John Nelson johncoder

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

Moved to git repository: https://github.com/denji/golang-tls

Generate private key (.key)

# Key considerations for algorithm "RSA" ≥ 2048-bit
openssl genrsa -out server.key 2048

# Key considerations for algorithm "ECDSA" ≥ secp384r1
# List ECDSA the supported curves (openssl ecparam -list_curves)

Conquering Kubernetes with Emacs

Specific Annoying workflow

Listing pods with kubectl get pods, then select a pod name and copy paste it into kubectl logs [pod name]

Why?

I want to streamline my workflow and stop using the terminal
learn more about kubernetes
main kubernetes extension for Emacs out there is greedy for permissions

	var fs = require('fs');
	var path = require('path');

	if (typeof exports === 'undefined') var exports = {};

	exports.exists = function(filename) {
	try {
	return (fs.lstatSync(filename) ? true : false);
	}
	catch (err) {

	public class Analytics
	{
	// Tracker version.
	private const string Version = "4.4sa";

	private const string CookieName = "__utmmobile";

	// The path the cookie will be available to, edit this to use a different
	// cookie path.
	private const string CookiePath = "/";

	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

	public class MvcApplication : System.Web.HttpApplication
	{
	protected void Application_Start()
	{
	...
	ViewEngines.Engines.Clear();
	ViewEngines.Engines.Add(this.GetRazorViewEngine());
	}

	private RazorViewEngine GetRazorViewEngine()

	version: '3'

	services:
	eventstore:
	container_name: geteventstore
	image: eventstore/eventstore
	ports:
	- "2113:2113"
	- "1113:1113"
	volumes:

	package main

	import (
	"bufio"
	"bytes"
	"encoding/binary"
	"encoding/json"
	"flag"
	"fmt"
	"io"

	# this script queries aws logs with insights filtering on ERROR

	# explanation of start and end times
	#--start-time = unix timestamp 30 mins in the past
	#--end-time = unix timestamp now

	QUERY_ID=$(aws logs start-query \
	--profile $profile \
	--log-group-name /aws/lambda/aap-event-consumer-dev \
	--start-time `date -v-30M "+%s"` \