Rasmurtech Blog

Here you will learn how to create a Raspberry Pi 3 Cluster (Supercomputer). This tutorial will work for all the other Raspberry Pi’s.

Parts

Raspberry Pi 3 (2 or more) http://goo.gl/isdLQQ
Network Switch or Router http://goo.gl/Ds5csd
USB Powered Hub
Micro USB Cable (same as Pi’s you have) http://goo.gl/w8DT6V
MicroSD Card 8GB or More (same as Pi’s you have) http://goo.gl/21Sro2
RJ45 CAT 5e Cable (same as Pi’s you have) http://goo.gl/dEOOLc
GeauxRobot Raspberry Pi B, 2 and 3 Stackable Case: http://goo.gl/F1LAc8

Installing Raspbian

Download the Raspbian Image: https://goo.gl/64dNnN
Download and install Win32 Disk Imager: https://goo.gl/SgwAjN
Burn the Raspbian Image to the MicroSD Card using Win32 Disk Imager
Connect the MicroSD Card(with Raspbian burned on it) to the Raspberry Pi 3
Connect a Network Cable from the Raspberry Pi 3 to your router(Same router your PC is connected to)
Connect a Micro USB cable from the Raspberry Pi 3 to a power source.
Download PuTTY: http://goo.gl/4jcu69
Open up Command Prompt (Type cmd in the search)
Type “ping raspberrypi ” and hit enter (Write down your Pi’s IP Address)
Open up PuTTY and type the Pi’s IP Address and click open
login: pi Password: raspbian (Hit Enter)
type “sudo raspi-config“ and hit enter
Expand the File System
Advanced Options
Set the Hostname to Pi01
Split the memory
Enable SSH
Finish the configuration

Installing MPICH

sudo apt-get update
sudo mkdir mpich2
cd ~/mpich2
sudo wget http://www.mpich.org/static/downloads/3.2/mpich-3.2.tar.gz
sudo tar xfz mpich-3.2.tar.gz
sudo mkdir /home/rpimpi/
sudo mkdir /home/rpimpi/mpi-install
mkdir /home/pi/mpi-build
sudo apt-get install gfortran
sudo /home/pi/mpich2/mpich-3.2/configure -prefix=/home/rpimpi/mpi-install
sudo make
sudo make install
cd ..
nano .bashrc

PATH=$PATH:/home/rpimpi/mpi-install/bin (Paste to bottom of file, then hold CTRL press “6” “x” let go of CTRL press “y” “enter”)

sudo reboot
mpiexec -n 1 hostname

Installing MPI4PY

wget https://bitbucket.org/mpi4py/mpi4py/downloads/mpi4py-2.0.0.tar.gz
sudo tar -zxf mpi4py-2.0.0.tar.gz
cd mpi4py-2.0.0
sudo aptitude install python-dev
python setup.py build
sudo python setup.py install
export PYTHONPATH=/home/pi/mpi4py-2.0.0
mpiexec -n 5 python demo/helloworld.py

Install nmap

sudo apt-get update
Sudo apt-get install nmap

Get current IP

ifconfig

Scan subnet for Pi’s

sudo nmap -sn 192.168.1.*

Change Pi’s Name (Do this step for Pi02,Pi03,Pi04)

ssh pi@192.168.1.2 (Pi01,Pi02,Pi03,Pi04 IP Address)
Password: raspberry
sudo raspi-config
- Scroll down to Advanced hit Enter
- Scroll down to Hostname hit Enter
- Change the name (Pi01,Pi02,Pi03,Pi04) Hit Enter
- Press Tab until Finish is selected then hit Enter

Edit Machinefile

nano machinefile
- 192.168.1.1
- 192.168.1.2
- 192.168.1.3
- 192.168.1.4

Hold CTRL Press 6 x Press y Hit Enter

Text Machinefile

mpiexec -n 1 hostname
mpiexec -f machinefile -n 4 hostname

Add keys to all pi’s

Pi01

ssh-keygen
cd ~
cd .ssh
cp id_rsa.pub Pi01

Pi02

ssh pi@192.168.1.2
ssh-keygen
cd .ssh
cp id_rsa.pub Pi02
scp 192.168.1.1:/home/pi/.ssh/Pi01 .
cat Pi01 >> authorized_keys
exit

Pi03

ssh pi@192.168.1.3
ssh-keygen
cd .ssh
cp id_rsa.pub Pi03
scp 192.168.1.1:/home/pi/.ssh/Pi01 .
cat Pi01 >> authorized_keys
exit

Pi04

ssh pi@192.168.1.4
ssh-keygen
cd .ssh
cp id_rsa.pub Pi04
scp 192.168.1.1:/home/pi/.ssh/Pi01 .
cat Pi01 >> authorized_keys
exit

Pi01 (Do this For All Pi’s)

scp 192.168.1.2:/home/pi/.ssh/Pi02 .
cat Pi02 >> authorized_keys

scp 192.168.1.3:/home/pi/.ssh/Pi03 .
cat Pi03 >> authorized_keys

scp 192.168.1.4:/home/pi/.ssh/Pi04 .
cat Pi04 >> authorized_keys

Run new machinefile

cd ~
mpiexec -f machinefile -n 4 hostname

Run Python Code on Cluster

scp -r test5.py 192.168.1.166:/home/pi
mpiexec -f machinefile -n 5 python test5.py

Sample Python Code

——————————————————————————–

def is_prime(n):
        status = True
        if n < 2:
            status = False
        else:
            for i in range(2,n):
                if n % i == 0:
                    status = False
        return status
for n in range(1,101):
    if is_prime(n):
        if n==97:
            print n
        else:
            print n,",",

———————————————————————————-

Raspberry Pi 3 Cluster (Supercomputer)