Memory

Under pressure

Author: Adrian Jackson
Posted: 23 Mar 2020 | 10:45

Squeezed performance

Memory under pressure

I was recently working with a colleague to investigate performance issues on a login node for one of our HPC systems. I should say upfront that looking at performance on a login node is generally not advisable, they are shared resources not optimised for performance.

We always tell our students not to run performance benchmarking on login nodes, because it's hard to ensure the results are reproducible. However, in this case we were just running a very small (serial) test program on the login node to ensure it worked before submitting it to the batch systems and my colleague noticed a performance variation across login nodes that was unusual.

View from the storage side

Author: Adrian Jackson
Posted: 16 Aug 2017 | 15:59

Flash Memory Summit Logo

I recently attended the 2017 Flash Memory Summit, a conference primarily aimed at storage technology and originally based around flash memory, although it has expanded to cover all forms of non-volatile storage technology.

Non-volatile memory is a big deal nowadays.  It is memory that stores data even when it has no power (unlike the volatile memory in computers that lose data when power is switched off).  Flash memory is a particular form for non-volatile memory, it's been used for a long time, and has had a massive impact on consumer technology, from the storage in your cameras and phones, to SSD hard drives routinely installed in laptop and desktop systems.

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