JonCole

Debugging Redis Keyspace Misses

Simply put, a keyspace "MISS" means some piece of data you tried to retrieve from Redis was not there. This usually means that one of the following things happened:

1. The key expired
2. They key was renamed
3. The key was deleted
4. The key was evicted due to memory pressure
5. The entire database was flushed
6. The key was never actually inserted

rponte

# The command finds the most recent tag that is reachable from a commit.
# If the tag points to the commit, then only the tag is shown.
# Otherwise, it suffixes the tag name with the number of additional commits on top of the tagged object 
# and the abbreviated object name of the most recent commit.
git describe

# With --abbrev set to 0, the command can be used to find the closest tagname without any suffix:
git describe --abbrev=0

# other examples

laracasts

var gulp = require('gulp');
var phpspec = require('gulp-phpspec');
var run = require('gulp-run');
var notify = require('gulp-notify');

gulp.task('test', function() {
   gulp.src('spec/**/*.php')
       .pipe(run('clear'))
       .pipe(phpspec('', { notify: true }))
       .on('error', notify.onError({

kingbin

# Stop PostgreSQL from auto starting
sudo launchctl unload -w /Library/LaunchDaemons/com.edb.launchd.postgresql-9.3.plist
 
# Enable PostgreSQL to auto start
sudo launchctl load -w /Library/LaunchDaemons/com.edb.launchd.postgresql-9.3.plist

# Start postgres
 $ sudo su postgres
Password:
bash-3.2$ pg_ctl -D /Library/PostgreSQL/9.3/data/ start

tott

/**
 * Check if a given ip is in a network
 * @param  string $ip    IP to check in IPV4 format eg. 127.0.0.1
 * @param  string $range IP/CIDR netmask eg. 127.0.0.0/24, also 127.0.0.1 is accepted and /32 assumed
 * @return boolean true if the ip is in this range / false if not.
 */
function ip_in_range( $ip, $range ) {
	if ( strpos( $range, '/' ) == false ) {
		$range .= '/32';
	}

jbenet

a simple git branching model (written in 2013)

This is a very simple git workflow. It (and variants) is in use by many people. I settled on it after using it very effectively at Athena. GitHub does something similar; Zach Holman mentioned it in this talk.

Update: Woah, thanks for all the attention. Didn't expect this simple rant to get popular.

jhjguxin

Low memory consumption with MongoDB

resouces

• http://stackoverflow.com/questions/15359271/low-memory-consumption-with-mongodb
• http://www.kchodorow.com/blog/2012/05/10/thursday-5-diagnosing-high-readahead/
• http://serverfault.com/questions/408100/mongodb-and-datasets-that-dont-fit-in-ram-no-matter-how-hard-you-shove
• http://markmail.org/message/utuxcatjdgxwe72z
• http://docs.mongodb.org/manual/administration/production-notes/#readahead
• http://linux.die.net/man/8/blockdev

ngocphamm

Backend Architectures

Twitter

ror, scala, jetty, erlang, thrift, mongrel, comet server, my-sql, memchached, varnish, kestrel(mq), starling, gizzard, cassandra, hadoop, vertica, munin, nagios, awstats

• Scaling Twitter: Making Twitter 10000 Percent Faster
• Scaling Twitter
• Blaine Cook on Scaling Twitter - YouTube

wacko

On Mac OS (host):

Shutdown your VM and do:

VirtualBox > Settings > Network > Add (you will get vboxnet0)

On a terminal ifconfig will show you new interface vboxnet0

VM's Settings > System > check "Enable I/O APIC." VM's Settings > Network > Adapter 2 > host-only vboxnet0