1. Hands on training session for core skills
HPC Roadshow
Hands on training session for core skills

2. Overview How to Access the System Software Environment - Modules
How to Find Cluster Status and Job Summary
Compiling and Submitting Jobs - Examples

3. How to access the system
Login to the Supercomputing Training Portal ( with the username and password that has been send to you

4. How to access the system
Open a terminal in a new tab

5. How to access the system
Click on the terminal icon in the new tab and you should be logged in to Euclid

6. Environment Setup with Modules
The software environment used on LinkSCEEM systems can be managed via Modules
Modules facilitate the task of updating applications and provide a user-controllable mechanism for accessing software revisions and controlling combination of versions
module avail # lists available modules
module list # lists currently loaded modules
module load x # loads a specific module
module unload x # unloads a specific module
module help x # help on a specific module
module purge # unloades all loaded modules
module show x # lists the full path of modulefile and all of the environment changes the modulefile will make if loaded

7. Modules on Euclid

8. Hands on exercises
From your home directory copy the hands on exercises directory into your home directory
Go into the examples directory
cp -r /opt/examples/ .
cd examples

9. Hands on Exercise 1 Hello World – C code:
#include <stdio.h> #include <mpi.h> int main(int argc, char ** argv) { int size,rank; int length; char name[80]; MPI_Init(&argc, &argv); MPI_Comm_rank(MPI_COMM_WORLD,&rank); MPI_Comm_size(MPI_COMM_WORLD,&size); MPI_Get_processor_name(name,&length); printf("Hello MPI World! Process %d out of %d on %s\n",rank,size,name); MPI_Finalize(); return 0; }

10. Hands on Exercise 1
Script which can be used to define all commands required to submit a job to a HPC resource
#!/bin/bash
#SBATCH --job-name=hello-world
#SBATCH --nodes=2
#SBATCH --ntasks-per-node=8
#SBATCH --time=00:01:00
#SBATCH --error=hello.out
#SBATCH --output=hello.out
module load goolf/1.4.10
mpirun -np 16 hello

11. Hands on Exercise 1
Load the goolf module which includes the GCC compiler, OpenMPI, OpenBLAS, ScaLAPACK, FFTW
Compile the code
Submit the job to the queue
Check the queue status
Check the contents of the output file
module load goolf/1.4.10
mpicc hello.c –o hello
sbatch hello.sub
cat hello.out
squeue

12. Hands on Exercise 2 Hello World – Cuda code
Takes the string "Hello ", prints it, then passes it to CUDA with an array of offsets. Then the offsets are added in parallel to produce the string "World!“
Job submission script:
#!/bin/bash
#SBATCH --job-name=hello-world-cuda
#SBATCH --nodes=1
#SBATCH --ntasks-per-node=8
#SBATCH --time=00:01:00
#SBATCH --gres=gpu:2
#SBATCH --error=hello-cuda.out
#SBATCH --output=hello-cuda.out
module load CUDA/5.5.22
./hello-cuda

13. Hands on Exercise 2 Load the CUDA module Compile the code
Submit the job to the queue
Check the queue status
Check the contents of the output file
module load CUDA/5.5.22
nvcc hello.cu –o hello-cuda
sbatch hello-cuda.sub
squeue
cat hello-cuda.out

14. Thank you