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Welcome to the SummerSchool2014 wiki!
This page contains the presentations and defines exercises for the the CSCS-USI 2014 summer school. We would like participants to work in pairs on the exercises, and will try our best to match stronger programmers with less strong ones.
As mentioned in the course requirements, all participants should bring along an X-windows-capable laptop. You will do all the hands-on training on a Linux "Todi" platform: http://user.cscs.ch/hardware/todi_cray_xk7/index.html
Wireless network: connect to "cscs", use password supplied during lecture.
- Log into Todi:
ssh -Y todi # -Y allows X protocol
At this point you are on log-in node; cross-compiled code will not run here, but rather only on a "compute node"
- Load the module with the GIT version control system
module load git
- Swap in the GNU programming environment
module swap PrgEnv-cray PrgEnv-gnu
- Allocate 1 compute node for your work (valid for one hour). This should suffice for one exercise.
salloc -N 1
With this allocation you should be able to compile and run software interactively. One node provides 16 CPU cores, e.g., for 16 MPI processes each with a single thread, one process with 16 threads, eight processes with two threads each, etc.
- Later in the course you may experiment with the code distributed over multiple nodes, e.g.,
salloc -N 4
4 nodes will sensibly support up to 64 mpi processes, or a combination of processes or threads (but still with maximum 16 threads per nodes, since threads must be in a shared memory space).