333
    • SATA: v3 @ 6Gb/sec
    • Chipset: Intel H67
    • O/S: Xubuntu 14.04.2 LTS (up-to-date)
    • Kernel: Linux 3.16.0-33-generic (up-to-date)
  • in reply to Former Member

    The processors are from different generations of the Core family. From what I've read processing power increased by 20-30% every generation. A current i3 can out perform the best first generation i7. And like Clem mentioned, these tests are single threaded so the i7's core advantage is gone. So let's look at the clock speed. The 1st gen turbo boost wasn't all that great, so the clock speed advantage is minimal (probably less than 500 MHz). That makes it 2.5GHz vs 3GHz (with turbo boost). Don't forget to add in the 20-30% increase in power from the second gen i3. Thus making the i3 perform very close or better than the i7.

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  • in reply to Former Member

    The processors are from different generations of the Core family. From what I've read processing power increased by 20-30% every generation. A current i3 can out perform the best first generation i7. And like Clem mentioned, these tests are single threaded so the i7's core advantage is gone. So let's look at the clock speed. The 1st gen turbo boost wasn't all that great, so the clock speed advantage is minimal (probably less than 500 MHz). That makes it 2.5GHz vs 3GHz (with turbo boost). Don't forget to add in the 20-30% increase in power from the second gen i3. Thus making the i3 perform very close or better than the i7.

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