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

benhedrington

#!/bin/sh
# dropbox service
# Replace with linux users you want to run Dropbox clients for
DROPBOX_USERS="user1 user2"
 
DAEMON=.dropbox-dist/dropbox
 
start() {
    echo "Starting dropbox..."
    for dbuser in $DROPBOX_USERS; do

indapa

#I'm taking the STanford on line course Probabilistic Graphical Models <pgm-class.org>
# They have a simple  example of a Bayesian network for a Student letter of reference
# the code below was originally posted by a fellow classmate taking the class
# it really helped me in understanding how to do computations on conditional probability tables (CPDs) that 
# form the heart of Bayesian networks

from numpy import *
P_I = array([
[0.7,0.3]
])

Dither

// JavaScript function for converting simple XPath to CSS selector.
// Ported by Dither from [cssify](https://github.com/santiycr/cssify)
// Example: `cssify('//div[@id="girl"][2]/span[@class="body"]//a[contains(@class, "sexy")]//img[1]')`

var sub_regexes = {
    "tag": "([a-zA-Z][a-zA-Z0-9]{0,10}|\\*)",
    "attribute": "[.a-zA-Z_:][-\\w:.]*(\\(\\))?)",
    "value": "\\s*[\\w/:][-/\\w\\s,:;.]*"
};

esperlu

#!/bin/sh

# Converts a mysqldump file into a Sqlite 3 compatible file. It also extracts the MySQL `KEY xxxxx` from the
# CREATE block and create them in separate commands _after_ all the INSERTs.

# Awk is choosen because it's fast and portable. You can use gawk, original awk or even the lightning fast mawk.
# The mysqldump file is traversed only once.

# Usage: $ ./mysql2sqlite mysqldump-opts db-name | sqlite3 database.sqlite
# Example: $ ./mysql2sqlite --no-data -u root -pMySecretPassWord myDbase | sqlite3 database.sqlite