[ExeterLUG] Raspberry Pi Cluster results...

[Paul Sutton]

On 20/12/13 12:37, M Dinsmore wrote:
> I sent this email with some pictures (that Rick requested) on Monday
> but it seems have been over the size limit for the list and has gone
> to moderation!    Anyway, here is the text without the pictures... 
>
> Hi All,
>
> I've finally got some time to write up our results from our cluster
> experiments on Friday Night.  We managed to get 10 raspberry Pies in
> the cluster.
>
> The target was to beat my laptop which ran the monte carlo pi
> calculation method in 4 minutes 50 Seconds.
>
> Our results are as follows
>
> No. of Pies 	Seconds 	
> 	Minutes 	Seconds 	
> 	Percentage Reduction in time taken 	Average Reduction
> 1 	1794.485 	
> 	29 	54 	
> 	
> 	
> 2 	1288.508 	
> 	21 	29 	
> 	28.20% 	28.20%
> 3 	859.134 	
> 	14 	19 	
> 	33.32% 	30.76%
> 4 	644.388 	
> 	10 	44 	
> 	25.00% 	28.84%
> 5 	515.717 	
> 	8 	36 	
> 	19.97% 	26.62%
> 6 	429.622 	
> 	7 	10 	
> 	16.69% 	24.64%
> 7 	368.231 	
> 	6 	8 	
> 	14.29% 	22.91%
> 8 	322.395 	
> 	5 	22 	
> 	12.45% 	21.42%
> 9 	286.442 	
> 	4 	46 	
> 	11.15% 	20.13%
> 10 	257.776 	
> 	4 	18 	
> 	10.01% 	19.01%
>
>
> As you can see we achieved our target of beating my laptop with 9
> raspberry pies.  I guess had the program we ran on the laptop made use
> of both cores the time taken may have been considerably less.
>
> /* I've also attached three screen shots which show the program
> running with 4, 9 and 10 pies in the cluster. */
>
> In the discussions at the end we talked about how it would be possible
> to make the cluster easier to configure. Because the cluster relies on
> a fixed relationship between the IP Address/Hostname and the public
> keys to allow ssh to work seamlessly we needed to run with with static
> IP addresses.  This meant each node had to be manually configured with
> a unique hostname and IP address as it was added to the cluster, this
> hostname/IP address combination then needed to be added to the ssh
> known_hosts file.  It would be better if we could devise a more
> automated method of configuring new nodes - any suggestions are
> welcome.   
>
> We also discussed other applications that we could use a raspberry pi
> cluster for - again suggestions are welcome.
>
> Thanks again for your participation.
>
> Malcolm
>
>
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Thanks malcolm, have put the info on the website
http://dcglug.drogon.net/raspberry-pi-cluster/

Paul




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Exeter Lug meet : 13th December 2013 - http://exeter.lug.org.uk/
Torbay Raspberry Pi Jam 14th December 2013 - http://dcglug.drogon.net/torbay-pi-jam/

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