Piz Daint

The hybrid Cray XC50/XC40 Piz Daint is accessible via ssh from the frontend ela.cscs.ch as daint.cscs.ch.

The operating system on the login nodes is SUSE SLES 12.0: direct access to the compute nodes is not allowed, to run jobs you need to use the SLURM batch queueing system (see RUNNING JOBS).


Model Cray XC50/XC40
XC50 Compute Nodes Intel® Xeon® E5-2690 v3 @ 2.60GHz (12 cores, 64GB RAM) and NVIDIA® Tesla® P100 16GB (daint-gpu)
XC40 Compute Nodes Intel® Xeon® E5-2695 v4 @ 2.10GHz (2 x 18 cores, 64/128 GB RAM) (daint-mc)
Login Nodes Intel® Xeon® CPU E5-2650 v3 @ 2.30GHz (10 cores, 256 GB RAM)
Interconnect Configuration Aries routing and communications ASIC, and Dragonfly network topology
Scratch capacity /scratch/snx3000 6.2 PB

Programming Environment

The software environment on Piz Daint is controlled using the modules framework, which gives an easy and flexible mechanism to access compilers, tools and applications.

Each programming environment loads the local MPI library. Available programming environments are Cray, GNU, Intel and PGI. You can get information on a specific module using the following commands (in the example below, change <module> with the module name):

$ module avail <module>
$ module show <module>
$ module help <module>

Please follow this link for more details on compiling and optimizing your code.


The system has Aries routing and communications ASIC, with Dragonfly network topology.

File Systems

The $SCRATCH space, /scratch/snx3000/$USER, is connected via an Infiniband interconnect. The shared storage under /project and /store is available from the login nodes only.

Please carefully read the general information on filesystems at CSCS.

For further information, please contact help(at)cscs.ch.