https://frn.sh/c/cpu/Recent content in Cpu onHugoen-USCopyright © Fernando Simões.Thu, 11 Dec 2025 00:00:00 +0000https://frn.sh/tforks/Thu, 11 Dec 2025 00:00:00 +0000https://frn.sh/tforks/First week at a new job. A colleague was showing me around our Grafana dashboards, just routine monitoring of the baremetal machines. One caught my eye: a machine with 32GB RAM and a top-of-the-line processor was hitting 90% CPU. A few containers running, no alerts, and nobody had reported anything. I found a process with cmd bash startup.sh that had been running for 28 minutes. I straced it for a few minutes:https://frn.sh/sigterm/Sun, 08 Jun 2025 00:00:00 +0000https://frn.sh/sigterm/Load average hit 12 on a 2 vCPU machine during a production incident. My first thought was that CPU must be the bottleneck - 12 is 6x the core count. But it wasn’t. Linux load average counts three things: processes running on a CPU, processes waiting in the run queue, and processes in uninterruptible sleep - D state. From the kernel source: The global load average is an exponentially decaying average of nr_running + nr_uninterruptible.