bjaglin

#!/bin/bash

set -eu
shopt -s nullglob

readonly base_dir=/var/lib/docker/registry
readonly output_dir=$(mktemp -d -t trace-images-XXXX)
readonly jq=/usr/bin/jq

readonly repository_dir=$base_dir/repositories

mmourafiq

# -*- coding: utf-8 -*-
'''
Created on Jan 11, 2013

@author: Mourad Mourafiq

About: This is an attempt to solve the Quora challenge Feed Optimizer.
'''
import itertools
import copy

gsakkis

from binascii import hexlify, unhexlify
from hashlib import md5
from Crypto.Cipher import AES
try:
    from M2Crypto import EVP
except ImportError:
    EVP = None


def m2_encrypt(plaintext, key, iv, key_as_bytes=False, padding=True):

jboner

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

hrldcpr

One-line Tree in Python

Using Python's built-in defaultdict we can easily define a tree data structure:

def tree(): return defaultdict(tree)

That's it!

tonyc

Using strace and lsof to debug blocked processes

You can use strace on a specific pid to figure out what a specific process is doing, e.g.:

strace -fp <pid>

You might see something like:

select(9, [3 5 8], [], [], {0, 999999}) = 0 (Timeout)

pokstad

import redis
import web

SESSION = 'SESSION:'

class RedisStore(web.session.Store):

    """Store for saving a session in redis:
    import rediswebpy
    session = web.session.Session(app, rediswebpy.RedisStore(), initializer={'count': 0})