The philosophy behind "Stroll": continuous learning, curiosity‑driven, and practice‑focused.
The article walks through a real‑world Linux alert showing a 243% CPU IO Wait, explains how to interpret the metric, gathers system basics, uses iostat, iotop, pidstat and mpstat to probe the IO subsystem, checks disk health, and ultimately discovers the root cause was a mis‑configured Prometheus alert rule.
This guide walks through setting up a Ubuntu VM, installing Docker, pulling the AnythingLLM image, configuring storage, launching the container, and using it to ingest and query local documents with a DeepSeek‑R1 model.
This article explains Linux filesystem structures, the virtual filesystem layer, various disk I/O mechanisms—including buffered, non‑buffered, blocking, non‑blocking, synchronous and asynchronous I/O—and provides practical commands for observing inode and dentry caches to aid performance optimization.
This guide explains essential Linux memory metrics, demonstrates how to use tools like free, top, vmstat, sar, and ps, and outlines a systematic, layered approach to pinpointing and resolving memory problems, including cache analysis and leak detection.
This guide explains how to install fio on Ubuntu 20.04, configure test environments, run IOPS and latency benchmarks with specific parameters, and interpret key metrics such as bandwidth, IOPS, slat, and clat to evaluate storage performance under high‑load and single‑request scenarios.
This guide explains how Linux memory leaks occur, why they harm system stability, and provides step‑by‑step commands—including top, ps, pmap, vmstat, and the memleak utility—to identify, monitor, and resolve leaking processes efficiently.
This guide explains Linux in‑memory caching, distinguishes buffers from cache, shows how to interpret cache metrics like hit rate, provides commands to clear caches, and introduces the cachestat and cachetop tools for detailed cache analysis.
This guide explains the necessity of flow control in high‑performance storage networks, details RDMA and RoCE protocols, and provides step‑by‑step commands for configuring DSCP, PFC, ECN, and related settings on servers and switches.
Linux swap provides a disk‑backed memory extension, storing anonymous pages when RAM runs low; this article explains swap’s operation, the kernel’s memory reclamation thresholds, tuning parameters like min_free_kbytes and swappiness, and offers commands to locate high‑swap processes and safely clear swap.
After installing drivers on an NVIDIA Tesla A100, the GPU reports a constant 25% utilization despite no workload, which can be resolved by enabling persistence mode using a simple nvidia‑smi command to keep the driver loaded and improve performance stability.
