Optimizing your project

Also see deployment optimization tips.

RSync ignores

Set "rsync_ignores" in config/testbot.yml (or by --rsync_ignores).

To make rsync fast:

• All developer rsync copies should be about the same size.
• The rsynced directory should be as small as possible.

Use Ruby EE

It's faster than the official ruby release. Also, you can experiment with GC settings.

Caching the database setup so that it only runs when schema.rb changes

In testbot.rake:

class CacheTool
  
  def initialize(part)
    @part = part
  end
    
  def cache
    system "mkdir -p #{cache_dir}"
    cache_key = yield(:generate_cache_key, cache_dir).chomp
    if File.exists?(cache_file)
      old_key = File.read(cache_file).chomp
      if old_key != cache_key
        yield(:build, cache_dir)
      else
        yield(:restore, cache_dir)
      end
    else
      yield(:build, cache_dir)
    end
    
    File.open(cache_file, 'w') do |file|
      file.write(cache_key)
    end
  end
  
  def self.clear_all_caches!
    system "rm -rf /tmp/.testbot_cache_*"
  end  
  
  private
  
  def cache_dir
    cache_file + "_data"
  end
  
  def cache_file
    @cache_file ||= "/tmp/.testbot_cache_#{Dir.pwd.split('/').last}_#{@part}"
  end
  
end

# This is run on the developer box
task :before_request do
  # system "git log -1 vendor/gems|grep commit > .testbot_gem_cache_key"
  system "git log -1 db/schema.rb|grep commit > .testbot_db_cache_key"
end

# This is run on the runner/worker box
task :before_run do
  #CacheTool.clear_all_caches!
  
  CacheTool.new('databases').cache do |type, cache_dir|
    if type == :generate_cache_key
      File.read('.testbot_db_cache_key')
    elsif type == :build
      # Recreate your database here
    elsif type == :restore
      # Typically not used for DB cache. We use it to restore built gems.
    end
  end
end