allen7wang

10年产品经理 → 35岁全栈新手 🔄
专注AI项目落地，用产品思维写代码
人生下半场，代码上半场 💻

[allen7wang @allen7wang]

@yeemio

[allen7wang @allen7wang]

@uraly1107 @grok 这是什么事情

[allen7wang @allen7wang]

最近在做产品的定价更新。PaaS产品的一个多维度的模型。市场目前还处于多家混战的状态。 想到一个产品场景：产品报价管理。 计划利用AI 1个人来尝试做这个项目，具体项目信息更新到博客中。

[idoubi @idoubicc]

产品经理有福了。😏

[艾森 Essen @mressen]

全球中文油管不分赛道百强榜单揭晓：第一部分1～50名

[luffy @0xluffy]

reminder

[Rasel Hosen @details_with_ai]

Coding games are the best way to learn coding.

You can improve in CSS, Python, React, JavaScript, and Blockchain through reading app and fun games.

Top 10 Apps you can Learn useful Concepts: 👇

[Orange AI @oran_ge]

很久之前我就说过，用户的需求从来就不是写 prompt 指挥 AI
而是直接说需求「做个抖音出来」
这就是技术和用户之间巨大的 Gap

但是，就在刚刚...
我打开 bolt new，让它做一个抖音出来
它真的做了一个抖音出来...
😲
来看看这段录屏吧

[Darshan 🦖 @darshan]

This neuroscientist worked until she was 103.

She also:

• Won a Nobel Prize at 77
• Became a senator at 92
• Stayed mentally sharp into her 100s

Her secret? 5 daily habits that prevented brain aging: 🧵

[Scholarship for PhD @ScholarshipfPhd]

SUCCESS

[Security Trybe @SecurityTrybe]

Cybersecurity Ecosystem

[Tech Fusionist | Kushal Gangil @techyoutbe]

💥Kubernetes (Imp) Concepts - Cheat Sheet💥

[Scholarship for PhD @ScholarshipfPhd]

Strategic Planning Process

[Dave Kline @dklineii]

The majority of managers fail.

Here's why it's not your fault:

[AshutoshShrivastava @ai_for_success]

In 5-6 years this will be real.

[Interesting STEM @InterestingSTEM]

A Brief History of Artificial Intelligence (AI)

[allen7wang @allen7wang]

Join me on https://t.co/9kPG3wlZlu a cool cycling analytics and training tool for #strava via @intervalsicu

[Dr Milan Milanović @milan_milanovic]

𝗛𝗼𝘄 𝗱𝗼𝗲𝘀 𝗗𝗶𝘀𝗰𝗼𝗿𝗱 𝗵𝗮𝗻𝗱𝗹𝗲 𝗮 𝗺𝗶𝗹𝗹𝗶𝗼𝗻 𝗼𝗻𝗹𝗶𝗻𝗲 𝘂𝘀𝗲𝗿𝘀 𝗶𝗻 𝗮 𝘀𝗶𝗻𝗴𝗹𝗲 𝘀𝗲𝗿𝘃𝗲𝗿?

As time passed, the overall size of Discord's user base, including its most prominent communities, has grown massively. This affected servers that started to slow down and hit their throughput limits. So, they needed to scale individual Discord servers from tens of thousands to millions of concurrent users.

Whenever someone sends a message on Discord or joins a channel, they need to update the date UI of everyone online on that server. They call that server a "𝗴𝘂𝗶𝗹𝗱," which runs in a 𝘀𝗶𝗻𝗴𝗹𝗲 𝗘𝗹𝗶𝘅𝗶𝗿 𝗽𝗿𝗼𝗰𝗲𝘀𝘀, while there is another process (a "𝘀𝗲𝘀𝘀𝗶𝗼𝗻") for each connected client. The guild process tracks sessions of users who are members of that guild and are responsible for actions to those sessions. When sessions get updates, forward them to the web socket socket to the client.

The main issue is that 𝗮 𝘀𝗶𝗻𝗴𝗹𝗲 𝗺𝗲𝘀𝘀𝗮𝗴𝗲 𝗻𝗲𝗲𝗱𝘀 𝘁𝗼 𝗴𝗼 𝘁𝗼 𝘁𝗵𝗲 𝗻𝘂𝗺𝗯𝗲𝗿 𝗼𝗳 𝗽𝗲𝗼𝗽𝗹𝗲 𝗼𝗻𝗹𝗶𝗻𝗲 on that server, which means if a server has 1000 people online and they all send a message once, that's 1 million notifications.

So, how they solved it? 𝗧𝗵𝗲𝘆 𝗳𝗶𝗿𝘀𝘁 𝘁𝗿𝗶𝗲𝗱 𝘁𝗼 𝘂𝗻𝗱𝗲𝗿𝘀𝘁𝗮𝗻𝗱 𝗵𝗼𝘄 𝘁𝗵𝗲 𝘀𝘆𝘀𝘁𝗲𝗺 𝗽𝗲𝗿𝗳𝗼𝗿𝗺𝘀. They tracked what Elixir processes were doing, if they were stuck waiting on something, etc. They recorded the event types, how many of each kind of message they received, and their processing times. In addition, they tried to understand how much memory they use, the performances of garbage collectors, etc.

After the analysis, they 𝗰𝗿𝗲𝗮𝘁𝗲𝗱 𝘁𝗵𝗲 𝗳𝗼𝗹𝗹𝗼𝘄𝗶𝗻𝗴 𝘀𝘁𝗿𝗮𝘁𝗲𝗴𝘆:

𝟭. 𝗣𝗮𝘀𝘀𝗶𝘃𝗲 𝘀𝗲𝘀𝘀𝗶𝗼𝗻𝘀: Discord significantly reduced the amount of data processed and sent by differentiating between active and passive user connections, cutting the fanout work by 90% for large servers.

𝟮. 𝗥𝗲𝗹𝗮𝘆𝘀: Implementing a relay system (read - multithreading) allowed Discord to split the fanout process across multiple machines, enabling a single guild to utilize more resources and support more prominent communities. Relays maintain connections to the sessions instead of the guild and are responsible for doing fanout with permission checks.

𝟯. 𝗪𝗼𝗿𝗸𝗲𝗿 𝗽𝗿𝗼𝗰𝗲𝘀𝘀𝗲𝘀 𝗮𝗻𝗱 𝗘𝗧𝗦: To maintain server responsiveness, Discord employed worker processes and Erlang Term Storage (ETS) for operations requiring iteration over large sets of members, thus avoiding bottlenecks in the guild process. ETS is an in-memory database that supports the ability of multiple Elixir processes to access it safely. This enables the creation of a new worker process and passes the ETS table so this process can run expensive operations and offload the central guild server.

Read the full blog post in the comments.

Image source: Discord.

#technology #softwareengineering #programming #techworldwithmilan #systemdesign

[Roman Khan @RomanEcom]

We will buy close to $30,000,000 worth of goods from China this year with an average of 85 day payment terms blended.

These are 9 frequent mistakes I see founders make when sourcing from China 🧵