aaronblohowiak

Redisconf Notes:

"We will begin this morning with a performance"
	"Is this a key store..." Bohemian Rhapsody Key/Value Store ballad.  Epic Win!
	"Any way the data flows doesn't really matter to me... flushdb..."
	"Lua killed a db by writing after calling a nondeterministic function..."
	"Got to leave SQL behind and face the truth..."
	"Redis, I don't want to join, sometimes I wish I'd never described a query..."
	"The ZSET has some data set aside for me, for me, for MEEEEEEE"

jaseg

Prelude

Since password managers are big and complicated and I currently am pretty bored since I am sitting in a car for a few hours, here is a simple algorithm to generate resource-specific, unique passwords using a master password and no password database.

WARNING

As pointed out here: http://news.ycombinator.com/item?id=4374888 this method is broken.

Usage

josephwecker

#!/bin/bash
# License: Public Domain.
# Author:  Joseph Wecker, 2012
#
# -- DEPRICATED --
# This gist is slow and is missing .bashrc_once
# Use the one in the repo instead! https://github.com/josephwecker/bashrc_dispatch
# (Thanks gioele)
#
# Are you tired of trying to remember what .bashrc does vs .bash_profile vs .profile?

wolever

"""
Template tags for creating links to media files, which are suffixed with the media file's
mtime (foo.jpg?123456) for the purposes of cache busting.

Use:
- Put this file in a `<django-app>/templatetags/` directory
- To link to media files from a template, use:

    {% load media_link %}
    {% stylesheet_link "css/base.css" %}

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

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

wolever

Below are some issues we encountered during our first real deployment of gevent. It is being used on one host to communicate over ethernet (ie, using raw ethernet packets) with approximately 700 PIC32 microprocessors, and it is used for communication between all of the services we have built (approximately 15 unique services running on two hosts).

• The majority of the issues we faced were caused by a particular service which communicates with a child process over stdin/stdout. Not all of the issues were gevent specific (for example, when the child wasn't properly selecting on stdout, the kernel was silently dropping data when its internal buffer filled up, even though fwrite reported that the data had been written).
• We are using gevent-0.13.7 with libevent-2.0.x. I would like to be using gevent-1.0, but it was causing some issues (I don't recall exactly what they were) on OS X, so we rolled back to 0.13.7.
• libevent-1.4.13-stable (packages with Debian stable 6.0.4) would, under moderate l

victorbstan

autocmd VimEnter * NERDTree
autocmd VimEnter * wincmd p
autocmd FileType javascript set omnifunc=javascriptcomplete#CompleteJS

"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
" => General
"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
" Sets how many lines of history VIM has to remember
set history=700

guyromm

@app.route('/socket.io/websocket')
def socketio():
    s = request.environ['socketio']
    if s.on_connect():
        #print 'CONNECTED', locals()
        #s.send({'buffer': buffer})
        #s.broadcast({'announcement': s.session.session_id + ' connected'})
        pass
    game_id=None;game=None;cook=None;i_am='spectator';rdsub = redis.Redis('localhost')
    while True: