Reading Time: 4 minutes (Below is from a tweet/X thread I wrote last year) #Performance testing is important. At the same time, we don’t want to the performance tuning too early, or set an unrealistic performance goal. A better way in my opinion is to tune/optimize the app (or web services) performance as it scales up (getting more users).

Reading Time: 4 minutes On Oct 13, 2015, I bought this Martian Watches Notifier Smartwatch – White from Amazon ($50). Note this is just a notification watch, and it can send the text message from phone to my watch. The reason I wanted it is because at that time, I was worried I could miss the text message over

Reading Time: 2 minutes Things to pay attention when we are over 50 (I borrowed this paragraph from a high school classmate in mailand CHN) 我来说几句吧，不妥之处请大家指正：1. 一定要有医保，有能力的可以适当配点商业保险 2. 同学们都巳年过半百了，各种慢性病会慢慢出来，应该学习一点医学常识。个人建议关注以下几个（微信）公众号： 丁香医生/ 菠萝因子/ 营养师顾中一 Below is my own cooking Exercise 锻炼身体：running, jogging, and walking 跑步，慢跑，走路 are all good. Many other good cardiovascular exercise 心血管运动 include cycling, swimming, and tennis. Take your

Reading Time: < 1 minute 在2019年之前，我大概有二十年没有割草了。从1998年一月到1999年七月，我住在罗拉的美国大学生的兄弟会(Wikipedia fraternity; interestingly I joined the Delta Tau Delta fraternity (Epsilon Nu chapter) which is shown in the image when you do google search). 我在兄弟会的时候割过几次草。兄弟会有duty, 翻译成中文大概是值日值班的意思，我的任务里有不少是洗碗，偶尔也有割草。兄弟会是汽油的传统割草机：会有汽油的味道。印象最深的一次是大概是98年的夏天，兄弟会后面有较大的草地，我们一开始没有割草，后来发现有（不太友好的）邻居把我们举报了。马路对面的美国邻居是较友好的，我印像中他叫Bob May, 他告诉我们这个事。后来我们兄弟会有能力的美国小兄弟，去租了一个可以坐上去的割草机，把后面的草给割了。 我2000年十月份来圣路易斯以后，一直住公寓和康斗(Condo, 相当于买下来的公寓), 就不用担心割草的事。一直到19年夏天，搬到现在的独门独户的房子。 我一开始在亚马逊上买了这个 Greenworks 40V 16″ Cordless (Push) Lawn Mower，用了几年，效果还可以。一直到去年（2023年）春夏天，第一次割草时感觉很卡，割两下就熄火Shutdown. 我想两百多块的钱，用了快四年，也值了本了。正好在Costco 看到这个马力大的 Greenworks 80V 21″ Gen 2 Self-Propelled Mower, 还打折，就跳了。事后想想，打折的东西要稍加小心，也许有坑。 后来发现确实有坑：这个割草机的好处是马力大，也有自推的功能。她的缺点是一个电池基本上是坏的，还有她在草较长的时候也同样熄火。最近我联系了厂家，换了个电池。但是总的来说，她家说充满电一次可以割 0.75 acre 是达不到的。我家的院子大概是 0.28 acre,

Reading Time: < 1 minute 好像有个说法，人生在于折腾。 Zhihu: 人生的意义在于折腾 晚读 | 人生在于折腾，而不是年纪轻轻趋于平静 (新黄河 via qq.com) 我想对年轻人来说，这个基本上是适用的。比如说前几年流行的创业，我们年轻时（大学毕业时，九十年代初）去南方，广东，深圳等。With some exceptions, of course. The main thing is we all need to listen to our body – doesn’t matter whether one is young or old. We want to avoid things like below Another death at BoA (X)? A 25-year-old Bank of America credit trader died

Reading Time: 4 minutes Or ransomware as a service or RaaS, please refer to this Pensacola News Journal article, search for “Black Basta” for the detailed information. I felt this article was well written. Unfortunately, this one is the place I used to work – Ascension Health (company official note on this cyber security event). I also talked about

Reading Time: 2 minutes A math (algebra) visualization tool – mathway Bumped into it as this morning my 14 year old asked me a question related to this. Her question is about the “parabola shape and formula”, or how they become narrow or wide. For me I think I probably learned this about 40 years ago (at my 6th

Reading Time: 11 minutes 中文版 – 谷歌翻译 – 美国上班20多年用过的那些电脑 I started working in the US since Oct 2000. In a few years, hopefully I can retire from my current software dev job on my own terms (rather than let’s just say being replaced by AI :-). When I 1st started to working in the US, back in year 2000,

Reading Time: 2 minutes I talked about arbitrage quite a bit in my blog, but in terms of profit I didn’t make much until year 2022 – I followed Warren Buffett and bought into Microsoft Activision Blizzard acquisition. I got this idea when I attended #BRK2022 shareholder meeting in Omaha, Nebraska. Most recently, I speculated a few more, one

Reading Time: 2 minutes cobble together per Collins Dictionary: If you say that someone has cobbled something together, you mean that they have made or produced it roughly or quickly. Or Google AI overview – “Cobble together” is an American English phrasal verb that means to produce something quickly or roughly, often without great care or effort. For example,