今日已更新 243 条资讯 | 累计 30698 条内容
关于我们

今日精选

HOT

最新资讯

共 30698 篇
第 383/1535 页
AI 资讯 Reddit r/programming

Why two O(n²) loops can run 15× apart

Two nested loops can do the same work, have the same O(n²) complexity, and still run around 15× apart. A visual explainer on why: the RAM model, the memory wall, cache lines, locality, L1/L2/L3, prefetching, data layout and false sharing. It also covers how the timing difference between a cache hit and miss became the side channel behind Spectre and Meltdown. submitted by /u/Ok_Marionberry8922 [link] [留言]

/u/Ok_Marionberry8922 2026-07-23 04:31 2 原文
开发者 HackerNews

Ask HN: What changed in your life when you started meditating (and how)?

It's my N-th attempt at learning to meditate. At some point, I realized that even lifting weights, sleeping and eating well aren't enough if you can't tame your thoughts and control your stress level. This time, I have started with the introductory course on the Waking Up mobile app. It's frustratingly difficult to even get through the first lesson in which you are supposed to focus on your breath and minimize the wandering of your mind. I think it would be very motivating to hear the stories of

dondraper36 2026-07-23 04:24 3 原文
开源项目 The Verge AI

Tesla’s revenues are bouncing back, but profits are still weak

After a dismal two years of weakening demand, falling sales, and damage to its brand by Elon Musk's political activities, Tesla's road to recovery continues apace. On the heels of an impressive delivery report, the company released its earnings for the second quarter of 2026 - giving us the latest glimpse at the EV company […]

Andrew J. Hawkins 2026-07-23 04:17 9 原文
AI 资讯 Product Hunt

Fikry

A mis-trained AI powered by bad data and confidence Discussion | Link

serkan uslu 2026-07-23 03:46 3 原文