由于我要去参加十月份在北美丹佛的 ApacheCon，因此有了第一次去美国的机会。签证是第一步，有些朋友可能会 找中介代理，通过我把流程走完来看，必要性不是很大，最麻烦的 DS-160 表格网上也有不少攻略可供参考。趁着 昨天面签刚通过，抓紧来记录一下要点，帮助大家成功拿到十年美签！

Much of the advice I see online targeted at “developers” is really bad. And the funny thing is: it is bad advice, even if it is completely true.

That’s because in developers’ minds, it is very easy to say that a “developer” is someone who does the same things I do. But in practice, there are many kinds of developers, focusing on drastically different problems.

Much of the advice online takes the form of “who needs this anyway?”. As a quick detour, that is one of the reasons I appreciate ThePrimeagen so much: he is the rare kind of influencer that is always happy to take a step back, and invite his audience to ask “ok, let’s understand the problem and the domain first”, as opposed to “whoever is doing this or that is doing it wrong”.

I have spent almost the entire last decade in a fairly specialized product company, building high performance I/O systems. I had the opportunity to see storage technology evolve rapidly and decisively. Talking about storage and its developments felt like preaching to the choir.

This year, I have switched jobs. Being at a larger company with engineers from multiple backgrounds I was taken by surprise by the fact that although every one of my peers is certainly extremely bright, most of them carried misconceptions about how to best exploit the performance of modern storage technology leading to suboptimal designs, even if they were aware of the increasing improvements in storage technology.

利用年后换工作之际，在 3月16号–25号这九天时间出去和女朋友浪了一圈，由于是临时起意的旅行，所以找了个近的地方——泰国，主要是芭提雅、曼谷这两个中部城市。虽然时间比较长，但是在攻略方面也没规划的很详细，基本上是提前一两天确定处理，这样也不耽误购买淘宝上的一日游项目（一般需提前一天预定）。

写在前面：18年清明节阳澄湖骑行半日游

清明节一方面是纪念先人，另一方面是春游踏青，而且这几天气温回升的快，已经到了二十多度，小区路边桃树的花骨朵也都跃跃欲试、呼之欲出，终于可以摆脱冬天的束缚，去拥抱那温暖和煦的春姐姐。

如图所示，两次都是 0 分，原因都差不多，

• 第一次是中途熄火后，重新启动时档位没有调到空档，扣 100 分；
• 第二次是在红绿灯前等待，绿灯亮起开始起步时，本应该挂一档起步结果挂到了三档上，结果导致在人行道上熄火，直接扣 100 分

最近在写 Zig 时遇到一个奇怪的 bus error，下面是简化后的代码：

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fn foo(arr: *[3]u8) void {
 arr[0] = 100;
}

pub fn main() !void {
 const arr: [3]u8 = .{ 1, 2, 3 };
 foo(@constCast(&arr));
}

直接 zig run main.zig 执行，会报错：

Victoria Metrics 是一个功能强大且易于使用的时序数据库，它之所以能够在众多的 TSDB 中脱颖而出，主要得益于其强劲的性能，和简单的部署模式，本篇文章就结合其源码，来分析其写入流程，看看它是如何解决高基数下的高吞吐。

最近看到不少朋友分享使用 Cloudflare 的各种心得，中转邮箱、图床、CDN 等等不一而足，甚至有一个 awesome-cloudflare 的仓库，里面收集了各种基于 Cloudflare （免费）服务实现的各种工具，“赛博菩萨”名不虚传。