27 March 2020

DAS-4/VU and DAS-4/Delft have been decommisioned. The role of for password updates has been taken over by For access to old data on DAS-4/VU or DAS-4/Delft, mail

5 April 2018

OpenNebula on DAS-4/VU and DAS-4/Delft has been updated to version 5.4.6.

4 April 2018

The DAS-4 clusters have been updated to CentOS 7, and the Nvidia CUDA development kit has been updated to version 8.0 (version 9.1 is also available for recent GPUs). This update makes DAS-4 software-compatible with DAS-5.

6 Jul 2015

DAS-5 is now fully operational! To make room for DAS-5, DAS-4/UvA and DAS-4/ASTRON have been decomissioned, only their headnodes remain available.

Xeon Phi

DAS-4 contains a small number of nodes with Intel Xeon Phi accelerator (see Special Nodes) which can be programmed using various paradigms and computation offloading methods, including OpenCL and OpenMP.

For OpenCL support, the opencl-intel module can be used, as documented on the DAS-4 GPU page. For most other approaches to use the Xeon Phi (also referred to as MIC), we refer to the extensive documentation provided by Intel.

Several programming models require use of a special Intel compiler, e.g., to support the Xeon Phi computer architecture itself, to implement pragma based auto-parallelization techniques (OpenMP) or other approaches to parallelization (e.g., TBB, Cilk). The latest Intel compiler set (release 13.3/2013.3.163) supporting the Xeon Phi can be added to your environment on DAS-4 as follows:

$ module load intel/compiler/64/13.3/2013.3.163

This command is also required for setting up the environment such that offloading to the Xeon Phi works correctly. The same command should be put in your job script, as explained in the DAS-4 jobs documentation.