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Welcome to the FoMICS Autumn School GPU_Libraries_2013 wiki!
This page contains exercises and other information for the the FoMICS Autumn School 2013 on GPU-enabled libraries, given at the Universita Svizzera Italiana (USI) on Sep. 14-15, 2013, as a prelude to the Domain Decomposition 22 Conference.
Instructions for wireless will be given at start of course.
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
- Log into the CSCS front-end ela.cscs.ch
ssh -Y [email protected] # -Y allows X protocol
The user number XX and the password will be provided in the course.
- 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
- When ready to do an exercise, 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).