Tagged articles

13 articles

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Machine Learning Algorithms & Natural Language Processing

May 3, 2026 · Artificial Intelligence

Running a 400B Mixture‑of‑Experts LLM on iPhone 17 Pro: Inside Flash‑MoE

The article details how the open‑source Flash‑MoE engine streams a 400‑billion‑parameter Mixture‑of‑Experts language model on an iPhone 17 Pro, achieving interactive‑level token throughput by eliminating Python dependencies, crafting a custom Metal pipeline, and streaming weights directly from SSD.

Apple SiliconFlash-MoEGCD

0 likes · 7 min read

Running a 400B Mixture‑of‑Experts LLM on iPhone 17 Pro: Inside Flash‑MoE

Huolala Tech

Dec 31, 2025 · Fundamentals

Why Does __dispatch_barrier_waiter_redirect_or_wake Crash on iOS 14‑16? A Deep GCD Investigation

The article analyses a recurring crash in an iOS driver app caused by the __dispatch_barrier_waiter_redirect_or_wake function in libdispatch, explains the EXC_BREAKPOINT/SIGTRAP mechanism, compares libdispatch versions, reveals a premature queue release due to non‑atomic reference‑count handling, and proposes replacing GCD‑based barriers with pthread_rwlock_t to eliminate the bug.

BarrierCrashGCD

0 likes · 15 min read

Why Does __dispatch_barrier_waiter_redirect_or_wake Crash on iOS 14‑16? A Deep GCD Investigation

Java Tech Enthusiast

Nov 3, 2025 · Fundamentals

How to Insert GCD Nodes into a Linked List – Step-by-Step Java Solution

An insightful story warns against cutting valuable talent, followed by a detailed Java solution that inserts the greatest common divisor between each pair of nodes in a singly linked list, complete with algorithm explanation, code, complexity analysis, and edge‑case handling.

GCDJavainterview

0 likes · 6 min read

How to Insert GCD Nodes into a Linked List – Step-by-Step Java Solution

Wu Shixiong's Large Model Academy

Nov 10, 2023 · Fundamentals

Minimizing the Sum of a Distinct Array with GCD k

Given two positive integers n and k, construct an array of n distinct numbers whose greatest common divisor is k and whose total sum is as small as possible, then output that minimal sum.

ArrayGCDalgorithm

0 likes · 5 min read

Minimizing the Sum of a Distinct Array with GCD k

Python Crawling & Data Mining

Aug 30, 2023 · Fundamentals

How to Compute List GCD with NumPy and Scale Numbers Efficiently

This article walks through a Python community member's question about using NumPy to find the greatest common divisor of a comma‑separated list of numbers and then dividing each number by that GCD, showing the debugging process, code corrections, and final working solution.

GCDNumPyPython

0 likes · 5 min read

How to Compute List GCD with NumPy and Scale Numbers Efficiently

Rare Earth Juejin Tech Community

Aug 29, 2022 · Mobile Development

Optimizing iOS App Startup by Adjusting GCD Queue QoS and Reducing Main Thread Preemption

By analyzing thread preemption on low‑end iPhones, this article demonstrates how selecting appropriate GCD queue QoS levels—favoring Utility or Background over User‑Initiated—reduces main‑thread contention, improves launch screen rendering by ~100 ms, and accelerates message list first‑load by up to 1.5 s without altering business logic.

GCDQoSconcurrency

0 likes · 10 min read

Optimizing iOS App Startup by Adjusting GCD Queue QoS and Reducing Main Thread Preemption

Huolala Tech

Aug 9, 2022 · Mobile Development

How HLL’s Thread Governance Cut Crashes and Boost iOS Driver App Performance

This article explains how the HLL iOS driver team identified excessive global‑queue usage, thread‑switch overhead, deadlocks and UI‑thread violations, then introduced a priority‑aware queue pool, refined concurrency controls, and built long‑term monitoring to dramatically reduce crashes and improve performance.

GCDThread Managementcrash reduction

0 likes · 13 min read

How HLL’s Thread Governance Cut Crashes and Boost iOS Driver App Performance

IT Services Circle

Feb 6, 2022 · Fundamentals

Measuring Water with Two Cups: Logical Analysis and C++ Implementation

This article explains the classic water‑jug interview problem using two cups of 9 L and 15 L, derives the reachable volumes via greatest‑common‑divisor logic, and provides complete C++ code to determine feasibility and output the pouring steps for any target volume.

GCDalgorithminterview question

0 likes · 6 min read

Measuring Water with Two Cups: Logical Analysis and C++ Implementation

Sohu Tech Products

Nov 25, 2020 · Mobile Development

Deep Dive into GCD Dispatch Queues, sync/async Behavior, and RunLoop Interaction on iOS

This article explores the intricacies of Grand Central Dispatch on iOS, debunking common misconceptions about main thread and main queue execution, analyzing the internal handling of synchronous tasks, and demonstrating how run‑loop activation influences queue‑thread relationships through a series of code experiments.

AsyncGCDdispatch_queue

0 likes · 14 min read

Deep Dive into GCD Dispatch Queues, sync/async Behavior, and RunLoop Interaction on iOS

Amap Tech

Feb 27, 2020 · Mobile Development

Common Misunderstandings and Pitfalls in iOS Development – Foundation, UIKit, GCD and Best Practices

The article clarifies frequent iOS development misconceptions—from unnecessary observer removal and deprecated NSUserDefaults synchronization to block retain‑cycle tricks, responder‑chain versus hit‑testing differences, GCD queue optimizations, safe main‑queue detection, and proper cancellation of dispatch blocks—offering practical code guidance.

GCDMemory ManagementObjective‑C

0 likes · 17 min read

Common Misunderstandings and Pitfalls in iOS Development – Foundation, UIKit, GCD and Best Practices

JD Retail Technology

Jan 10, 2020 · Mobile Development

Understanding iOS Timers: NSTimer, CADisplayLink, and GCD Dispatch Sources

This article explains the three main iOS timer mechanisms—NSTimer, CADisplayLink, and GCD dispatch sources—detailing their creation methods, differences, common pitfalls such as RunLoop mode and thread issues, and practical solutions for accurate scheduling.

CADisplayLinkGCDMobile Development

0 likes · 14 min read

Understanding iOS Timers: NSTimer, CADisplayLink, and GCD Dispatch Sources

Qunar Tech Salon

Jul 27, 2017 · Mobile Development

Deep iOS Performance Optimization: Time Complexity, GCD, Thread Monitoring, and Method Hooking

This article explains how to analyze and improve iOS app performance by understanding time‑complexity impacts, leveraging GCD for asynchronous work, preventing thread explosion, optimizing I/O and memory usage, and using low‑level techniques such as stack tracing, symbolication, and objc_msgSend hooking.

GCDMethodHookingThreadMonitoring

0 likes · 22 min read

Deep iOS Performance Optimization: Time Complexity, GCD, Thread Monitoring, and Method Hooking

Tencent TDS Service

Jun 26, 2015 · Mobile Development

How to Eliminate iOS App Lag: Master Main Thread Management

This article explains why iOS apps experience lag due to main‑thread blocking, demonstrates the problem with sample code, and provides practical solutions using GCD and monitoring tools like Bugly to keep the UI responsive and improve user satisfaction.

BuglyGCDLag

0 likes · 6 min read

How to Eliminate iOS App Lag: Master Main Thread Management