Ben Chuanlong Du's Blog

It is never too late to learn.

Latency Numbers Programmers Should Know

Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement!

Latency Operations
<=1ns
  • accessing CPU registers
  • CPU clock cycle
  • L1 cache
1-10ns
  • L2 cache
  • branch mispredict
10-100ns
  • L3 cache
  • mutex lock/unlock
  • main memory referencing
100-1000ns
  • trapping of system call
  • md5 …

The NeoVim Plugin for Visual Studio Code

Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement!

https://github.com/asvetliakov/vscode-neovim

Installation

  1. Install NeoVim 0.5+ using icon.

    icon nvim -ic --ppa

  2. Install the NeoVim plugin from the extension market in VSCode or Code Server.

  3. Set the …

Tips on ChromeOS

Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement!

Shortcut Description
ctrl + shift + + Increase size of tabs.
ctrl + shift + + Decrease size of tabs.
ctrl + + Zoom in a page.
ctrl + - Zomm out a page.

No BLAS or LAPACK Found When Installing Scipy

Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement!

To build Scipy from sources, BLAS & LAPACK libraries need to be installed. See site.cfg.example in the Scipy source directory and

sudo apt-get install gfortran libopenblas-dev liblapack-dev

The dependency requires …