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@sirleech
sirleech / gist:2660189
Created May 11, 2012 14:42
Python Read JSON from HTTP Request of URL
# Load Json into a Python object
import urllib2
import json
req = urllib2.Request("http://localhost:81/sensors/temperature.json")
opener = urllib2.build_opener()
f = opener.open(req)
json = json.loads(f.read())
print json
print json['unit']
@jboner
jboner / latency.txt
Last active July 22, 2024 14:44
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
@bokmann
bokmann / JRuby Awesome Performance
Last active August 31, 2023 07:32
brief summary of massive performance improvements with JRuby
# Thee will be more information here when I share the entire problem space I'm working on, but
# in short, this is preview material for my second talk in a series called "What Computer Scientists Know".
# The first talk is on recursion, and goes through several examples., leading up to a problem based
# on a simple puzzle that initial estimates based on performance of a previous puzzle would take years
# to solve on modern computers with the techniques shown in Ruby. That sets the stage for improving the
# performance of that problem with threading, concurrency, and related tuning.
#
# The second talk is on threading and concurrency, touching on algorithmic performance as well.
# Using some knowledge of the problem (board symmetry, illegal moves, etc), we reduce the problem space
# to about .5% of what we initially thought it was. Still, the initial single threaded solution took more
@takekazuomi
takekazuomi / csharp.gitignore
Created April 17, 2014 05:47
.gitignore for C#
## Ignore Visual Studio temporary files, build results, and
## files generated by popular Visual Studio add-ons.
# User-specific files
*.suo
*.user
*.sln.docstates
# Build results
@RichardBronosky
RichardBronosky / pep8_cheatsheet.py
Created December 27, 2015 06:25
PEP-8 cheatsheet
#! /usr/bin/env python
# -*- coding: utf-8 -*-
"""This module's docstring summary line.
This is a multi-line docstring. Paragraphs are separated with blank lines.
Lines conform to 79-column limit.
Module and packages names should be short, lower_case_with_underscores.
Notice that this in not PEP8-cheatsheet.py
@hedinasr
hedinasr / flood_udp.py
Created January 10, 2017 10:24
Python UDP Flooder
"""
UDP Flooder.
This is a 'Dos' attack program to attack servers, you set the IP
and the port and the amount of seconds and it will start flooding to that server.
(inspire from http://hazardedit.com/forum/viewtopic.php?t=73)
Usage : ./flood_udp <ip> <port> <second>
"""
import time
import socket