gist:4263758

# General gigabit tuning:
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216
net.ipv4.tcp_rmem = 4096 87380 16777216
net.ipv4.tcp_wmem = 4096 65536 16777216
net.ipv4.tcp_syncookies = 1
# this gives the kernel more memory for tcp
# which you need with many open socket connections
net.ipv4.tcp_mem = 50576   64768   98152
net.core.netdev_max_backlog = 2500

aledbf

var program = require('commander'),
    request = require('request'),
    fs = require('fs'),
    ursa = require('ursa');

program.on('--help', function() {
  console.log('  Alternative to https://gist.github.com/fbb99b638e9da27fe24d (generate secure environment variables)');
  console.log('  Example:');
  console.log('');
  console.log('    $ node index -r github-user/user-repo -v SECURE=value');

masonforest

Installing a Gem on Heroku from a Private GitHub Repo

Sometimes you want to use a gem on Heroku that is in a private repository on GitHub.

Using git over http you can authenticate to GitHub using basic authentication. However, we don't want to embed usernames and passwords in Gemfiles. Instead, we can use authentication tokens.

1. Get an OAuth Token from GitHub

---

First you will need to get an OAuth Token from GitHub using your own username and "note"

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

stormsilver

bash -c '
<%= "export http_proxy=\"#{knife_config[:bootstrap_proxy]}\"" if knife_config[:bootstrap_proxy] -%>

if [ ! -f /usr/bin/chef-client ]; then
  apt-get update
  apt-get install -y ruby1.9.1 ruby1.9.1-dev build-essential wget
  cd /tmp
  wget <%= "--proxy=on " if knife_config[:bootstrap_proxy] %>http://production.cf.rubygems.org/rubygems/rubygems-1.8.15.tgz
  tar zxf rubygems-1.8.15.tgz
  cd rubygems-1.8.15

kommen

Patched ruby 1.9.3-p125 for 30% faster rails boot

What is?

This script installs a patched version of ruby 1.9.3-p125 with patches to make ruby-debug work again (#47) and boot-time performance improvements (#66 and #68), and runtime performance improvements (#83 and #84).

It works with Xcode 4.3 and the clang compiler it ships with its command line tools package.

Huge thanks to funny-falcon for the performance patches.

eric

require 'lazy'
require 'system_timer'

class LibratoMetric
  COUNT      = 10
  RESOLUTION = 1

  def initialize(metric_name, timeout = 5)
    @metric_name = metric_name
    @timeout     = timeout

kellymclaughlin

Fun = fun(C, File) ->
                  {ok, TLObj} = C:get(<<"luwak_tld">>, File, 2),
                  {_, TLVal} = hd(riak_object:get_contents(TLObj)),
                  FileRoot = proplists:get_value(root, TLVal),
                  {ok, RootObj} = C:get(<<"luwak_node">>, FileRoot),
                  {_, RootVal} = hd(riak_object:get_contents(RootObj)),
                  {_, _, ChunkKeys} = RootVal,
                  [begin
                       case C:get(<<"luwak_node">>, K) of
                           {ok, _} ->

dsanson

/*
 This is my hacked up copy of Marked.app/Contents/Resources/gridless.css

 Changes:

 1. Smaller headings
 2. ~~No scrollbars~~ (I now prefer the Lion default behavior)
 3. Styling of definition lists ala LaTeX description lists.
 4. Centering h1.title, h3.author, h4.date (pandoc's title/author/date block).
 

jdmaturen

import logging
log = logging.getLogger('socrates')

from Queue import Empty, Full, Queue

from riak.transports import RiakPbcTransport
from riak.transports.transport import RiakTransport


class PbcPoolTransport(RiakTransport):