This article explains Go's memory allocator by comparing it with the Linux kernel SLAB allocator, detailing the page‑heap (mheap), span structures, per‑P caches (mcache), and the mallocgc path for small and large allocations, while showing key source code snippets and diagrams.
The article details a MySQL memory‑usage incident at Qunar where abnormal slab memory, especially dentry allocation, caused a rapid increase in used memory after a mis‑configured yum makecache cron job, and explains the investigation steps, Linux memory concepts, diagnostic commands, and the corrective actions taken.
This article demystifies Linux memory accounting by explaining the differences between RSS, free, buffers/cache, slab, and page tables, showing how to interpret the free command output, use tools like nmon and slabtop, and providing scripts to calculate actual memory consumption.
This article explains why Linux's `free` command often reports higher used memory than the RSS values shown by `ps aux`, covering buffer/cache reclaimable memory, slab and page‑table consumption, and provides Bash scripts to accurately calculate total memory usage.
This article explains why the memory reported by ps RSS differs from the free command, walks through interpreting free -m output, demonstrates clearing caches, and shows how to account for process RSS, slab allocations, and PageTables to reconcile total used memory on Linux systems.
A CentOS server appeared to lose dozens of gigabytes of RAM because the free command hides large Slab allocations, and the article explains how to identify, clear, and properly tune the system to prevent hidden memory consumption.
