A little container knowledge every day! — In my previous articles we learned how to build Docker images and run a container from the built image. In this article, let’s discuss aBoUt the various operations of containers, how to transition between various states of containers and the underlying technologies. Run Container As I mentioned earlier, docker run is the…

Advanced skills of troubleshooting High CPU usage — Through the study of load average and CPU context switching in my previous two articles: “Linux CPU Context Switch Deep Dive”, “Linux CPU Context Switch Troubleshooting”, I believe you have a preliminary understanding of CPU performance. But what metrics do you use most to troubleshoot high CPU usages? CPU Usage The CPU…

Learn the magic of Python decorator — Decorators have always been a useful and classic feature in Python, and they are widely used in projects, such as logging, caching and other tasks. However, in daily work and life, I find that many people, especially beginners, are often intimidated by decorators because of their relatively complex representation, thinking…

How to troubleshoot CPU context switch — In my last article: “Linux CPU Context Switch Deep Dive”, I talked about how CPU context switching works. A quick review, CPU context switch is a core function to ensure normal operations of Linux system. It can be divided into “process context switch”, “thread context switch” and “interrupt context switch”. …

Do you think += and + are the same? — As a Python programmer, you probably use Python list on a daily basis, but can you explain the output of the following code snippet? l1 = [1, 2, 3] l2 = l1 l1 += [4] print(l1) print(l2) l1 = l1 +[5] print(l1) print(l2) The first two print statement will output: …

How are parameters passed in Python? — It is important to understand the parameter passing mechanism in Python, which often allows us to make fewer mistakes and improve efficiency when writing code. Pass-by-value vs Pass-by-reference If you have other programming language background, such as C/C++, it is easy to understand that there are two common types of parameter passing: pass-by-value…

How much do you know about CPU context switch? — We all know that Linux is a multitasking OS, which supports simultaneous running of tasks far greater than the number of CPUs. …

Do you really understand load average? Every time we find that system is slow, the first thing we usually do is to run the top or uptime command to understand the load of the system, for example: $ uptime 02:34:03 up 2 days, 20:14, 1 user, load average: 0.63…

Learn the basics of Python object comparison and copy — In my previous articles, we have seen many examples of Python object comparison and copy, such as the following statement: if a == b: ... and l1 = [1, 2, 3] l2 = list(l1) But can you answer the following questions? Is l2 a shallow copy or a deep copy…