wiki.chpc.ac.za

To test a job on a compute node first get onto an interactive node with the following:

   qsub -I -P YOURPROGRAMME(E.G. CSCI1234) -q smp -l select=1:ncpus=24

Once on an interactive node (cnodeNNNN) you need to load up the appropriate modules:

   module purge
   module load chpc/python/3.6.1_gcc-6.3.0

Then

   cd /mnt/lustre/users/YOURUSERNAME or where ever you placed your .py file

Finally run

   python nameofyourfile.py

If you import matplotlib in your python script you may end up with the following error:

   ModuleNotFoundError: No module named '_tkinter'

If so then add the following to your python script before resubmitting

   import matplotlib
   matplotlib.use('agg')

As with CPU version you can test your python jobs on an interactive node:

   qsub -I -P YOURPROGRAMME(E.G. CSCI1234) -q gpu_1 -l select=1:ncpus=10:ngpus=1

Once on an interactive node (gpuNNNN) you need to load up appropriate modules:

   module purge
   module load chpc/cuda/10.0
   module load chpc/python/anaconda/3-2019.03

Then

   cd /mnt/lustre/users/YOURUSERNAME or where ever you placed your .py file

When running on a single GPU you need to include the following in your .py file to ensure that not all the CPU's on the node get consumed, thereby resulting in your job being killed by the scheduler

    session_conf = tf.ConfigProto(intra_op_parallelism_threads=10,inter_op_parallelism_threads=10)
    sess = tf.Session(config=session_conf) 

Finally run

   python nameofyourfile.py

If you wish to run jobs through the scheduler then there are scripts on the login node that can help you setup a PBS submission script

Once you are on the login node just type:

qtensorflow_cpu (CPU version of Tensorflow)

or

qtensorflow_gpu (GPU version of tensorflow)

Examples of what is needed when running the above scripts are provided below:

          EXAMPLE1
 Enter research programme name
 CSCI1234
 Enter python script name (with .py extension)
 test.py
 Enter total walltime (hour:minute)
 2:00
 Enter email address
 testing@gmail.com
 Generated pbs file for test
 Do you wish to submit job to cluster (y/n)
 y

          EXAMPLE2
 Enter research programme name
 CSCI1234
 Enter python script name (with .py extension)
 test.py
 Enter total walltime (hour:minute)
 
 Enter email address
 testing@gmail.com
 Generated pbs file for test
 Do you wish to submit job to cluster (y/n)
 y

Please take note of empty space in EXAMPLE2. This corresponds to the enter key