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How To Emulate CXL Devices using KVM and QEMU
January 20, 2022What is CXL? Compute Express Link (CXL) is an open standard for high-speed central processing unit-to-device and CPU-to-memory connections, designed for high-performance data center computers. CXL is built on the PCI Express physical and electrical interface with protocols in three...
How To Build a custom Linux Kernel to test Data Access Monitor (DAMON)
December 23, 2021DAMON is a data access monitoring framework subsystem for the Linux kernel. DAMON (Data Access MONitor) tool monitors memory access patterns specific to user-space processes introduced in Linux kernel 5.15 LTS, such as operation schemes, physical memory monitoring, and proactive...
Resolving commands ‘Killed’ on GCP f1-micro Compute Engine instances
December 20, 2021When I want to perform a quick task, I generally spin up a Google GCP Compute Engine instance as they’re cheap. However, they have limited resources, particularly memory. When refreshing the package repositories, it’s quite easy to encounter an Out-of-Memory...
How To Monitor Persistent Memory Performance on Linux using PCM, Prometheus, and Grafana
September 16, 2021In a previous article, I showed How To Install Prometheus and Grafana on Fedora Server. This article demonstrates how to use the open-source Process Counter Monitor (PCM) utility to collect DRAM and Intel® Optane™ Persistent Memory statistics, and visualize the...
Using ltrace to see what ipmctl and ndctl are doing
June 23, 2021Occasionally, it is necessary to debug commands that are slow. Or you may simply be interested in learning how the tools work. While there are many strategies, here are some simple methods that show code flow and timing information. To...