andi AndrewTsao

Docker Hub 镜像加速器

国内从 Docker Hub 拉取镜像有时会遇到困难，此时可以配置镜像加速器。

Dockerized 实践 https://github.com/y0ngb1n/dockerized

1️⃣ Docker daemon 配置代理（推荐）

参考 Docker daemon 配置代理

Installing Powerline fonts on Windows 10

Steps

Download and extract zip from here
Press Windows + x
Press a (Selects PowerShell (Admin))
Navigate to directory where fonts were extracted to (cd ${HOME}\Downloads\fonts-master\fonts-master)
Set Execution Policy Set-ExecutionPolicy RemoteSigned [1]
Press y then Enter to accept

Download CMake from: https://cmake.org/download/

wget https://cmake.org/files/v3.12/cmake-3.12.3.tar.gz

Compile from source and install

tar zxvf cmake-3.*

MessagePack update proposal v5

# MessagePack specification

MessagePack is an object serialization specification like JSON.

MessagePack has two concepts: type system and formats. Serialization is conversion from application types into MessagePack formats via MessagePack types. Deserialization is conversion from MessagePack formats into application types via MessagePack types.

Serlialization:

The Basics

Every stream has two basic parts

data-in - A chunk or EOF enters the stream
data-out - A chunk or EOF leaves the stream

I'm combining both "data" and "end" events since "end" is just a special data packet signifying the end of the stream.

Flow Control

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

	#!/usr/bin/env sh

	set -euv

	# Updated on April 2019 to reflect changes in GN
	# See:
	# https://github.com/ninja-build/ninja
	# https://gn.googlesource.com/gn/

	# We need a recent git

	Latency Comparison Numbers (~2012)
	----------------------------------
	L1 cache reference 0.5 ns
	Branch mispredict 5 ns
	L2 cache reference 7 ns 14x L1 cache
	Mutex lock/unlock 25 ns
	Main memory reference 100 ns 20x L2 cache, 200x L1 cache
	Compress 1K bytes with Zippy 3,000 ns 3 us
	Send 1K bytes over 1 Gbps network 10,000 ns 10 us
	Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD