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Scheduling latencies with gevent/greenlet
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Total time: 1.027ms | |
Latencies: 0.228ms-0.390ms | |
First-last send: 0.308ms | |
First-last recv: 0.050ms | |
First-last return: 0.146ms |
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import time | |
import gevent | |
from gevent.queue import Queue | |
from gevent.event import AsyncResult | |
class Context(object): | |
def __init__(self): | |
self.requests = Queue() | |
self.latencies = [] | |
self.first_send = None | |
self.first_recv = None | |
self.first_ret = None | |
self.last_send = None | |
self.last_recv = None | |
self.last_ret = None | |
def queue_worker(ctx): | |
while True: | |
r, value = ctx.requests.get() | |
t = time.time() | |
if ctx.first_recv is None: | |
ctx.first_recv = t | |
ctx.last_recv = t | |
r.set(value) | |
def send_get_reply(ctx, value): | |
t = time.time() | |
if ctx.first_send is None: | |
ctx.first_send = t | |
ctx.last_send = t | |
r = AsyncResult() | |
ctx.requests.put((r, value)) | |
result = r.get() | |
t1 = time.time() | |
ctx.latencies.append(t1 - t) | |
if ctx.first_ret is None: | |
ctx.first_ret = t1 | |
ctx.last_ret = t1 | |
return result | |
def requester(ctx, index): | |
send_get_reply(ctx, index) | |
def main(): | |
ctx = Context() | |
gevent.spawn(queue_worker, ctx) | |
t0 = time.time() | |
gg = [gevent.spawn(requester, ctx, index) for index in xrange(30)] | |
gevent.wait(gg) | |
for g in gg: | |
g.get() | |
t1 = time.time() | |
ctx.latencies.sort() | |
print 'Total time: %.3fms' % ((t1 - t0) * 1000,) | |
print 'Latencies: %.3fms-%.3fms' % (ctx.latencies[0] * 1000, ctx.latencies[-1] * 1000) | |
print 'First-last send: %.3fms' % ((ctx.last_send - ctx.first_send) * 1000,) | |
print 'First-last recv: %.3fms' % ((ctx.last_recv - ctx.first_recv) * 1000,) | |
print 'First-last return: %.3fms' % ((ctx.last_ret - ctx.first_ret) * 1000,) | |
if __name__ == '__main__': | |
main() |
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