posener

Story: Writing Scripts with Go

This is a story about how I tried to use Go for scripting. In this story, I’ll discuss the need for a Go script, how we would expect it to behave and the possible implementations; During the discussion I’ll deep dive to scripts, shells, and shebangs. Finally, we’ll discuss solutions that will make Go scripts work.

Why Go is good for scripting?

While python and bash are popular scripting languages, C, C++ and Java are not used for scripts at all, and some languages are somewhere in between.

ryan-lane

base:
  # For each directory that can have pillar files
  {% for root in opts['pillar_roots']['base'] -%}
  # Set a variable to the path to check
  {% set mygrain_sls = '{0}/{1}.sls'.format(root, grains['mygrain']) -%}
  # Check to see if the file exists, if so, include that pillar file.
  {% if salt['file.file_exists'](mygrain_sls) %}
  'service_group:{{ grains["mygrain"] }}':
    - match: grain
    - {{ grains['mygrain'] }}

jfryman

Glad you're here!

PuppetConf 2013 Presentation (fryman)

but!

let's keep this our secret. If the talk hasn't started yet, please don't tell those around you about this page. sure, hint and all... but it's more fun if they find it themselves. Also, don't tweet about this until I ask you to (and yes, I'll ask you to. Pretty please? can you? oh, you're the best. I knew you would.).

I do promise I'll tell everyone eventually, but for now you can feel good you found this page before your friend Bob.

dypsilon

Backend Development

• node.js
  • Installation paths: use one of these techniques to install node and npm without having to sudo.
  • Node.js HOWTO: Install Node+NPM as user (not root) under Unix OSes
  • Felix's Node.js Guide
  • Creating a REST API using Node.js, Express, and MongoDB
  • Node Cellar Sample Application with Backbone.js, Twitter Bootstrap, Node.js, Express, and MongoDB
  • JavaScript Event Loop
• Node.js for PHP programmers

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%' 

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