Even I have been writing C++ for over 10 years, I still miss a lot of basic syntax of C++. Today, I am about to cover pointer-to-member operator. See the standard expr.mptr.oper. It is hard to see ...

A funny thing happened yesterday. I tried to use memray to debug memory leak of a python service in production, but memray attach <pid> failed to work. The reason is that I did apt-get instal...

Before talking about Rust, let’s see what we have in C++. First, C++ has template. Compiler generates distinct binary code for each different instantiated template type. For example, template<ty...

Jenkins is one of the most sophisticated Java code bases I have ever read so far. I feel it is harder to read even than the Spring codebase. It is a combination of DSL parser, annotation processing...

Kernel vs User Space Kernel threads need memory as well. Where is it mapped to? In modern architecture, kernel and user virtual memory space are collocated. However, the same “kernel space” is map...

Two Cache Locations As an AWS sso user, I find two cache locations for authentication/authorization ~/.aws/sso/cache and ~/.aws/cli/cache. Example contents follow as below. $ cat ~/.aws/sso/cache...

In Vim, the bottom line where you type commands like :w, :q, or /pattern is called Command-line area. I use it everyday, but never know its exact syntax and how the interpreter works. This post is ...

Preconnection / Speculative Sockets I encountered the same problem documented in this post. What I observed using tcpdump was that the first time I opened a page in Chrome, two connections were es...

QBE is small, easy to build. $ make clean clean-gen $ bear -- make obj/qbe SSA [5] is the only paper needed to understand SSA. Liveness analysis Most my knowledge about liveness analysis come...

Build Follow the official doc. cd code git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git --depth=1 export PATH="$HOME/code/depot_tools:$PATH" mkdir chromium && c...