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See the current amount of free and used memory in the system:

free -m

What actual time we have (in the console):

time = Benchmark.measure do
  app.get '/needed-page'
end

puts time

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# Test script to profile requests with GC options in case you have only access into the console.
#
# Invoke the script in the staging/production console:
#
#   RAILS_ENV=production rails console
#   [1] pry(main)> load '/path/to/the-file/requests.rb'
#
# You will see benchmark results per link for analyzing.
#
# You should run it before and after changing GC options for comparison.

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# Returns a number rounded to the desired multiple 0.5,
# analog of excel's MROUND(A1, 0.05).
def mround(number)
  (number * 20).round.to_f / 20
end

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Project

Some description how is awesome the project.

How to hit the ground running

• Follow installation instructions in doc/INSTALLATION
• Follow deployment instructions in doc/DEPLOYMENT
• Follow workflow process in doc/WORKFLOW

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current_date=`date +%Y-%m-%d-%H:%M`
file_name="db.$current_date.sql.gz"
file_path="/mnt/backup/$file_name"
mysqldump --single-transaction --quick -u*** -p*** DB | gzip -c > $file_name
echo `ls -la $file_path` | mail -s "[backup] DB" admin@site.com

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def fast_log_in
  user = Factory.create(:user)
  warden_key = User.serialize_into_session(user).unshift('User')
  page.set_rack_session(:'warden.user.user.key' => warden_key)

  user
end

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# Create the archive
tar -zcvf archive.tar.gz /home/dir

# Restore the archive
tar -zxvf archive.tar.gz
tar -zxvf archive.tar.gz -C /tmp

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# http://www.fsarchiver.org/QuickStart
sudo apt-get install fsarchiver

# Find out what partition is used for the current folder and choose another partition for the dump
df -h .
df -h

# Re-mount /dev/md2 partition to read only mode
sudo mount -o remount,ro /dev/md2
sudo fsarchiver savefs ./ubuntu-md2.fsa /dev/md2

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// Enhanced and fixed the dequeue method
if (first == null) return null;
Object item = first.data;
first = first.next;
if (first == null) last = null;
return item;

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require 'minitest/autorun'

class Towers
  class CantPlaceError < StandardError; end

  attr_accessor :from, :to

  def initialize(from, to)
    @from   = from
    @to     = to