Simon Westersund [CSC - IT Center for Science]
Simon is a System specialist at CSC - IT Center for Science Ltd. He has been participating in the roll-out and operations of Open OnDemand on three different supercomputers since 2021, including the pre-exascale system LUMI. CSC operates OOD via a containerized deployment, which creates interesting opportunities for testing and development for OOD. CSC is an active contributor to the OOD project, including code submissions, issue reporting, and testing.
Session
A walk-through of concrete issues and performance improvements
which CSC has identified when approaching a scale of hundreds of concurrent
users on Open OnDemand. The aim is to inform system administrators and developers
who are operating an OOD instance about potential pitfalls, as well as quirks
which only become visible at a larger scale.
This technical talk will consider site-specific issues, code-specific issues in the OOD
upstream, as well as architectural impacts of using Passenger.
A general understanding of the OOD architecture, Passenger's role in it, and
Linux systems programming is beneficial.