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

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

MohamedAlaa

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

jordelver

Set the Mac OS X SOCKS proxy on the command line

a.k.a. what to do when your ISP starts blocking sites :(

Set the SOCKS proxy to local SSH tunnel

networksetup -setsocksfirewallproxy "Ethernet" localhost 8080

To clear the domain and port

dflock

[
    // Auto-pair underscores
    { "keys": ["_"], "command": "insert_snippet", "args": {"contents": "_$0_"}, "context":
        [
            { "key": "setting.auto_match_enabled", "operator": "equal", "operand": true },
            { "key": "selection_empty", "operator": "equal", "operand": true, "match_all": true },
            { "key": "following_text", "operator": "regex_contains", "operand": "^(?:\t| |\\)|]|\\}|>|$)", "match_all": true },
            { "key": "preceding_text", "operator": "not_regex_contains", "operand": "[_a-zA-Z0-9_]$", "match_all": true },
            { "key": "eol_selector", "operator": "not_equal", "operand": "string.quoted.underscore", "match_all": true }
        ]

marcoarment

/*  parallelize: reads commands from stdin and executes them in parallel.

    The sole argument is the number of simultaneous processes (optional) to
      run. If omitted, the number of logical CPUs available will be used.
    
    Build: gcc -pthread parallelize.c -o parallelize
    
    Demo: (for i in {1..10}; do echo "echo $i ; sleep 5" ; done ) | ./parallelize
    
    By Marco Arment, released into the public domain with no guarantees.

avalonalex

# Thanks to this post:
# http://blog.ikato.com/post/15675823000/how-to-install-consolas-font-on-mac-os-x

$ brew install cabextract
$ cd ~/Downloads
$ mkdir consolas
$ cd consolas
$ curl -O http://download.microsoft.com/download/f/5/a/f5a3df76-d856-4a61-a6bd-722f52a5be26/PowerPointViewer.exe
$ cabextract PowerPointViewer.exe
$ cabextract ppviewer.cab

thomas-holmes

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

beechnut

// Copy the following into Preferences > Key Bindings -- User
// Thanks to:
// http://sublimetext.userecho.com/topic/86166-backtick-quoting-selected-text-does-not-work-like-single-quotes-and-double-quotes/

[
    // Auto-pair backticks
  { "keys": ["`"], "command": "insert_snippet", "args": {"contents": "`$0`"}, "context":
    [
      { "key": "setting.auto_match_enabled", "operator": "equal", "operand": true },
      { "key": "selection_empty", "operator": "equal", "operand": true, "match_all": true },

command-tab

#!/bin/bash

# Based in part on https://wincent.com/wiki/Fixing_the_baseline_on_the_Consolas_font_on_OS_X

function fail()
{
  local error=${1:-Unknown error}
  echo "Failed! $error"
  exit 1
}