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@observerss
observerss / AioPool.md
Last active Aug 29, 2015
Gevent pool/group alike in python3 asyncio
View AioPool.md

Gevent Pool/Group Alike in Python3 Asyncio

Python3 Asyncio implements an event loop, but in quite low level, it's missing some basic helpers that can make your life a lot easier.

The Pool and Group are typical missing ones. Compare these codes below

Simple Loop

  • without group
View optimizing_python_for_scientific_computing
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@observerss
observerss / GLOW_PUZZLE.md
Last active Jan 4, 2016
glowing's job puzzle
View GLOW_PUZZLE.md
@observerss
observerss / RedisAsDB.rst
Last active Jun 4, 2019
Redis as database: dealing with indexes and composite indexes
View RedisAsDB.rst

Using Reids As Database

Redis is very performant, due to performance consideration, sometimes we need to use Redis as a database, when querying a redis database, we need to consider indexing and filtering.

Single Index

We can use SortedSet as Index.

@observerss
observerss / throttled_call.py
Created Oct 12, 2013
Python snippet that throttles a function call. This is useful when the function request a remote service that having throttling policy. We must honor the throttling, otherwise we will be banned.
View throttled_call.py
import time
from collections import deque
def throttled_call(func, args=(), kwargs={}, threshold_per_minute=60):
"""Throttling the function call with ``threshold_per_minute`` calls per minute.
This is useful when the function request a remote service that having throttling policy.
We must honor the throttling, otherwise we will be banned.
:param func: the function to be called
View matrix_traverse.py
def chop(matrix, box, direction, results=None):
if results is None:
results = []
x1, y1, x2, y2 = box
w = x2 - x1 + 1
h = y2 - y1 + 1
if w <= 0 or h <= 0:
return results
else:
if direction == 0:
View redis.markdown

Running redis using upstart on Ubuntu

I've been trying to understand how to setup systems from the ground up on Ubuntu. I just installed redis onto the box and here's how I did it and some things to look out for.

To install:

View redis-server-for-init.d-startup
#! /bin/sh
### BEGIN INIT INFO
# Provides: redis-server
# Required-Start: $syslog
# Required-Stop: $syslog
# Should-Start: $local_fs
# Should-Stop: $local_fs
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Short-Description: redis-server - Persistent key-value db
@observerss
observerss / etc-init-elasticsearch.conf
Last active Dec 19, 2015 — forked from jaytaylor/etc-init-elasticsearch.conf
elasticsearch upstart script for official deb packages (tested with 0.90.2)
View etc-init-elasticsearch.conf
# ElasticSearch Service
description "ElasticSearch"
start on (net-device-up
and local-filesystems
and runlevel [2345])
stop on runlevel [016]
respawn