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@kracekumar
kracekumar / ws_app.py
Last active October 5, 2021 08:52
Simple websocket server with uvloop.
# -*- coding: utf-8 -*-
import asyncio
import uvloop
from aiohttp.web import Application, MsgType, WebSocketResponse
def add_socket(app, socket, user_id):
if user_id in app['connections']:
pass
@jboner
jboner / latency.txt
Last active April 25, 2024 11:20
Latency Numbers Every Programmer Should Know
Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference 0.5 ns
Branch mispredict 5 ns
L2 cache reference 7 ns 14x L1 cache
Mutex lock/unlock 25 ns
Main memory reference 100 ns 20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy 3,000 ns 3 us
Send 1K bytes over 1 Gbps network 10,000 ns 10 us
Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD