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#!/usr/bin/env bash | |
# memusg -- Measure memory usage of processes | |
# Usage: memusg COMMAND [ARGS]... | |
# | |
# Author: Jaeho Shin <[email protected]> | |
# Created: 2010-08-16 | |
############################################################################ | |
# Copyright 2010 Jaeho Shin. # | |
# # | |
# Licensed under the Apache License, Version 2.0 (the "License"); # |
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require 'rake' | |
Table = Struct.new(:name, :comment, :columns, :indexes) | |
Column = Struct.new(:name, :type, :not_null, :default, :primary_key, :comment) | |
Index = Struct.new(:name, :columns, :primary, :unique) | |
def get_schema_info(klass) | |
table = Table.new | |
table.name = klass.table_name | |
table.columns = [] |
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// Use Gists to store code you would like to remember later on | |
console.log(window); // log the "window" object to the console |
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require 'rake' | |
require 'rspec/core/rake_task' | |
require 'yaml' | |
require 'highline/import' | |
properties = YAML.load_file('properties.yaml') | |
ENV['SSH_USER'] = ask("Enter ssh user: ") { |q| q.echo = true } | |
ENV['SSH_PASSWORD'] = ask("Enter ssh password: ") { |q| q.echo = false } |
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#!/usr/bin/env python | |
# -*- coding: utf-8 -*- | |
import logging | |
import sys | |
import os.path | |
import bz2 | |
from gensim.corpora import WikiCorpus | |
from gensim.corpora.wikicorpus import filterWiki |
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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 | |
Send 1K bytes over 1 Gbps network 10,000 ns 0.01 ms | |
Read 1 MB sequentially from memory 250,000 ns 0.25 ms | |
Round trip within same datacenter 500,000 ns 0.5 ms | |
Read 1 MB sequentially from SSD 1,000,000 ns 1 ms 4X memory |
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require 'rack' | |
require 'sinatra/base' | |
require 'uuidtools' | |
require 'rest-client' | |
require 'eventmachine' | |
require 'json' | |
require_relative './cache' | |
class Worker < EM::Connection | |
attr_reader :query |
#NoSQLデータモデリング技法
原文:NoSQL Data Modeling Techniques « Highly Scalable Blog
I translated this article for study. contact matope[dot]ono[gmail] if any problem.
NoSQLデータベースはスケーラビリティ、パフォーマンス、一貫性といった様々な非機能要件から比較される。NoSQLのこの側面は実践と理論の両面からよく研究されている。ある種の非機能特性はNoSQLを利用する主な動機であり、NoSQLシステムによく適用されるCAP定理がそうであるように分散システムの基本的原則だからだ。一方で、NoSQLデータモデリングはあまり研究されておらず、リレーショナルデータベースに見られるようなシステマティックな理論に欠けている。本稿で、私はデータモデリングの視点からのNoSQLシステムファミリーの短い比較といくつかの共通するモデリングテクニックの要約を解説したい。
本稿をレビューして文法を清書してくれたDaniel Kirkdorfferに感謝したいと思う
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require 'net/http' | |
require 'uri' | |
require 'json' | |
class Dozens | |
API_BASE = 'http://dozens.jp/api/' | |
ZONE_BASE = API_BASE + 'zone' | |
RECORD_BASE = API_BASE + 'record' |
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