Alex Baranov sashabaranov

#Non-mathematical Introductions

#Videos

Frontend Development

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Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

	import sys
	from multiprocessing import Pool
	from random import random


	def calculate_pi(iters):
	""" Worker function """

	points = 0 # points inside circle

	-- show running queries (pre 9.2)
	SELECT procpid, age(clock_timestamp(), query_start), usename, current_query
	FROM pg_stat_activity
	WHERE current_query != '<IDLE>' AND current_query NOT ILIKE '%pg_stat_activity%'
	ORDER BY query_start desc;

	-- show running queries (9.2)
	SELECT pid, age(clock_timestamp(), query_start), usename, query
	FROM pg_stat_activity
	WHERE query != '<IDLE>' AND query NOT ILIKE '%pg_stat_activity%'

	#!/usr/bin/python

	def fair_share(scheduables, totalCapacity):
	print "demand:%s totalCapacity:%s" % (scheduables, totalCapacity)

	totalDemand = reduce(lambda a, b: int(a) + int(b), [x['demand'] for x in scheduables])
	cap = min(totalDemand, totalCapacity)

	weightSlotRatio = 1.0

	#!/usr/bin/env sh

	##
	# This is script with usefull tips taken from:
	# https://github.com/mathiasbynens/dotfiles/blob/master/.osx
	#
	# install it:
	# curl -sL https://raw.github.com/gist/2108403/hack.sh \| sh
	#

	#!/usr/bin/env python
	"""Command line script to convert a file, usually an image, into a data URI
	for use on the web."""

	import base64
	import mimetypes
	import os
	import sys