- 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
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 |
-- 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%' |
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.
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'] }} |
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.
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.