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Xiao Lou's Tech Notes

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Latest from Xiao Lou's Tech Notes

79 recent articles

Xiao Lou's Tech Notes

Mar 13, 2025 · Fundamentals

Master Go’s New Cleanup Functions and Weak Pointers for Safer Memory Management

Go 1.24 introduces runtime.AddCleanup and weak.Pointer, advanced garbage‑collector tools that let developers attach cleanup callbacks without retaining objects and safely cache objects via weak references, offering more precise memory management, eliminating finalizer pitfalls, and enabling custom unique‑package implementations.

cleanup functionsruntime.AddCleanupweak references

0 likes · 9 min read

Master Go’s New Cleanup Functions and Weak Pointers for Safer Memory Management

Xiao Lou's Tech Notes

Feb 24, 2025 · Backend Development

When to Use a Goroutine Pool in Go: Performance, Memory, and Stability Guide

This article explains the fundamentals of Go goroutines and goroutine pools, compares their performance and memory usage, provides code examples, offers a decision guide for when to use each approach, and recommends the ants library for efficient pool management.

GoGoroutinegoroutine pool

0 likes · 5 min read

When to Use a Goroutine Pool in Go: Performance, Memory, and Stability Guide

Xiao Lou's Tech Notes

Feb 17, 2025 · Backend Development

Swiss Tables in Go 1.24: Open Addressing, SIMD, and Metadata Secrets

The article explains how Go 1.24’s new Swiss Tables hash‑map implementation replaces the traditional bucket‑based design with open addressing, SIMD‑accelerated probing, and metadata separation, detailing the underlying principles, performance advantages, handling of clustering and deletions, and a comparison with previous Go maps and Java’s HashMap.

GoSIMDhash map

0 likes · 16 min read

Swiss Tables in Go 1.24: Open Addressing, SIMD, and Metadata Secrets

Xiao Lou's Tech Notes

Feb 14, 2025 · Operations

How to Seamlessly Switch Your Mac from Intel to Apple Silicon with Minimal Hassle

This guide walks you through backing up data, reinstalling essential software, and configuring a new Apple‑silicon Mac after moving from an Intel‑based machine, offering practical tips to avoid clutter and ensure a smooth transition.

Apple SiliconMac migrationSoftware Installation

0 likes · 3 min read

How to Seamlessly Switch Your Mac from Intel to Apple Silicon with Minimal Hassle

Xiao Lou's Tech Notes

Feb 19, 2024 · Fundamentals

How I Decoded a Mysterious Binary Message into Chinese Characters

During a Spring Festival park visit, I discovered a binary‑encoded poster, used OCR and custom Go code to translate the bits, learned it was UTF‑8 Unicode for Chinese characters, and explained the byte‑pattern rules that reveal the hidden message.

Binary DecodingPythonUTF-8

0 likes · 5 min read

How I Decoded a Mysterious Binary Message into Chinese Characters

Xiao Lou's Tech Notes

Jan 19, 2024 · Backend Development

Why Two Simple Alarms Cause a Java Deadlock – Lessons on Synchronized Locks

A Java program that creates two alarm threads and a single shared object ends up in a deadlock because each thread holds its own lock while waiting for the other's lock, illustrating the pitfalls of careless synchronized usage.

DeadlockJavamultithreading

0 likes · 5 min read

Why Two Simple Alarms Cause a Java Deadlock – Lessons on Synchronized Locks

Xiao Lou's Tech Notes

Aug 2, 2023 · Backend Development

Why Fastjson Breaks SpringBoot Agents and How to Resolve the ClassLoader Conflict

This article analyzes how adding Fastjson to a SpringBoot agent causes classloader conflicts that prevent GenericHttpMessageConverter from loading, explains the underlying parent‑delegation mechanism, and presents solutions such as using Maven Shade to rename packages or switching to a lightweight JSON library like Gson.

Dependency ConflictFastJSONGson

0 likes · 16 min read

Why Fastjson Breaks SpringBoot Agents and How to Resolve the ClassLoader Conflict

Xiao Lou's Tech Notes

Jul 7, 2023 · Databases

How Didi Cut ClickHouse CPU Usage by 90% with a Simple Thread Check Fix

This article walks through how Didi identified excessive CPU consumption by ClickHouse background move threads, diagnosed the root cause using top and pstack, and applied a lightweight code guard that reduced CPU load from 30% to under 5%, improving overall cluster performance.

CPUClickHousePerformance optimization

0 likes · 9 min read

How Didi Cut ClickHouse CPU Usage by 90% with a Simple Thread Check Fix

Xiao Lou's Tech Notes

Jun 26, 2023 · Backend Development

Why SkyWalking’s ThreadPool Plugin Failed and How I Fixed It

This article explains the root cause of the thread‑pool plugin enhancement failure in SkyWalking—duplicate AgentClassLoader instances—detailing the investigation steps, code changes, and two practical solutions to ensure reliable instrumentation of ThreadPoolExecutor.

InstrumentationJavaAgentThreadPool

0 likes · 18 min read

Why SkyWalking’s ThreadPool Plugin Failed and How I Fixed It

Xiao Lou's Tech Notes

May 29, 2023 · Backend Development

Why Is My Go Health‑Check So Slow? Diagnosing TCP Latency and GC Overhead

This article investigates why a Go‑based service health‑check system experiences high latency, examines differences from Nginx checks, runs experiments on physical machines and Docker, and explores goroutine scheduling, GOMAXPROCS, and garbage‑collection tuning to reduce average response time from 40 ms to under 10 ms.

DockerHealth CheckPerformance optimization

0 likes · 10 min read

Why Is My Go Health‑Check So Slow? Diagnosing TCP Latency and GC Overhead