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 Raspberry Pi, Rm100 computer that beats iPhone4S

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wcypierre
post Feb 22 2015, 01:39 PM

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QUOTE(alucard89 @ Feb 22 2015, 01:34 PM)
Got no overheating problem with RPI? Or do you place it near a fan or something
I saw some casing that provides heatsink as well
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I do place heatsink on one of my rpi which does the torrent downloading. The others are just for media streaming. I'm planning to build a diy cooling system for my rpis and desktop but I guess it will have to wait after cny
wcypierre
post Feb 25 2015, 10:11 AM

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QUOTE(alucard89 @ Feb 25 2015, 07:12 AM)
Will have to check how to place those heatsinks, are you using those private trackers for torrent?
I don't use torrent much anymore, mostly just direct downloads using alldebrid account
Tried using pyload for openelec, but not getting max speed and unstable download speed.
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Torrent is more reliable than http/ftp download actually, although it taxes your sdcard alot, as well as uses a lot of your cpu power(can't do anything else when my deluge is running)
wcypierre
post Mar 7 2015, 11:21 PM

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QUOTE(wsian @ Mar 6 2015, 11:18 PM)
Other than raspberrypi, we have now bananapi, orangepi,  biggrin.gif

If you want to build a headless server with bananapi, I'd like to recommend you the debian image from here:
http://www.igorpecovnik.com/2014/09/07/ban...ebian-sd-image/
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didn't know about orange pi before you posted it laugh.gif The amount of components that is built in into it is drool.gif
wcypierre
post May 17 2015, 11:59 PM

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QUOTE(HMMaster @ Mar 18 2015, 10:52 PM)
Any good power supply/charger to recommend for raspberry pi?
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Just get a decent charger that can provide 2A of power supply reliably. Go for those phone chargers where the phone supports 2A(like Note 3 and etc)
wcypierre
post May 18 2015, 12:01 AM

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QUOTE(HwangTommy @ May 17 2015, 07:29 PM)
im not sure but I assume its public IP. I already used No-IP.
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Maxis uses private ip so that is not a choice even with No-IP.
wcypierre
post May 20 2015, 10:56 AM

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anyone here runs their raspi 24/7? just curious of what cooling solutions that you guys are currently using biggrin.gif
wcypierre
post May 20 2015, 08:29 PM

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QUOTE(buyoq @ May 20 2015, 11:00 AM)
Both of my PI run 24/7. One is on Raspbian and another runs OpenElec.passive/air cooling.didnt even bother coz the SOC used are almost the same one that are used on mobile phones.it can stand the heat perfectlly.
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QUOTE(zaidi @ May 20 2015, 03:34 PM)
I'm using it for vpn server to access at home. basically no cooling required smile.gif

uptime 37 days. i think i'd been running it for over 3 months. just hung twice if i'm not mistaken
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okay. Just curious on what do you guys use. anyway, I used to run it without cooling until recently where I put heatsinks on the processor. And the heatsink is damn hot sweat.gif

This post has been edited by wcypierre: May 21 2015, 07:00 PM
wcypierre
post May 21 2015, 04:09 AM

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QUOTE(sky03 @ May 20 2015, 09:38 PM)
anyone here hav idea how to load balancing network raspi as router? i saw youtube some guy did it but no tutorial watsoever... google it too but in vain... btw the guy make his raspi router to connect multiple access point n some how it does improve bandwidth n speed overall... i wonder how he did it... really interesting
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If you don't have more than 1 internet connection then you can pretty much forget about it. It is for those with multiple internet(WAN). Like you have one line with Maxis and one line with Unifi. Then you can aggregate(combine) the bandwidth(bonding) for better speed or load balance the bandwidth for fair share, depending on what settings that you wanted to use. Typically these kind of features are only available on mid-high end routers. But since routers are also devices running Linux, so raspi can do it as well. Even your computer can do it too if you install Linux on it and buy some extra network card. For the sake of testing, you can put your 3g dongle, or yes's 4g dongle to test it, but with the limited quota, I don't think you will want to do so.

You can use the link below, commands on Debian should work without issue as Raspbian is Debian based.
https://www.google.com/webhp?sourceid=chrom...+load+balancing
wcypierre
post May 24 2015, 03:58 AM

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QUOTE(MrLoo @ May 23 2015, 11:13 PM)
I HAVE GOT ALOT TO LEARN FROM SIFUS HERE...

BTW, what type of usb wifi adapter u use bro? those with anthenna?
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you have two options, which I think are more suitable(easy setup and best performance) depending on your usecase.

If you are the only one using the raspi, put your raspi at your room and buy a raspi compatible wifi adapter(literally plug and play instead of having to configure it) and plug a lan cable to your desktop/switch. Whether you need antenna or not depends on your distance of your raspi with your router.

If you need to share the services(movies, torrent, file sharing and etc) with other family members, then just buy a lan cable and plug it to your router.
wcypierre
post May 26 2015, 01:34 PM

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QUOTE(MrLoo @ May 25 2015, 05:38 PM)
Thanks for your guidance.  biggrin.gif
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If you're going to get a usb wifi adapter, you may need to get a usb powered hub(you need to check on the internet to see if it can be powered from raspi's usb power alone or not). If you're using TP Link 727N, or any MT7601 based usb wifi adapter, you can use the command below

NOTE: for Raspi B, B+ only

CODE

rpi-update 4e2845e0cbe7e701f0431e66a26f730de264e7a6

wget https://dl.dropboxusercontent.com/u/80256631/mt7601-3.18.11-777.tar.gz
tar xzf mt7601-3.18.11-777.tar.gz
./install.sh

wcypierre
post May 26 2015, 03:07 PM

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QUOTE(MrLoo @ May 26 2015, 01:53 PM)
I purchased one from pier electronic. It is useable for raspberry pi as I read the description... Plug and play yo smile.gif
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icon_rolleyes.gif It is better for you to get a plug and play one, getting my wifi adapter to work whenever I upgrade my kernel is rclxub.gif
wcypierre
post May 27 2015, 06:20 AM

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QUOTE(MrLoo @ May 27 2015, 01:21 AM)
Pierre. Is there any intro for a webcam? I wanna make a cctv out of it. Tq
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nope. typically I use usb ones because I need to record something for fun. But if you wanted something more serious, then I don't know much about it. Probably you can survey around garage sales?
wcypierre
post May 29 2015, 03:16 AM

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QUOTE(MrLoo @ May 29 2015, 02:20 AM)
is there any brand of webcam plug n play for pi? rclxms.gif
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I've tried Logitech before(idk what model is it) and it works out of the box.

UPDATE: I've just tried my unbranded webcam that I bought from taobao and it works too laugh.gif

This post has been edited by wcypierre: May 29 2015, 03:20 AM
wcypierre
post May 29 2015, 12:38 PM

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QUOTE(alucard89 @ May 29 2015, 07:45 AM)
Mind sharing how you configure it?
Motion sensor and everything else works fine?
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I didn't tap into that as my webcam is just a webcam, not those cctv type
wcypierre
post Aug 5 2015, 11:36 AM

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QUOTE(sin2010 @ Aug 4 2015, 05:40 PM)
Tried before...and it is no problem to get ip when connect it to router, so maybe osx side need to set something?but so far i only can check the internet sharing, nothing much i can do.
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OSX should have an Internet sharing feature like Windows and Linux w/ GUI where the DHCP Server is automatically run when u enable internet sharing. Otherwise, u can install a 3rd party dhcp server and give ip to ur raspi laugh.gif
wcypierre
post Aug 5 2015, 11:39 AM

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QUOTE(quadcube @ Jul 3 2015, 09:17 AM)
There are a lot of C based MPI program on the net,tested Prime number program,useful for up to 19 threads only laugh.gif
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Try and run your parallel program and run top. Look for wa and if it is high then IO is the issue in your setup(I guess IO should be the main issue for distributed or parallel for nodes in the same network)
wcypierre
post Aug 5 2015, 05:08 PM

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QUOTE(sin2010 @ Aug 5 2015, 04:31 PM)
Any suggested  good 3rd party dhcp server?
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le me not OSX user.

Anyway, plug ur raspi back to your router and edit this file: /etc/network/interfaces

CODE

auto lo
iface lo inet loopback

#My IP description
# IPv4 address
iface eth0 inet static
address 10.10.10.10
netmask 255.255.255.0


At your mac, set the ip of your ethernet interface(lan) to
ip: 10.10.10.11
netmask: 255.255.255.0

Plug your raspi to ur mac and access ur raspi via 10.10.10.10
wcypierre
post Aug 5 2015, 08:27 PM

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QUOTE(sin2010 @ Aug 5 2015, 08:13 PM)
the eth0 for rpi is set to dhcp.. i hvae tried to plug it in router, it can get ip form router... no sure why OSX is not working.
it that any special by setting to 10.10.10.10?
i have tried to set static on Rpi and OSX before, it worked, can ssh into RPi form OSX, but the problems was: Rpi cannot access internet via wifi any more.

My purpose connecting OSX to Rpi via LAN is for the case whne i cant access the internet ( when i bring it to some place which i do not have the wifi password), i got an other way to connect it, which is LAN for this case.
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no, as well as you put a private ip that is not used by any devices at your network then it will be okay (i.e 192.168.x.x)
replace x with any number from 2 - 253.

Anyway, the above is just for additional knowledge laugh.gif

Do the "2. Set up the client" where you will set Using DHCP for configuring IPv4 and it should work. Set back your raspi to use dhcp if you've changed it to static ip previously.
http://www.maclife.com/article/howtos/how_...ection_ethernet

Try and see if it works. I don't have a Mac so can't try it out personally

This post has been edited by wcypierre: Aug 5 2015, 08:28 PM
wcypierre
post Aug 5 2015, 08:41 PM

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QUOTE(quadcube @ Aug 5 2015, 12:59 PM)
I don't have access to the cluster currently,on holiday laugh.gif

but i made a no. thread vs time taken graph for two program

[attachmentid=4694830]
- MPI Prime number program

[attachmentid=4694841]
-MPI 2D Poisson equation using Jacobi algorithm

by right the performance graph should decrease exponentially,but the Prime number program doesn't perform as expected,as u mentioned,most probably caused by high IO

for the 2D Poisson equation using Jacobi algorithm,initially i set the no. of interior vertices and fractional accuracy for the program to complete faster,which almost the same graph as the prime program.
so i change the no. of interior vertices and fractional accuracy to be higher,which increase the required computing power for each Pi to get the exponential decrease graph,which indicates that the IO latency have become insignificant
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for your 2nd one, when you wanted more accuracy, everything takes a longer time to complete. but eventually as you add more nodes your issue should still be on IO, because as you can see from the prime num test, when the requests is faster, the possibility of each node sending data back to the server at the same time is higher, so if your server node still runs on sd card, or even worse usb thumb drive(for storage of data), you should consider using a normal computer(desktop/laptop) or at least run raspi with HDD as the server node to solve the io issue and you should see a better result.

btw, you should plot it with nodes/time taken, because let's say you have 6 threads, I don't know if you're giving node 1 and spawn 5 threads and node 2 spawn 1 thread or node 1 2 threads, node 2 2 threads, node 3 2 threads, and the combination etc.

I believe this is some academic research stuff for uni/company? brows.gif

This post has been edited by wcypierre: Aug 5 2015, 08:44 PM
wcypierre
post Nov 26 2015, 08:47 PM

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