Announcements, 28th April 2015

Shaheen-I job size limitation

We only have a limited number of spare parts for Shaheen, and yesterday we exhausted our stock of node cards.

We have had another node card failure this morning, which means that we are now in the situation where we are ‘cannibalising’ the system to supply parts.

With immediate effect we have taken two node cards offline in rack 00.

This means that we can no longer run 16 rack jobs and the maximum size job that can be run on Shaheen is now 12288 nodes (12 racks).

Data Centre Power Outage Notification – Shaheen II Benchmark Test

As part of Shaheen-II contractual acceptance, a critical benchmark test is required to be performed (High-Performance Linpack, or HPL). HPL is a very power intensive test that requires all the data centre cooling to be made available for Shaheen II during this stress test.

In addition to being a contractual acceptance requirement, the results of this test will be used to determine KAUST’s placement in the Top 500 list of the fastest supercomputers in the world.

The Scientific Computer Centre (SCC) data centre will therefore experience a full outage from Monday 4th May 2015 17:00 to Sunday 17th May 10:00. We realise and acknowledge that this outage period will have a negative impact on your research and we will endeavour to make it as short an outage as possible.

This is a one-time test that is required to be run over consecutive days.

/scratch disk usage

The /scratch filesystem is designed for interim high speed storage during job runs on the system. The disk space usage of /scratch is now over 85% and is continuing to grow. Please could we ask all users to remove any files they no longer need. We may have to consider implementing an automatic removal of old files if the free space available continue to decline.

Tip of the Week: Record a log of your terminal session

How can we record everything we type in the terminal and all the output produced into a file? There is a command named script that can be used for this purpose. Just type script <filename> and everything will be recorded, not only the commands, but also the output. Once finished, type exit to end the recording session.

bash-3.2$ script my_history_April28_2015
Script started, output file is my_history_April28_2015
….
bash-3.2$ exit
exit
Script done, output file is my_history_April28_2015

Follow us on Twitter

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