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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def run():
 """Use preconfigured settings to optimize files."""

    # Setup Multiprocessing
    # manager = multiprocessing.Manager()
    Settings.pool = multiprocessing.Pool(Settings.jobs)

    # Optimize Files
    record_dirs, bytes_in, bytes_out, nag_about_gifs, errors = \
        _walk_all_files()

    # Shut down multiprocessing
    Settings.pool.close()
    Settings.pool.join()

    # Write timestamps
    for filename in record_dirs:
        timestamp.record_timestamp(filename)

    # Finish by reporting totals
    stats.report_totals(bytes_in, bytes_out, nag_about_gifs, errors)