Picking the right architecture = Picking the right battles + Managing trade-offs
| 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 |
| function TaskRunner(concurrency) { | |
| this.concurrency = concurrency; | |
| this.currentTasksRunning = 1; | |
| this.tasks = []; | |
| } | |
| TaskRunner.prototype.executor = function () { | |
| //0 []; | |
| //1 []; | |
| //2 []; |
| #!/bin/bash -i | |
| #using shebang with -i to enable interactive mode (auto load .bashrc) | |
| set -e #stop immediately if any error happens | |
| # Install Open SDK | |
| apt update | |
| apt install openjdk-8-jdk -y | |
| update-java-alternatives --set java-1.8.0-openjdk-amd64 | |
| java -version |
| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8" /> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0" /> | |
| <meta http-equiv="X-UA-Compatible" content="ie=edge" /> | |
| <title>Stars</title> | |
| <style> | |
| .one { | |
| display: flex; |
| { | |
| // See http://go.microsoft.com/fwlink/?LinkId=827846 to learn about workspace recommendations. | |
| "recommendations": [ | |
| "visualstudioexptteam.vscodeintellicode", | |
| "esbenp.prettier-vscode", | |
| "ms-vscode.vscode-typescript-tslint-plugin", | |
| "ms-azuretools.vscode-docker", | |
| "editorconfig.editorconfig" | |
| ], | |
| "unwantedRecommendations": [ |
| /** | |
| * jQuery 2.1.3's parseHTML (without scripts options). | |
| * Unlike jQuery, this returns a DocumentFragment, which is more convenient to insert into DOM. | |
| * MIT license. | |
| * | |
| * If you only support Edge 13+ then try this: | |
| function parseHTML(html, context) { | |
| var t = (context || document).createElement('template'); | |
| t.innerHTML = html; | |
| return t.content.cloneNode(true); |
| // http://pop.frontendweekly.co/5i5tEf?utm_campaign=Frontend%2BWeekly&utm_medium=email&utm_source=Frontend_Weekly_126 | |
| class Base { | |
| static get foo() { | |
| return this._foo; | |
| } | |
| static set foo(foo) { | |
| this._foo = foo; | |
| } | |
| } |
| var pullrefresh = { | |
| /*++++++++++++++ 初始化 +++++++++++++*/ | |
| init: function (data) { | |
| var self = this; | |
| this.generatedCount = 0; | |
| document.addEventListener('DOMContentLoaded', function () { | |
| setTimeout(function () { |
