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Pitzer
We upgraded the operating system on the Pitzer cluster from RHEL7 to RHEL9 on July 28 2025. This upgrade introduces several software-related changes compared to the RHEL7 environment used on the Pitzer and provides access to modern tools and libraries but may also require adjustments to your workflows. Please refer to
Ascend, Cardinal, Pitzer
Podman is an Open Containers Initiative (OCI)‑compliant, daemonless and rootless container tool developed by Red Hat. Unlike Docker, Podman operates without a central daemon and supports secure rootless execution, making it well‑suited for HPC environments and schedulers such as Slurm.
This document serves as a knowledge base for properly managing and diagnosing threading issues in user jobs. It focuses on OpenMP, Intel Math Kernel Library (MKL), and common thread-related misuse at OSC.
Understanding Threading with OpenMP and MKL
Intel MKL is widely used in HPC for linear algebra, FFTs, and statistical routines. MKL is multithreaded by default, which can significantly improve performance but only when correctly configured.
Pitzer
While OSC has upgraded the Pitzer cluster to RHEL 9, you may encounter difficulties when migrating jobs from RHEL 7 to the new system. To help you continue your research, we provide a containerized RHEL 7 environment on Pitzer RHEL 9. This container replicates the original RHEL 7 system and software environment used on Pitzer.
Pitzer
The Pitzer RHEL 9 cluster (hereafter referred to as "Pitzer") is now running on Red Hat Enterprise Linux (RHEL) 9, introducing several software-related changes compared to the RHEL 7 environment used on the Pitzer. These updates provide access to modern tools and libraries but may also require adjustments to your workflows.
Ascend, Cardinal, Pitzer
Intel's implementation of the Message Passing Interface (MPI) library. See Intel Compilers for available compiler versions at OSC.
Cardinal
Ollama is an open-source inference server for large language models (LLMs). This module also includes Open-WebUI, which provides an easy-to-use web interface.
