jboner

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

djspiewak

Thread Pools

Thread pools on the JVM should usually be divided into the following three categories:

1. CPU-bound
2. Blocking IO
3. Non-blocking IO polling

Each of these categories has a different optimal configuration and usage pattern.

timvisee

Falsehoods programmers believe about time

This is a compiled list of falsehoods programmers tend to believe about working with time.

Don't re-invent a date time library yourself. If you think you understand everything about time, you're probably doing it wrong.

Falsehoods

• There are always 24 hours in a day.
• February is always 28 days long.
• Any 24-hour period will always begin and end in the same day (or week, or month).

ErikAugust

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#ifdef _MSC_VER
#include <intrin.h> /* for rdtscp and clflush */
#pragma optimize("gt",on)
#else
#include <x86intrin.h> /* for rdtscp and clflush */
#endif

katef

#!/usr/bin/awk -f

# This program is a copy of guff, a plot device. https://github.com/silentbicycle/guff
# My copy here is written in awk instead of C, has no compelling benefit.
# Public domain. @thingskatedid

# Run as awk -v x=xyz ... or env variables for stuff?
# Assumptions: the data is evenly spaced along the x-axis

# TODO: moving average

markjaquith

function subl() {
	if [[ ! -p /dev/stdin ]]; then
		command subl > /dev/null 2>&1
	fi
	command subl "$@"
}

enricofoltran

package main

import (
	"context"
	"flag"
	"fmt"
	"log"
	"net/http"
	"os"
	"os/signal"

zacharycarter

Binding to C Libraries with Nim

---

Table of Contents

• Introduction
• C2Nim
• The C Preprocessor
• Pragmas

aaronzirbes

#!/bin/bash

echo "Finding and Purging Big Files From Git History"
echo "=============================================="
echo ""
echo "http://naleid.com/blog/2012/01/17/finding-and-purging-big-files-from-git-history/"
echo ""

pushd "$(git rev-parse --show-toplevel)" > /dev/null

mamund

/************************************************
  Retrieve a JWT from Auth0 for Postman

  2020-05-15 : @mamund @greatwebapis
  
  NOTES:
    1) create API definition in Auth0 with
      "client_credential" (machine-to-machine)
    2) pull the following from Auth0 API config:
      - domain