Ruby task uses 97 %CPU - ruby-on-rails

Question

My ruby application uses about 97 %CPU which eventually gets killed. The program is reading files from the folder and if a file name exists in the database, it skips it and checks another file. While executing this procedure, application usually gets killed.
COMMAND %CPU
ruby 96.5
Even if I insert almost all files and try to lunch an application again (because it was killed), system tends to kill it even sooner. How can I decrease the %CPU?
task :process_data, [:data_directory] => :environment do |_task, args|
# add data to a database
saver = CsvToSqlSaver.new
saver.fill_files_names
Dir.foreach(args.data_directory) do |filename|
# if not present in records already we read it
Base.logger.info "> Found #{filename}."
next if saver.files_names.to_s.include?(filename) ||
!filename.include?('csv')
Base.logger.info "> Reading #{filename}."
begin
saver.generate_db_rows_from_csv_file(args.data_directory, filename)
# handle Malformed .csv exception
rescue CSV::ArgumentError, CSV::MalformedCSVError => e
Base.logger.info e.message
next
end # we continue csv file loop?
unless integrator.insert_data_to_database
Base.logger.info '> No new data saved.'
end
end
end
This is fill_files_names:
def fill_files_names
#files_names = []
files_names = MyFilesTable.select(:filename).distinct
files_names.each do |row|
#files_names.push(row[:filename])
end
end
This is Base:
class Base
class << self
attr_accessor :logger
end
#logger ||= Logger.new(STDERR)
end
This is generate_db_rows_from_csv_file
def generate_db_rows_from_csv_file(directory, filename)
#incoming_data = []
CSV.foreach("#{directory}/#{filename}",
headers: true, quote_char: "\x00") do |csv_record|
# if invalid record, go further
next if record_invalid?(csv_record)
generate_row_in_the_database(csv_record, filename)
end
end