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Login node

202.38.87.39

The login node should be not used for computing.

Compute nodes

servers list	public IP:ssh/xrdp port	private IP	cores/RAM
debian1	202.38.87.190:34/35	192.168.211.76	128/512GB
debian2	202.38.87.190:91/--	192.168.211.106	128/512GB
debian3	202.38.87.190:92/93	192.168.211.107	128/512GB

ubuntu22

202.38.87.190:--/94

192.168.211.54

i7-12700/64GB

debian1 is mainly used for post processing. Storage directories on debian2/3 and ubuntu22 can also be accessed from debian 1. The mapping relation is

ubuntu22:/StorageNektar -> debian1:/storage/ubuntuData1

ubuntu22:/StorageLBM    -> debian1:/storage/ubuntuData2

debian2:/home2               -> debian1:/storage/debian2home2

debian2:/home3               -> debian1:/storage/debian2home3

debian3:/home2               -> debian1:/storage/debian3home2

debian3:/home3               -> debian1:/storage/debian3home3

Nodes are equipped with different numbers of processing cores. Use lscpu to find out about the number of logical cores ("CPU(s)"). These will show up as 256 cores, but this refers to hardware threads and two hardware threads will share an arithmetic unit on the CPU. Therefore, for compute intensive tasks, 256 cores will not provide twice the compute capacity of 128 cores. Please be conscious of other users on the system and check if the node is already in use (using top before running compute-intensive jobs.

Access

Access is via SSH or RDP (only for debian1). Allocation of compute nodes to specific users is currently entirely informal.

SSH access

To login via SSH you need to log into the login node first 

ssh username@202.38.87.39

From the login node, you can log into other nodes, for example to debian 1

ssh -p 34  username@202.38.87.190

RDP access

For users who prefer (or need) a graphical environment, such a desktop can be accessed using the standard remote desktop protocol (as used by Windows Remote Desktop).

First, you need to creat to tunnel in the powershell or other types of shell

ssh -L6666:202.38.87.190:35   username@202.38.87.39

Then, log into the port 6666 using any remote destop software,

When logging out, please select the Logout option. DO NOT select shutdown or restart, for obvious reasons!

If you close the remote desktop viewer on your local computer without selecting Logout, your session will continue running. Connecting as normal will reconnect you to your existing session.

Sessions which have been idle for 14 days or more will be automatically terminated to free resources for other users.

Changing your password

Once you have logged into one of the compute nodes you can change your password by running the passwd command from a terminal. You will be prompted to enter your old password first and then supply a new password. The new password must:

• Be non-trivially different from your old password

• Contain characters from at least three of the character groups: lowercase letters, uppercase letters, numbers, symbols. Uppercase letters at the beginning and numbers at the end do not count!

• Be at least 8 characters long

Available Software

Some standard and non-standard software is provided as modules which can be loaded by the user. For instance the Boost libraries and Matlab are available as modules. Here are some useful commands:

• List available modules: module avail

• Load a module: module load module-name

• Unload a module: module unload module-name

• Show loaded modules: module list

Matlab

To run Matlab in the graphical environment:

1. Open a terminal

2. Load the Matlab module: module load matlab

3. Run matlab: matlab

Storage

Here are some useful commands:

• du -sh - check how much space the current directory occupies

• df -h - check how much space is left on shared and local storage