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On vacation

Oshan Wisumperuma oshanz

On vacation
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View Using GDB to inspect a running Ruby

That’s not a great thing to have to say, is it? However, I bet you’ve said it before and may not have immediately know why.

With liberal use of puts and maybe pry, you can figure out what a problem might be next time you run it, but sometimes you need to figure out what that problem is right now.

As it turns out, and I know this is a shocker, Ruby processes are just regular processes. They can be debugged with gdb.

Having recently had the need to find out why a job of mine was running particularly slowly, I found out about this lovely tool the hard way: frantic googling. I found some very useful functions for gdb in a blog post by Rasmus on Ruby callstacks.

oshanz / database.yml
Created Mar 2, 2020 — forked from henrik/database.yml
Per-branch development database with Git and Ruby on Rails.
View database.yml
DEFAULT_DB = 'myapp_development'
DB_BRANCHES = %w[ t79 ]
branch = `git symbolic-ref HEAD 2> /dev/null`.chomp.split('/').last
dev_db = DB_BRANCHES.include?(branch) ? branch.gsub(/[^a-zA-Z0-9_]/, '') : DEFAULT_DB
puts "Using dev database: #{dev_db.inspect}"
database: <%= dev_db %>
oshanz / High performance tuning of Nginx
Created Jan 13, 2020 — forked from perusio/gist:2154235
High performance tuning of Nginx
View High performance tuning of Nginx
## From a post on the ML, apropos this:
## For sysctl.conf
net.ipv4.tcp_slow_start_after_idle = 0
echo "2048 64512" > /proc/sys/net/ipv4/ip_local_port_range
echo "1" > /proc/sys/net/ipv4/tcp_tw_recycle
echo "1" > /proc/sys/net/ipv4/tcp_tw_reuse
oshanz / delayed_job@.service
Created Jan 6, 2020 — forked from stevensona/delayed_job@.service
systemd unit file for running ruby/rails delayed_job as service
View delayed_job@.service
# Keep delayed job workers running using systemd on ubuntu
# Usage
# Start "sudo systemctl start delayed_job@{0..3}" to start 4 worker instances
# Enable "sudo systemctl enable delayed_job@{0..3}" to enable 4 worker instances
# Restart "sudo systemctl restart delayed_job@{0..3}" to restart 4 worker instances
# Disable "sudo systemctl disable delayed_job@{0..3}" to disable 4 worker instances
# Stop "sudo systemctl stop delayed_job@{0..3}" to stop 4 worker instances
Description=Delayed Job Worker %i
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oshanz / Serializor.php
Created Oct 16, 2015 — forked from bubba-h57/Serializor.php
Doctrine 2 Entities Serialized to JSON
View Serializor.php
namespace H57\Util;
class Serializor {
* Converts the Doctrine Entity into a JSON Representation
* @param object $object The Object (Typically a Doctrine Entity) to convert to an array
oshanz / date.sql
Last active Aug 29, 2015 — forked from johngrimes/date.sql
MySQL Date Dimension Build Script
View date.sql
/* Adapted from Tom Cunningham's 'Data Warehousing with MySql' ( */
###### small-numbers table
DROP TABLE IF EXISTS numbers_small;
CREATE TABLE numbers_small (number INT);
INSERT INTO numbers_small VALUES (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
###### main numbers table
CREATE TABLE numbers (number BIGINT);
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