Bluecrystal University Of Bristol User Manual

Posted : admin On 12/26/2021
  1. IMP management system user manual v1.0 14 December 2018 7 4 Accessing IMP-Track 4.1 Activating the first user for a new trial The first user on a new trial will be registered and approved by the Bristol Trials Centre. The user will be assigned the role ‘AdminCentre’ (herein referred to.
  2. KOALA User Manual KOALA User Manual Page 1 PROGRAM OVERVIEW The KOALA program is composed of three main parts which are highlighted in the image below: the PROCESS DATA panel, the SPECTRAL DECOMPOSITION panel, and the FIT KINETIC TRACES panel. Each part of the program is composed of a graph accompanied by a sub-panel of controls.
  1. University Of Warwick
  2. Blue Crystal University Of Bristol User Manual Download
  3. University Of Glasgow
  4. University Of Edinburgh

Configuring your computer to connect to eduroam varies depending on which operating system (version of Windows / Mac) you are using. Please choose from the below for instructions:

Alan Turing the now famous World War II code breaker is also the father of artificial intelligence, so it is fitting that the launch of the Intelligent Systems Laboratory at the University of Bristol was marked with a public lecture delivered by Turing’s biographer, Dr Andrew Hodges. Titled, “Alan Turing – Computing for Life“, this first ISL Annual Public Lecture was attended by a.

University Of Warwick

Configure using an automatic setup wizard:Configure using step by step instructions:
  • By connecting to eduroam, you agree to abide by the wireless service regulations.
  • These instructions will only work for users from the University of Bristol. If you are visiting Bristol from a different organisation, you need to refer to your home organisation for instructions.



  • Windows RT(Windows 8 on ARM processor devices)

Phones, tablets, ebook readers, Chromebooks


  • Ubuntu Linux(and other distributions with “NetworkManager”)
  • Linux using wpa_supplicant(including using WICD)

Manual instructions for Windows

Any other devices


For an account on this computer email [email protected] with your UoB username, name of supervisor and preferred login shell (if you have a preference).

For support email [email protected]

Passwords- See this page for information about usernames and passwords on dirac.

Queuing system- dirac uses a queuing system for running jobs. See this page for important information about how it works.

Each year you will have to renew your account on dirac for it to remain open. You will receive an email about this in January each year, please reply to this email stating whether or not you wish your account to remain open.
If/when you leave Bristol, please contact the system administrator and provide a new email address so that you can continue on the dirac email list.

Notice under the Data Protection Act

File storage space is provided on dirac solely for your research data and results. Private files should not be kept on dirac as they are not held confidentially. Access to your files will be provided to members of staff, and to others if the appropriate member of staff requests it.

The System

Dirac is a beowulf cluster, that is, a cluster of computers connected together. The master computer is called the front end, the others are called nodes. There were originally 48 nodes, but due to the age of the system a number are now broken, and the system has now been consolidated to 28 active nodes, numbered node22 - node49. You login to the front end, which is used for compiling, editing files etc, not for running jobs. Run jobs by submitting them to the queuing system, which will distribute them among the nodes.
The operating system is linux.
The users' filestore is backed up nightly with a combination of full and incremental backups. The full backup happens every 2-3 weeks at the weekend and takes two days, so backup frequency is lower on those weekends.

Each node has 2 Xeon P4 1.95GHz processors and 17G of scratch space in the directory /data (/tmp is linked to /data). All nodes have 2Gb of RAM except nodes node42, 48 & 49 which have 4Gb of RAM. Note that this is for the node as a whole, not for each processor.

A user manual has been provided by Compusys and can be downloaded in pdf format. Not everything in this manual is appropriate for dirac.

This is a 32 bit system and there is a normal limit of 2 GB on the maximum size of a single file.

The Front End

Only secure shell connections will be accepted to this computer, and only from systems in the chemistry department. If you wish to access this computer from outside the department, you should first login to grendel, and from there to dirac. X11 tunneled connections can be daisy-chained through grendel (slogin -X dirac).
Dirac's user partitions /home, /home2 and /home3 are cross-mounted onto grendel as /dirac/dirac, /dirac/dirac2 and /dirac/dirac3, so files can be transfered elsewhere from grendel, using these cross-mounts.
Samba connections to dirac can only be made from inside the department.

The front end is for editing files and compiling programs etc. Run jobs by submitting them to the queuing system. Short tests may be carried out on the front end (10-20 mins), anything longer must be submitted to the queuing system. If you do carry out a short test on the front end it MUST be niced at a level of 19.
i.e. to run a program called a.out, use the command
nice -n 19 a.out
Processes running which fail to meet these requirements will be killed.

There are two main shells available, bash (an extension to the Bourne shell) and tcsh (an extension to the C shell). If you wish your login shell changed, contact the system administrator (the user command for this, ypchsh, has a bug).

  • If you use tcsh, the system reads the files /etc/csh.cshrc and then /etc/csh.login and then the files in your home directory .tcshrc (or .cshrc if it is not there) and .login. Edit the files in your home directory to customise your sessions. You can read the system files to see what options have already been set. When writing shell scripts you should note that the -f option does not read .tcshrc, but will read .cshrc if it is there.
  • If you use bash the system reads the files /etc/bashrc and /etc/profile and then the files in your home directory .bash_profile and .bash_login if they exist, or .profile if they do not. Edit the files in your home directory to customise your sessions. You can read the system files to see what options have already been set.
There are a number of user partitions, /home, /home2, etc. Mole is the NIS server for dirac and you will have the same username and password as on mole, but not the same home directory.

When you login you will be shown how much space has been used and how much is available. Read the file Diskuse in /home, /home2, etc to see how much space people are using, and if you see that you are using a large amount, do something about it before the situation gets out of hand.

Blue Crystal University Of Bristol User Manual Download

From the front end you can, if necessary, login to the nodes using the command rlogin node23 (for example).

University Of Glasgow


University Of Edinburgh

  • Some useful utility packages installed on the front end.
  • The queuing system for running jobs on dirac.
  • Programs installed on dirac.