ok, here's a simple code.
It's fast when a single client but when clients increases, the query time will increase significantly even up to 100 times (see the output in console).
I can't figure out where the problem is.

import asyncio
import asyncio_redis
from aiohttp import web

connection_args = {
    'host': '127.0.0.1',
    'port': 6379,
    'poolsize': 100,
    'auto_reconnect': True
}

client = asyncio.get_event_loop().run_until_complete(
        asyncio_redis.Pool.create(**connection_args))


async def hello(request):
    import time
    _ = time.time()
    result = await client.mget(["10003:1000031463",
                "10003:1000031055",
                "10003:1000031467",
                "10003:1000031077",
                "10003:1000031868",
                "10003:1000031464",
                "10003:1000031076",
                "10003:1000031934",
                "10003:1000031834",
                "10003:1000031469",
                "10003:1000031068",
                "10003:1000031462",
                "10003:1000031466",
                "10003:1000031899",
                "10003:1000031858",
                "10003:1000031900",
                "10003:1000031056",
                "10003:1000031078",
                "10003:1000031340",
                "10003:1000031331"])
    result_real = await result.aslist()
    print(time.time() - _)
    return web.Response(text=str(result_real))


# test data
keys = ["10003:1000031463",
                "10003:1000031055",
                "10003:1000031467",
                "10003:1000031077",
                "10003:1000031868",
                "10003:1000031464",
                "10003:1000031076",
                "10003:1000031934",
                "10003:1000031834",
                "10003:1000031469",
                "10003:1000031068",
                "10003:1000031462",
                "10003:1000031466",
                "10003:1000031899",
                "10003:1000031858",
                "10003:1000031900",
                "10003:1000031056",
                "10003:1000031078",
                "10003:1000031340",
                "10003:1000031331"]

values = ['1'] * len(keys)
redis_values = zip(keys, values)
loop = asyncio.get_event_loop()

for k, v in redis_values:
    loop.run_until_complete(client.set(k, v))

app = web.Application()
app.router.add_route('GET', '/', hello)

handler = app.make_handler()
f = loop.create_server(handler, '0.0.0.0', 8080)
srv = loop.run_until_complete(f)

try:
    loop.run_forever()
except KeyboardInterrupt:
    pass
finally:
    srv.close()
    loop.run_until_complete(srv.wait_closed())
    loop.run_until_complete(handler.finish_connections(1.0))
    loop.run_until_complete(app.finish())

Uh oh!

Does linux kernel version affect the performance of asyncio ? #311

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