Tag: #memory

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• DRAM Address Scrambling and the Layer Beneath a Security Boundary — What Happens When the Fence Sits Above the Translation

  A research tool was published that reads the most hidden memory regions inside a CPU by perturbing address translation in the DRAM controller. The vulnerability is not in any cipher or permission check. It is in the layo

  2026-08-14 · 7 min read #security#hardware#memory#reverse-engineering#firmware

• When the OOM Killer Kills a Process — From Decoding the dmesg Report to Telling cgroup OOM Apart

  A process vanished without leaving a single log line and the exit code is 137. This post covers how to read the dmesg report left behind by the kernel OOM Killer one line at a time, how the badness score is computed and

  2026-07-26 · 18 min read #linux#memory#oom#cgroups#kubernetes

• Kubernetes OOMKilled(137) Memory Troubleshooting — What to Check Before You Raise the Limit

  This post covers the situation where a container dies with Exit Code 137 while the application log leaves behind no exception at all. It starts from the fact that 137 tells you only one thing, 128 plus 9, that is SIGKILL

  2026-07-26 · 14 min read #kubernetes#oomkilled#memory#jvm#cgroup

• Do Not Reread — Close the Book and Recall: The Original Testing-Effect Paper and the Spaced-Repetition Algorithm

  Rereading your notes feels like knowing, but the exam exposes the gap. Roediger and Karpicke's 2006 experiment shows exactly why: rereading wins a test five minutes later, then loses badly to repeated retrieval (testing

  2026-07-20 · 7 min read #psychology#paper-review#mindset#learning#memory

• CXL Memory Tiering: How Far Has the Kernel Come — What DAMON Merged, and What the Numbers Didn't Measure ♪ Listenable

  Even when CXL hardware is plugged into a server, it's the kernel that actually decides which pages are hot and which are cold and moves them. As of July 2026, Linux mainline has received DAMON/DAMOS-based tiering pieces

  2026-07-16 · 19 min read #hardware#cxl#memory#linux-kernel#performance

• Reviving Retired DDR4 — Meta's CXL Bridge Chip, Vistara

  DDR5 prices keep rising while perfectly good DDR4 from retired servers piles up in the warehouse. Meta's Vistara, presented at ISCA 2026, is a custom CXL bridge chip that revives that old DDR4 inside modern DDR5 servers

  2026-07-11 · 7 min read #cxl#infrastructure#memory#hardware#sustainability

• The Secrets of Memory — It Is a Skill, Not a Talent

  Memory is not a fixed talent you are born with but a combination of techniques and biology you can exploit. The Ebbinghaus forgetting curve, the spacing effect, retrieval practice (the testing effect), the memory palace,

  2026-07-04 · 9 min read #memory#learning#psychology#cognition

• The Science of Memory 2026 — A Neuroscience-Based Deep Dive into Memory Optimization ♪ Listenable

  Everything about memory optimization grounded in real research — from the Ebbinghaus forgetting curve to the FSRS algorithm. We cover spaced repetition, retrieval practice, the testing effect, the memory palace, chunking

  2026-07-02 · 29 min read #memory#spaced-repetition#anki#fsrs#active-recall

• Rust Smart Pointers: Box, Rc, Arc, RefCell & Interior Mutability

  Smart pointers unlock the cases Rust ownership alone struggles to express. Put values on the heap with Box, share ownership with Rc and its thread-safe cousin Arc, move the borrow rules from compile time to run time with

  2026-06-30 · 11 min read #rust#memory#systems

• Stack vs Heap: How Memory Really Works

  The stack and the heap are not just "two regions of memory." One is a fast, fixed, LIFO world of frames; the other is a dynamic space ruled by malloc and garbage collectors. This post digs from the ground up into pointer

  2026-06-24 · 16 min read #systems#memory#fundamentals

• Science Fiction Short Story: The Shop That Buys Memories ♪ Listenable

  A short science-fiction story set in a small shop where memories are bought and sold, exploring memory, identity, and the meaning of loss through one customer and the choice he must make.

  2026-06-21 · 20 min read #fiction#science-fiction#short-story#memory#identity

• Scent and Memory — Why a Fragrance Summons the Past ♪ Listenable

  Why a single smell can drag an entire moment from decades ago back into the present, traced through the unusual brain wiring of the sense of smell. A walk along the scent trail through the Proust phenomenon, the amygdala

  2026-06-21 · 26 min read #culture#memory#olfaction#neuroscience#perfume

• The Science of Learning — How Retrieval and Spacing Build Memory ♪ Listenable

  Why does highlighting and rereading fail you? This essay unpacks the core findings of learning science — retrieval practice, spaced repetition, interleaving — with fun experiments. You will learn why solving and getting

  2026-06-20 · 22 min read #culture#learning-science#retrieval-practice#spaced-repetition#memory

• The Semiconductor Memory Supercycle — How HBM Changed the Game

  We examine how the memory semiconductor cycle works and use data to explain how high-bandwidth memory (HBM) rewrote the rules of the game. We weigh the competitive landscape of SK hynix, Samsung, and Micron, the cycle ri

  2026-06-18 · 7 min read #finance#semiconductors#memory#hbm#sk-hynix

• Metacognition and Strengthening the Circuit — Retrieval Builds the Brain

  Listening alone does not build the circuit. Only when you retrieve does the circuit fire and grow stronger. This essay covers the science of retrieval practice, using metacognition to discover what you do not know, and m

  2026-06-17 · 17 min read #metacognition#retrieval-practice#learning#language#memory

• Hacking the Linux Memory Hierarchy — swap, zram, and the Wild Idea of Swapping to VRAM

  The nbd-vram project, which exposes GPU VRAM as an NBD block device to use as swap, made waves on Hacker News. Starting from there, this post covers Linux memory management fundamentals, swappiness and zram/zswap tuning,

  2026-06-12 · 16 min read #linux#memory#swap#zram#kernel

• Context Engineering — How to Design Memory for AI Agents

  The era of prompt engineering is fading, and context engineering has emerged as the core skill. This post covers the economics of the context window, memory tier design, patterns for automatically extracting facts from c

  2026-06-12 · 17 min read #ai#context-engineering#llm#ai-agent#memory

• Redis Production Operations Complete Guide 2025: Cluster, Persistence, Memory, Redis 7+

  Everything about Redis in production! 8 data structures, persistence (RDB vs AOF), Sentinel vs Cluster, memory management (maxmemory-policy), performance tuning, Redis 7+ features, Valkey/KeyDB comparison, monitoring and

  2026-04-15 · 8 min read #redis#cache#production#cluster#persistence

• CPU Cache & Memory Hierarchy Complete Guide 2025: L1/L2/L3, Cache Line, False Sharing, Performance Tuning

  Everything about the memory hierarchy: L1/L2/L3 cache, cache line, MESI protocol, false sharing, cache-friendly data structures, NUMA, mechanical sympathy, and hands-on performance tuning.

  2026-04-15 · 11 min read #cpu-cache#memory#performance#cache-line#false-sharing

• Amazon Bedrock AgentCore Practical Guide: How to Build Secure Production Agents in 2026

  A practical guide to Amazon Bedrock AgentCore for teams that need secure, production-ready agents, with clear coverage of Runtime, Memory, Gateway, observability, and rollout checks.

  2026-04-12 · 6 min read #aws#bedrock#agentcore#ai-agent#mcp