tsiege

ANNOUNCEMENT

I have moved this over to the Tech Interview Cheat Sheet Repo and has been expanded and even has code challenges you can run and practice against!






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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

CliffordAnderson

Analyzing the U-Bahn Network with Neo4J

The goal of this exercise is to extract information about the Berlin metro system from Wikidata and to analyze its relationships with Neo4j.

max-mapper

var crypto = require('crypto')
var request = require('request')
var url = require('url')
var irc = require('./IRC/lib/irc') // https://github.com/gf3/IRC-js
var ntwitter = require('ntwitter')
var twitter = require('twitter')
var qs = require('querystring')

// separate accounts to post and search because twitter was sending me 500s
// when I tried to use the same oauth creds for both twitter() and ntwitter()

mrflip

Next Steps

• Measure time spend on index, flush, refresh, merge, query, etc. (TD - done)
• Take hot threads snapshots under read+write, read-only, write-only (TD - done)
• Adjust refresh time to 10s (from 1s) and see how load changes (TD)
• Measure time of a rolling restart doing disable_flush and disable_recovery (TD)
• Specify routing on query -- make it choose same node for each shard each time (MD)
• GC new generation size (TD)
• Warmers

• measure before/after of client query time with and without warmers (MD)

fightingtheboss

packages:
  yum:
    git: []

files:
  /opt/elasticbeanstalk/hooks/appdeploy/pre/51install_meteor.sh:
    mode: "000755"
    user: root
    group: root
    encoding: plain

coderanger

How to patch Ubuntu for Heartbleed

1. sudo apt-get update
2. sudo apt-get install -y libssl1.0.0 openssl
3. openssl version -a and confirm the "built on" date is >= 2014-04-07
4. sudo lsof -n | grep ssl | grep DEL and restart all listed services.

Repeat #4 until no results are returned.

koenpunt

select.form-control + .chosen-container.chosen-container-single .chosen-single {
    display: block;
    width: 100%;
    height: 34px;
    padding: 6px 12px;
    font-size: 14px;
    line-height: 1.428571429;
    color: #555;
    vertical-align: middle;
    background-color: #fff;

max-mapper

Interdisciplinary Open Source Community Conferences

Criteria

• Must be an event that someone involved in open source would be interested in attending
• Must be a community oriented event (no corporate owned for-profit events here please)
• Can't be about a specific language/framework.

Leave suggestions in the comments below

dbainbridge

/**
 * Module dependencies.
 */

var express = require('express')
  , routes = require('./routes')
  , http = require('http');

var app = express();
var server = app.listen(3000);