hellerbarde

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

czottmann

#### Issue description



#### Steps to reproduce the issue

1.  
2. 
3. 

h0tw1r3

continue
dir=/var/www/downloads
file-allocation=falloc
max-connection-per-server=4
max-concurrent-downloads=2
max-overall-download-limit=0
min-split-size=25M
rpc-allow-origin-all=true
rpc-secret=YouShouldChangeThis
input-file=/var/tmp/aria2c.session

staltz

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

---

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

---

wen-long

摘译自 robots.thoughtbot.com

launchctl 命令加载，卸载开机自动运行的服务，在 OS X 中，服务本身存储在 .plist 文件中（即 property list），这些文件的位置一般在 ~/Library/LaunchAgents 或 /Library/LaunchAgents。可以使用 launchctl load $PATH_TO_LIST 和 unload them with launchctl unload $PATH_TO_LIST 命令来加载/卸载他们。加载就是允许这个程序开机执行，卸载反之。

如果你使用 Homebrew 安装过 mysql 那么下面的安装后提示你可能比较熟悉

To have launchd start mysql at login:
   ln -sfv /usr/local/opt/mysql/*.plist ~/Library/LaunchAgents
Then to load mysql now:

subfuzion

Common Options

-#, --progress-bar Make curl display a simple progress bar instead of the more informational standard meter.

-b, --cookie <name=data> Supply cookie with request. If no =, then specifies the cookie file to use (see -c).

-c, --cookie-jar <file name> File to save response cookies to.

lopspower

Hexadecimal color code for transparency

How to set transparency with hex value ?

For example, you want to set 40% alpha transparence to #000000 (black color), you need to add 66 like this #66000000.

Download This sample on Google Play Store

matchaxnb

<?xml version="1.0" standalone='no'?>
<!DOCTYPE service-group SYSTEM "avahi-service.dtd">
<service-group>
 <name replace-wildcards="yes">%h</name>
 <service>
   <type>_adisk._tcp</type>
   <txt-record>sys=waMa=0,adVF=0x100</txt-record>
   <txt-record>dk0=adVN=Time Capsule,adVF=0x82</txt-record>
 </service>
  <service>

maxim5

#!/usr/bin/env python
# -*- coding: utf-8 -*-

from __future__ import print_function

__author__ = 'maxim'

import numpy as np
import gensim
import string

rsms

figma.showUI(`<script>
  let imurl = 'https://66.media.tumblr.com/7af65560449c91e8cd82a4a3478f5e0b/tumblr_pb7bt5CTrS1qzdllao1_1280.jpg'
  fetch(imurl).then(r => r.arrayBuffer()).then(a =>
    parent.postMessage({ pluginMessage: ["imdata", new Uint8Array(a)] }, '*'))
</script>`, { visible:false, width:200, height:200 })
figma.ui.onmessage = msg => {
  if (msg[0] == "imdata") {
    let data = msg[1] as Uint8Array
    let imageHash = figma.createImage(new Uint8Array(data)).hash
    const rect = figma.createRectangle()