rsarai

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

rsarai

-- psql
-- \timing on

-- Creating test data
CREATE TABLE largetable (id INT NOT NULL, content TEXT);

INSERT INTO largetable
    SELECT i, 'The Road Not Taken'
              'Two roads diverged in a yellow wood,'
              'And sorry I could not travel both'

rsarai

# Yield results asynchronously in python
# https://stackoverflow.com/questions/23351332/yield-results-asynchronously-in-python-using-multiprocessing-or-twisted
# https://medium.com/@apbetahouse45/asynchronous-web-scraping-in-python-using-concurrent-module-a5ca1b7f82e4
# https://stackoverflow.com/questions/22445054/asyncio-yield-from-concurrent-futures-future-of-an-executor
# https://docs.python.org/3/library/concurrent.futures.html#concurrent.futures.Executor.submit

import time 
import multiprocessing 
from concurrent.futures import ProcessPoolExecutor 
 

rsarai

// ==UserScript==
// @name         Airflow auto-reload
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  try to take over the world!
// @author       Rebeca
// @match        http://localhost:3000/*
// @grant        none
// ==/UserScript==

rsarai

import time
import random

sorted_array = []
unsorted_array = []

for i in range(0, 1000000):
    random_integer = random.randint(0, 1000000)
    unsorted_array.append(random_integer)

rsarai

# Celery
CELERY_SEND_TASK_ERROR_EMAILS = True
CELERYD_HIJACK_ROOT_LOGGER = False

LOGGING = {
    'version': 1,
    'disable_existing_loggers': False,
    'root': {
        'level': 'INFO',
        'handlers': ['console', 'sentry'],

rsarai

Ryu Firewall

Topology

Commands

• On an usual terminal

$ sudo mn --topo single,3 --mac --switch ovsk --controller remote -x
*** Creating network

rsarai

// To present on class, run the following commands
sudo killall controller
sudo mn -c

// terminal
sudo mn -x --topo single,3 --mac --controller remote --switch ovsk

// switch root s1
sudo ovs-vsctl set bridge s1 protocols=OpenFlow13

rsarai

Endpoints

Ghost Links:

• https://api.ghost.org/docs/tags
• https://docs.ghost.org/api/content/#endpoints

Blog Home

• Get All Posts https://demo.ghost.io/ghost/api/v2/content/posts/?key=22444f78447824223cefc48062

rsarai

import falcon
from .movies import Movie


api = application = falcon.API()

movie = Movie()
api.add_route('/movies', movie)