Send Simultaneous Requests python (all at once)

问题:

I'm trying to create a script that send's over 1000 requests to one page at the same time. But requests library with threading (1000) threads. Seems to be doing to first 50 or so requests all within 1 second, whereas the other 9950 are taking considerably longer. I measured it like this.

def print_to_cmd(strinng):
    queueLock.acquire()
    print strinng
    queueLock.release()

    start = time.time()
    resp = requests.get('http://test.net/', headers=header)
    end = time.time()

    print_to_cmd(str(end-start))

I'm thinking requests library is limiting how fast they are getting sent.

Doe's anybody know a way in python to send requests all at the same time? I have a VPS with 200mb upload so that is not the issue its something to do with python or requests library limiting it. They all need to hit the website within 1 second of each other.

Thanks for reading and I hope somebody can help.

回答1:

I have generally found that the best solution is to use an asynchronous library like tornado. The easiest solution that I found however is to use ThreadPoolExecutor.

---

import requests
from concurrent.futures import ThreadPoolExecutor

def get_url(url):
    return requests.get(url)
with ThreadPoolExecutor(max_workers=50) as pool:
    print(list(pool.map(get_url,list_of_urls)))

回答2:

Assumed that you know what you are doing, I first suggest you to implement a backoff policy with a jitter to prevent "predictable thundering hoardes" to your server. That said, you should consider to do some threading

import threading
class FuncThread(threading.Thread):
    def __init__(self, target, *args):
        self._target = target
        self._args = args
        threading.Thread.__init__(self)

    def run(self):
        self._target(*self._args)

so that you would do something like

t = FuncThread(doApiCall, url)
t.start()

where your method doApiCall is defined like this

def doApiCall(self, url):