Qlustar General November 2025

qlustar-general@qlustar.org

3 participants
4 discussions

Qlustar enters Top 100
by no-reply-list＠qlustar.org 21 Nov '25

21 Nov '25

This week at SC 25 in St. Louis, a recently implemented Qlustar 14 AI Kubernetes cluster entered the Top 500 list at rank 90 with a measured Linpack performance of *19.48 PFlop/s*. This huge success establishes Qlustar as a proven platform for even the most demanding work-loads in the AI and HPC universe. The cluster worker nodes are HGX machines each of them hosting 8 NVIDIA H100 (80GB HBM3) GPUs which are networked in a rail-optimized fat-tree NDR Infiniband fabric. Qlustar's new NVIDIA image modules support this hardware out-of-the-box with optimal performance. The *Qlustar Kubernetes stack* powering this cluster will become GA and be officially introduced in an upcoming Qlustar 14 feature release. [1] https://top500.org/system/180424/

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Qlustar Feature Update 11/25
by no-reply-list＠qlustar.org 21 Nov '25

21 Nov '25

A large bunch of new features were completed and published since the Qlustar 14 release, both in QluMan as well as for Nvidia Enterprise GPU support. Please consult the comprehensive overview at https://qlustar.com/news/2025/2025-11-21-feature-update-11-25

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ssh server and oom_score_adj
by Rolandas Naujikas 13 Nov '25

13 Nov '25

Hi, Recently I found that our login nodes are abused with users running heavy nodejs sessions (from visual studio code). I setup some memory limits for users and OOM is coming, but cannot kill users processes, because all of them are with oom_score_adj=-1000. It is coming from parent sshd server also with oom_score_adj=-1000. As a workaround I'm stopping traditional ssh server and starting ssh.socket at boot (via rc.boot script). Now oom_score_adj=0 as it should be. That is also important for computing nodes with ssh connection enabled. Regards Rolandas P.S. We are still on Qlustar 13, so I don't know situation on Qlustar 14, but it could be different because ssh connection in Ubuntu 24.04 LTS is activated via ssh socket already.

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Add users from command line
by Rolandas Naujikas 11 Nov '25

11 Nov '25

Hi, Do there is some way to add/manage users in Qlustar 12/13/14 from command line ? Some admins have difficulties to run qluman GUI. Could it be done via Qluman router API ? Regards Rolandas

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Qlustar General November 2025