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1,110 bytes added, 13:22, 28 March 2019
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= Octave on Public Clouds =
For This description is for installing the latest released stable version of Octave version and running it on instances on public clouds such as Amazon AWS. The user interacts with a desktop client which connects to the servers running octave over a secure internet connection.  Users often want to preserve code portability between desktop and the servers. Moreover, users may want to preserve the desktop interaction experience.  On Amazon AWS EC2, spot instances (and preemptible VMs on GC) permit use of powerful machines for short periods of time. Many octave computations run much faster on multicore machines. In addition, embarrassing parallelism can be easily exploited using octave packages such as parallel. Because of network latency over the internet, user interaction that relies on sub milli-second response latency of a desktop does not work well.  This requires some changes to the standard desktop user interaction model, relying more on the faster local client response. Jupyter notebook is an example of such an interface.  
== AWS EC2 ==
=== Ubuntu ===
Installation of octave from source on Ubuntu LTS images published by Ubuntu is described first.
On AWS EC2, choose the official Ubuntu AMI for EC2 for your region. See [ Ubuntu cloud image locator]
=== Installing on Ubuntu LTS 16.04 LTS ===
sudo apt update
sudo apt install build-essential
=== Installing on Ubuntu LTS 18.04 LTS ===
== Connecting to the cloud instance ==
If you are using X-11 for plotting in octave (gnuplot xterm), you will need to do X-11 forwarding using ssh -Y . You will also need Xquartz installed on your machine and issue xhost + <your instance public IPV4 address>
For qt graphics, you do not need the X-11 forwarding.
Because of network latency between the remote cloud server and the local client, response to user keystrokes is delayed. Running an octave kernel in Jupyter notebook avoids this because the local browser responds to keystrokes during editing.
This description only addresses single user Jupyter notebook server not the multi-user Jupyter Hub server.


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