Distributed Computing

Distributed computing technology breaks a problem into parallel tasks running on two or more computers. With the convergence of low-cost processors and high speed networks, computer clusters have emerged as an affordable solution to do-it-yourself distributed computing and high-availability. Multiple miniature computers are connected to perform distributed computing.

Raspberry Pi Organization (raspberrypi.org) offers a pocket-sized single-board computer for approximately $35 USD. Several versions of the free Linux operating system are available for the Raspberry Pi.

For each computer, static IP addresses are assigned.

cat /etc/network/interfaces
iface eth0 inet dhcp
sudo ifconfig

Make note of the inet addr, bcast, and mask.
sudo route -nee

Make note of the gateway address.

Interfaces file can be updated to set static information with nano.

sudo nano /etc/network/interfaces

Delete ""iface eth0 inet dhcp" and add the following:

iface eth0 inet static
address 192.168.1.???

*??? placeholder for number you select

Ctrl+X, then Y to save.

Example of IP addresses for 4 computers:

With static IP addresses configured, the University of Cambridge hosts a tutorial on computation between 2 computers. Python source code included: Distributed Computing Demo (Cambridge)

Each computer requires MergeSort.py and Merge1.py. The host machine will have MergeServer.py and the client machine will have MergeClient.py. When tested, the following results were returned: 10 seconds vs. 7.87 seconds.

Raspberry Pi computer communicating through FM radio

1. Configure Raspberry Pi computer.

2. Download and install the computer talker program "festival" with command:
sudo apt-get install festival

3. Once downloaded and installed, plug in a speaker to your Raspberry Pi computer and enter the command to hear your computer talk:
echo "computer is talking." | festival --tts

4. Save the message as a WAV file with the command:
echo talk | text2wave >op.wav

5. Install FFMPEG with the command
sudo apt-get install ffmpeg

6. Convert the op.wav file to 22050kHz with the command:
ffmpeg -i "op.wav" -y -ar 22050 "op.wav"

7. Install PiFM to get your computer to send messages over the radio with the following commands:
wget http://omattos.com/pifm.tar.gz

Once downloaded, extract with this command:
tar -xvzf pifm.tar.gz

8. Tune a radio to 88.1 FM and execute the following command:
sudo ./pifm op.wav 88.1

Results are transmitted to your FM radio to frequency 88.1.

Copyright Oproot Research. All rights reserved.
Permission is granted for limited, non-commercial use of text and images. If used, please credit and notify Oproot Research. If circumstances permit, please include the URL: http://oproot.com. Oproot Research would appreciate a copy of publication. High-resolution images are also available. Please email requests, comments to tech@oproot.com.



  P.O. Box 235
  Hondo TX 78861
  email: code@oproot.com