5. Creating a Common User for All Nodes | Build Supercomputers with Raspberry Pi 3

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Build Supercomputers with Raspberry Pi 3

By : Carlos R. Morrison

4.3 (7)

Build Supercomputers with Raspberry Pi 3

4.3 (7)

By: Carlos R. Morrison

Overview of this book

Author Carlos R. Morrison (Staff Scientist, NASA) will empower the uninitiated reader to quickly assemble and operate a Pi3 supercomputer in the shortest possible time. The lifeblood of a supercomputer, the MPI code, is introduced early, and sample MPI code provides additional practice opportunities for you to test the effectiveness of your creation. You will learn how to configure various nodes and switches so that they can effectively communicate with each other. By the end of this book, you will have successfully built a supercomputer and the various applications related to it.

Preface

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Free Chapter

1. Getting Started with Supercomputing

1. Getting Started with Supercomputing

Von Neumann architecture

Flynn's classical taxonomy

Historical perspective

The need for greater processing speed

Additional analytical perspective

Sources for reference

Summary

2. One Node Supercomputing

2. One Node Supercomputing

Linux installation

PC processor

Accessing processor technical details

Write/run serial π code

Message passing interface

Summary

3. Preparing the Initial Two Nodes

3. Preparing the Initial Two Nodes

Listing of parts

The Pi2/Pi3 computer

Project overview

Super stack assembly

Preparing the master node

Transferring the code

Preparing the slave node

Summary

4. Static IP Address and Hosts File Setup

4. Static IP Address and Hosts File Setup

Configuring static IP address of the master Pi

Configuring a network switch static IP address

Hosts file setup

Summary

5. Creating a Common User for All Nodes

5. Creating a Common User for All Nodes

Adding a new user for all nodes

ID key generation

ID key transfer

Summary

6. Creating a Mountable Drive on the Master Node

6. Creating a Mountable Drive on the Master Node

Summary

7. Configuring the Eight Nodes

7. Configuring the Eight Nodes

Automating mounting of drives

Setting up the host file for all nodes

Formatting the remaining slave SD cards

Copying the slave1 SD card image to the main computer drive

Copying the slave1 image to the remaining slave SD cards

Summary

8. Testing the Super Cluster

8. Testing the Super Cluster

Wielding the -H command

Pi2 supercomputing

Pi3 supercomputing

Creating bash files

Using unrestrained MPI code logic

Summary

9. Real-World Math Application

9. Real-World Math Application

MPI Taylor series sine(x) function

MPI Taylor series cosine(x) function

MPI Taylor series tan(x) function

MPI Taylor series ln(x) function

Summary

10. Real-World Physics Application

10. Real-World Physics Application

MPI concurrent wave equation and code

Summary

11. Real-World Engineering Application

11. Real-World Engineering Application

MPI Fourier series sawtooth signal

Summary

A. Appendix

A. Appendix

Definitions

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ID key transfer

Enter the command ssh-copy-id alpha@Slv1; alpha is the username that will receive the key, and Slv1 is the host which it belongs to. Enter the password for Slv1 (see the highlighted commands in the following screenshot):

Oops! Entered the incorrect password. That's it! You have transferred the key. Now ssh into Slv1. It's now asking for a passphrase instead of a password; see the following screenshot. Enter the passphrase you provided earlier. This is great!

Now ssh back into Mst0, and list the files in the alpha user by entering ls -la. We can see the .ssh folder. Go ahead and list the files in the .ssh folder (see the following screenshot):

We now see the authorized keys id_rsa, id_rsa.pub, known_hosts. Now ssh into the Slv1 node:

We see that it is asking for a passphrase. This is not what we are looking for, so we still must make a few changes to our master node. Enter the passphrase, and enter exit. You should now have returned to the master node, pi@Mst0:~ $. If you...

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