Tags » Gevent

Polling is a Hack: Server Sent Events (EventSource) with gevent, Flask, nginx, and FreeBSD

Server-sent events efficiently sends data to clients in real-time and asynchronously. This particular setup was used for STATICFUZZ and shows you how to send an event from server/Python to client/JavaScript, plus setting up the server! 794 more words


How we use gevent to go fast

“Not too long ago we were tackling the challenge of fixing a legacy Python system and converting a two-year old single-threaded codebase with hundreds of thousands of lines of code to a multi-threaded codebase. 55 more words



import gevent.monkey
import gevent
import urllib2
import simplejson as json

from gevent import queue
from gevent import pool
def fetch(pid):
    response = urllib2.urlopen('http://json-time.appspot.com/time.json')
    result = response.read()
    json_result = json.loads(result)
    datetime = json_result['datetime']
    print 'Process ', pid, datetime
    return json_result['datetime']

# worker_sequence = []
def asynchronous(worker_sequence):
    for i in range(1,10):
        g = gevent.spawn(fetch, i)
    print len(worker_sequence)

# worker_sequence = gevent.queue.Queue()
# or, worker_sequence = gevent.queue.JoinableQueue()
# error: "this operation would block forever" after all works are done 
def asynchronous(worker_sequence):
    for i in range(1,10):
        g = gevent.spawn(fetch, i)

# worker_poll = gevent.pool.Pool()
def asynchronous(worker_pool):
    for i in range(1,10):
        g = gevent.spawn(fetch, i)
    print len(worker_pool)
    print len(worker_pool)

threads = []
#threads = queue.JoinableQueue()
#threads = queue.Queue()
#threads = pool.Pool(100)

print 'Asynchronous:'
… 35 more words

Tornado vs. Gevent - Benchmarks

“After FriendFeed was acquired several years ago, Tornado stagnated a bit, but this past year the community has been hard at work. Version 2.0 came out this past June, and the framework is now at 2.4.1 (at the time of this writing). 60 more words


GreenletProfiler, A Fast Python Profiler For Gevent

“If you use Gevent, you know it’s great for concurrency, but alas, none of the Python performance profilers work on Gevent applications. So I’m taking matters into my own hands. 27 more words


Introduction to Gevent

“In a previous post, I described how to build a web chat server with socket.io and gevent. If you’re trying to actually learn gevent, socket.io, however, it’s probably not the best place to start. 56 more words