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@searls
searls / Email.java
Created March 10, 2011 15:12
An example of behavior verification + argument capture with Mockito (on TestNG)
package com.pillartechnology.mail;
import java.util.Date;
public class Email {
private String domain;
private String user;
private String body;
@jboner
jboner / latency.txt
Last active July 17, 2024 03:12
Latency Numbers Every Programmer Should Know
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
@hofmannsven
hofmannsven / README.md
Last active July 16, 2024 01:30
Git CLI Cheatsheet
@Kartones
Kartones / postgres-cheatsheet.md
Last active July 17, 2024 05:41
PostgreSQL command line cheatsheet

PSQL

Magic words:

psql -U postgres

Some interesting flags (to see all, use -h or --help depending on your psql version):

  • -E: will describe the underlaying queries of the \ commands (cool for learning!)
  • -l: psql will list all databases and then exit (useful if the user you connect with doesn't has a default database, like at AWS RDS)
@psayre23
psayre23 / gist:c30a821239f4818b0709
Last active June 27, 2024 17:48
Runtime Complexity of Java Collections
Below are the Big O performance of common functions of different Java Collections.
List | Add | Remove | Get | Contains | Next | Data Structure
---------------------|------|--------|------|----------|------|---------------
ArrayList | O(1) | O(n) | O(1) | O(n) | O(1) | Array
LinkedList | O(1) | O(1) | O(n) | O(n) | O(1) | Linked List
CopyOnWriteArrayList | O(n) | O(n) | O(1) | O(n) | O(1) | Array
@martinrusev
martinrusev / cron_supervisord.ini
Last active June 1, 2024 03:27
Cron supervisord
[supervisord]
nodaemon=true
loglevel=debug
[program:amon]
command=gunicorn -c gunicorn.conf.py wsgi
directory=/amon
autostart=true
autorestart=true
redirect_stderr=true
@jarrad
jarrad / install-kafka.txt
Last active July 14, 2024 15:09
Install Kafka on OSX via Homebrew
$> brew cask install java
$> brew install kafka
$> vim ~/bin/kafka
# ~/bin/kafka
#!/bin/bash
zkServer start
kafka-server-start.sh /usr/local/etc/kafka/server.properties
@PurpleBooth
PurpleBooth / README-Template.md
Last active July 17, 2024 03:47
A template to make good README.md

Project Title

One Paragraph of project description goes here

Getting Started

These instructions will get you a copy of the project up and running on your local machine for development and testing purposes. See deployment for notes on how to deploy the project on a live system.

Prerequisites

@squarism
squarism / iterm2.md
Last active July 17, 2024 05:55
An iTerm2 Cheatsheet

Tabs and Windows

Function Shortcut
New Tab + T
Close Tab or Window + W (same as many mac apps)
Go to Tab + Number Key (ie: ⌘2 is 2nd tab)
Go to Split Pane by Direction + Option + Arrow Key
Cycle iTerm Windows + backtick (true of all mac apps and works with desktops/mission control)