DCSR Software Stack
What is it?
The DCSR provides a software environment including commonly used scientific tools and libraries.
The software is optimised to make best use of the CPUs, GPUs and high speed Infiniband interconnect.
In order to create the environment we use the Spack package manager and Lmod.
For information on the deprecated Vital-IT software stack please see here.
Release and lifecycle
Each year we provide a new release of the software stack which fixes versions for key tools and libraries - the new stack is put in production during the annual maintenance in early January and the previous release remains available for one year.
The following table list all the software stacks avaiable:
| Name | Date | Comments |
|---|---|---|
| Arolle | 2022 | SSL library incompatible with OS (after 2025 update) |
| 20240303 | 2024 | |
| 20240704 | 2024 | New stack based on Open MPI |
| 20241118 | 2025 | R is provided by r-light module which uses a container |
Newer versions of tools may be made available during the year but the base versions will remain the default.
How to use it
The latest software stack is loaded by default. You just have to list the module using the 'module' command:
module available
To load a given software:
module load python
If you want to change of software stack you have to use the command: dcsrsoft
dcsrsoft use arolle
Do not forge to do a module purge before changing software stack.
How to use it on jobs
You need to start your jobs with:
#!/bin/bash -l
#SBATCH ...
dcsrsoft use 20241118
You need to put the name of the stack you are using. If you want to know the name of the stack that it is currently used, you can type:
dcsrsoft show
Please keep in mind that old software stack would eventually removed. Therefore, you should migrate your script to the current software stack, if any problem arises please send us a ticket via: helpdesk@unil.ch ( with DCSR on the subject of the mail)
Common problems
SSL problem in old software stacks
If you observe one of the following errors:
ImportError: cannot import name 'HTTPSConnection' from 'http.client'
or
ImportError: cannot import name 'ssl' from 'urllib3.util.ssl_
You should do the following:
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/dcsrsoft/arolle_libs
Before executing your script