Introduction to Trifid

Your Trifid environment will automatically be established during your initial login. See the tutorials for logging on and transferring files.

Trifid reflects an updated Tango user environment, with a few notable exceptions.

File Systems and Storage

A new feature available on Trifid is a Lustre file system on a high performance DDN storage array. Please refer to the lustre file system page for further information.

On Tango files are normally stored on /home.

On Trifid the /home file system, shared with Tango, should be used for scripts, source code, and executables. The /lustre file system is for working storage during live projects.

Note that “parking data” and long term storage is not authorised on VPAC storage systems.

VPAC backup procedures protect against equipment failure not user errors, and you should maintain copies of “important” data at your institution.

Software Applications

Both Trifid and Tango have a broad range of applications with more being installed on Trifid throughout a transition period and beyond. Please request new applications software through the VPAC Help Desk.

Memory Exceeded

Trifid now generates messages when users use more RAM than they request. e.g.: job 6449 exceeded MEM usage hard limit.

Jobs that use an excessive amount of memory over the amount they asked for will be killed by the system to prevent memory overruns for harming other jobs and the nodes they run on. You can request additional memory by adding "#PBS -l pmem=###MB" to your pbs file, This is not in addition to the default, but replaces it.