Rob robbyrob42

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

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

Ubuntu 16.04 on AWS EC2

This guide enables desktop mode in Ubuntu 16.04 (Xenial Xerus) running off an AWS EC2.

Setup

Launch an EC2 instance with Ubuntu 16.04 (should work on all versions greater too)
Ensure a security group is configured, that allows ingress on ports 22 (SSH) and 5901 (VNC, 5900+N, where N is the display number)
SSH into the instance, update the system, install the XFCE desktop and the lightweight VNC server:

VALIDATE VISUALFORCE DOMAIN IS READY

Have you ever created a new scratch org with sfdx but seem to have trouble access visualforce pages? This seems to be a know issue and can take 0-18 minutes before the org is fully operational. This random delay can cause havoc on e2e/integration testing as well as unit test. So after many attempts to fix or delay CI/CD I believe I have finally found a solution.

First let's talk about the actual issue, spinning up a new scratch org. After running sfdx force:org:create you will receive a success message along with login/password info for your org. The core sfdc features of the org are almost ready instantly but if you have a managed package with namespace it takes 0-18 minutes. Navigating to one of these pages(vf pages) will not error with a 404 nor will they timeout. However it will load a blank screen so let's dig in a bit 😺

	require "rubygems"
	require "twitter"
	require "json"

	# things you must configure
	TWITTER_USER = "your_username"
	MAX_AGE_IN_DAYS = 1 # anything older than this is deleted

	# get these from dev.twitter.com
	CONSUMER_KEY = "your_consumer_key"

	#!/bin/bash

	libs=( "/usr/local/lib/libmacfuse_i32.2.dylib" \
	"/usr/local/lib/libosxfuse_i32.2.dylib" \
	"/usr/local/lib/libosxfuse_i64.2.dylib" \
	"/usr/local/lib/libmacfuse_i64.2.dylib" \
	"/usr/local/lib/libosxfuse_i32.la" \
	"/usr/local/lib/libosxfuse_i64.la" \
	"/usr/local/lib/pkgconfig/osxfuse.pc" )

	<!DOCTYPE html>
	<html>
	<head>
	<title>Intro to JavaScript!</title>

	<style>
	body {
	background: #fbfbfb;
	}
	.container {

	// Copy-paste from https://keen.io/docs/clients/javascript/usage-guide/#js-install-guide
	var Keen=Keen \|\|{configure:function(e){this._cf=e},addEvent:function(e,t,n,i){this._eq=this._eq\|\|[],this._eq.push([e,t,n,i])},setGlobalProperties:function(e){this._gp=e},onChartsReady:function(e){this._ocrq=this._ocrq\|\|[],this._ocrq.push(e)}};(function(){var e=document.createElement("script");e.type="text/javascript",e.async=!0,e.src=("https:"==document.location.protocol?"https://":"http://")+"dc8na2hxrj29i.cloudfront.net/code/keen-2.1.0-min.js";var t=document.getElementsByTagName("script")[0];t.parentNode.insertBefore(e,t)})();

	// readKey is not required for this example
	Keen.configure({
	projectId: "your_project_id",
	writeKey: "your_write_key",
	readKey: "your_read_key"
	});

	/**
	* Copyright (c) 2013, Andrew Fawcett
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without modification,
	* are permitted provided that the following conditions are met:
	*
	* - Redistributions of source code must retain the above copyright notice,
	* this list of conditions and the following disclaimer.
	* - Redistributions in binary form must reproduce the above copyright notice,

	String csv = 'Id,Name\n';
	for ( List<Account> accts : [ SELECT id, name FROM Account LIMIT 10 ] ) {
	for ( Account acct : accts ) {
	csv += acct.id + ',' + acct.name.escapeCsv() + '\n';
	}
	}

	ContentVersion file = new ContentVersion(
	title = 'accounts.csv',
	versionData = Blob.valueOf( csv ),