KAUST Supercomputing Laboratory Newsletter 15th October 2020

In this newsletter:

  • RCAC meeting
  • Tip of the week: How to get more memory for my job?
  • Follow us on Twitter
  • Previous Announcements
  • Previous Tips

 

RCAC meeting

The project submission deadline for the next RCAC meeting is 31st October 2020. Please note that the RCAC meetings are held once per month. Projects received on or before the submission deadline will be included in the agenda for the subsequent RCAC meeting. The detailed procedures, updated templates and forms are available here: https://www.hpc.kaust.edu.sa/account-applications

 

Tip of the week: How to get more memory for my job?

When you are facing memory issues, the work around is to reduce the number of tasks per node but you will need more node.

You will gain not only more memory per task but also more memory bandwidth, therfore your application should run a bit faster. If your application makes use of OpenMP threads, you might try to use less tasks per node and use accordingly the option --ntasks-per-node --ntasks-per-socket=  within your batch script and srun command and set OMP_NUM_THREADS accordingly, in order to distribute them evenly across the node. Perform some small runs to check the performance gain.

On Shaheen, the memory per node is 128 GB on 6168 nodes, while only 4 nodes have 256 GB of RAM. Neser has 2 nodes with 768GB, 5 nodes with 256GB and 12 nodes with 192GB.

 

Follow us on Twitter

Follow all the latest news on HPC within the Supercomputing Lab and at KAUST, on Twitter @KAUST_HPC.

Previous Announcements

http://www.hpc.kaust.edu.sa/announcements/

Previous Tips

http://www.hpc.kaust.edu.sa/tip/