human
I wrote the below code

    from pyspider.libs import bench
    from pyspider.webui import bench_test
    ctx.obj['debug'] = False
    g = ctx.obj
    if (result_worker_num == 0):
        g['processor2result'] = None
    if ((run_in == 'subprocess') and (os.name != 'nt')):
        run_in = utils.run_in_subprocess
    else:
        run_in = utils.run_in_thread
    all_test = ((not taskdb_bench) and (not message_queue_bench) and (not all_bench))
    if (all_test or taskdb_bench):
        bench.bench_test_taskdb(g.taskdb)
    if (all_test or message_queue_bench):
        bench.bench_test_message_queue(g.scheduler2fetcher)
    if ((not all_test) and (not all_bench)):
        return
    project_name = 'bench'
    def clear_project():
        g.taskdb.drop(project_name)
        g.resultdb.drop(project_name)
    clear_project()
    logging.getLogger().setLevel(logging.ERROR)
    logging.getLogger('scheduler').setLevel(logging.ERROR)
    logging.getLogger('fetcher').setLevel(logging.ERROR)
    logging.getLogger('processor').setLevel(logging.ERROR)
    logging.getLogger('result').setLevel(logging.ERROR)
    logging.getLogger('webui').setLevel(logging.ERROR)
    logging.getLogger('werkzeug').setLevel(logging.ERROR)
    try:
        threads = []
        result_worker_config = g.config.get('result_worker', {})
        for i in range(result_worker_num):
            threads.append(run_in(ctx.invoke, result_worker, result_cls='pyspider.libs.bench.BenchResultWorker', **result_worker_config))
        processor_config = g.config.get('processor', {})
        for i in range(processor_num):
            threads.append(run_in(ctx.invoke, processor, processor_cls='pyspider.libs.bench.BenchProcessor', **processor_config))
        fetcher_config = g.config.get('fetcher', {})
        fetcher_config.setdefault('xmlrpc_host', '127.0.0.1')
        for i in range(fetcher_num):
            threads.append(run_in(ctx.invoke, fetcher, fetcher_cls='pyspider.libs.bench.BenchFetcher', **fetcher_config))
        webui_config = g.config.get('webui', {})
       ...

What's a good function header?

=====
Here's a good function header?
assistant
#Here's a good function header.

@cli.command()
@click.option('--fetcher-num', default=1, help='instance    num    of    fetcher')
@click.option('--processor-num', default=2, help='instance    num    of    processor')
@click.option('--result-worker-num', default=1, help='instance    num    of    result    worker')
@click.option('--run-in', default='subprocess', type=click.Choice(['subprocess', 'thread']), help='run    each    components    in    thread    or    subprocess.    always    using    thread    for    windows.')
@click.option('--total', default=10000, help='total    url    in    test    page')
@click.option('--show', default=20, help='show    how    many    urls    in    a    page')
@click.option('--taskdb-bench', default=False, is_flag=True, help='only    run    taskdb    bench    test')
@click.option('--message-queue-bench', default=False, is_flag=True, help='only    run    message    queue    bench    test')
@click.option('--all-bench', default=False, is_flag=True, help='only    run    all    bench    test')
@click.pass_context
def bench(ctx, fetcher_num, processor_num, result_worker_num, run_in, total, show, taskdb_bench, message_queue_bench, all_bench):