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

rgreenjr

-- show running queries (pre 9.2)
SELECT procpid, age(clock_timestamp(), query_start), usename, current_query 
FROM pg_stat_activity 
WHERE current_query != '<IDLE>' AND current_query NOT ILIKE '%pg_stat_activity%' 
ORDER BY query_start desc;

-- show running queries (9.2)
SELECT pid, age(clock_timestamp(), query_start), usename, query 
FROM pg_stat_activity 
WHERE query != '<IDLE>' AND query NOT ILIKE '%pg_stat_activity%' 

plentz

# to generate your dhparam.pem file, run in the terminal
openssl dhparam -out /etc/nginx/ssl/dhparam.pem 2048

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.

---

ryantrinkle

{-# LANGUAGE RecursiveDo, ScopedTypeVariables, FlexibleContexts #-}

import Reflex.Dom
import Data.Monoid
import Control.Monad
import Data.Map (Map)
import qualified Data.Map as Map

insertNew_ :: (Enum k, Ord k) => v -> Map k v -> Map k v
insertNew_ v m = case Map.maxViewWithKey m of

ali-abrar

import Reflex.Dom
import Data.Monoid

main :: IO ()
main = mainWidgetWithHead headWidget bodyWidget

headWidget = do
  elAttr "link" ("href" =: "https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css" <> "rel" =: "stylesheet" <> "type" =: "text/css") $ return ()

bodyWidget = do

khalwat

This is now part of craft-scripts:

https://github.com/nystudio107/craft-scripts

dmjio

class Webkitgtk24 < Formula
  desc "Full-featured Gtk+ port of the WebKit rendering engine"
  homepage "http://webkitgtk.org"
  url "http://webkitgtk.org/releases/webkitgtk-2.4.9.tar.xz"
  sha256 "afdf29e7828816cad0be2604cf19421e96d96bf493987328ffc8813bb20ac564"

  needs :cxx11

  # I would get ghc compilation errors from webkitgtk if video was not enabled
  # so this is kind pointless? maybe useful for other project, but I need it

CMCDragonkai

Short Circuiting Fold

This pretty much explains it: http://crypto.stanford.edu/~blynn/haskell/foldl.html here I just review the article.

The rule of thumb is this:

• if you want short circuiting on foldr, use a lazy on the right combiner
• if you want short circuiting on foldl, use a lazy on the left combiner

bmhatfield

# In order for gpg to find gpg-agent, gpg-agent must be running, and there must be an env
# variable pointing GPG to the gpg-agent socket. This little script, which must be sourced
# in your shell's init script (ie, .bash_profile, .zshrc, whatever), will either start
# gpg-agent or set up the GPG_AGENT_INFO variable if it's already running.

# Add the following to your shell init to set up gpg-agent automatically for every shell
if [ -f ~/.gnupg/.gpg-agent-info ] && [ -n "$(pgrep gpg-agent)" ]; then
    source ~/.gnupg/.gpg-agent-info
    export GPG_AGENT_INFO
else