kkc

install graphite (http://graphite.wikidot.com) on AWS ubuntu 12.04. Fix py2cairo installation problem on virtualenv environment. Please fork and fix if you find an error.

Install Cairo

sudo apt-get install libcairo2-dev

Instally py2cairo

#git clone git://git.cairographics.org/git/py2cairo

kkc

import os
import shutil
import subprocess
import sys
import tarfile
import urllib2

LIBXML2_PREFIX = "libxml2"
LIBXSLT_PREFIX = "libxslt"
LIBXML2_FTPURL = "ftp://xmlsoft.org/libxml2/"

kkc

#!/bin/bash
# from here: http://www.codingsteps.com/install-redis-2-6-on-amazon-ec2-linux-ami-or-centos/
# and here: https://raw.github.com/gist/257849/9f1e627e0b7dbe68882fa2b7bdb1b2b263522004/redis-server
###############################################
# To use: 
# wget https://raw.github.com/gist/2776679/04ca3bbb9f085b192f6aca945120fe12d59f15f9/install-redis.sh
# chmod 777 install-redis.sh
# ./install-redis.sh
###############################################
echo "*****************************************"

kkc

Latency Comparison Numbers
--------------------------
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 4K randomly from SSD*              150,000   ns    0.15 ms

kkc

Low memory consumption with MongoDB

resouces

• http://stackoverflow.com/questions/15359271/low-memory-consumption-with-mongodb
• http://www.kchodorow.com/blog/2012/05/10/thursday-5-diagnosing-high-readahead/
• http://serverfault.com/questions/408100/mongodb-and-datasets-that-dont-fit-in-ram-no-matter-how-hard-you-shove
• http://markmail.org/message/utuxcatjdgxwe72z
• http://docs.mongodb.org/manual/administration/production-notes/#readahead
• http://linux.die.net/man/8/blockdev

kkc

http {
  log_format bodylog '$remote_addr - $remote_user [$time_local] '
      '"$request" $status $body_bytes_sent '
      '"$http_referer" "$http_user_agent" $request_time '
      '<"$request_body" >"$resp_body"';

  lua_need_request_body on;

  set $resp_body "";
  body_filter_by_lua '

kkc

via: services-engineering

Services Engineering Reading List

• A reading list for services engineering, with a focus on cloud infrastructure services
• Most content is on applied distributed systems and systems operations
• Please send suggestions to @mmcgrana or open an issue

Papers

kkc

rds-modify-db-parameter-group {param-group-name} \
--parameters="name=character_set_server, value=utf8, method=pending-reboot" \
--parameters="name=collation_server, value=utf8_general_ci, method=pending-reboot" \
--parameters="name=tmp_table_size, value={DBInstanceClassMemory/16}, method=pending-reboot" \
--parameters="name=max_heap_table_size, value={DBInstanceClassMemory/16}, method=pending-reboot" \
--parameters="name=query_cache_type, value=1, method=pending-reboot" \
--parameters="name=query_cache_size, value=131072, method=pending-reboot" \
--parameters="name=table_open_cache, value=2500, method=pending-reboot" \
--parameters="name=join_buffer_size, value={DBInstanceClassMemory/64}, method=pending-reboot" \
--parameters="name=thread_cache_size, value={DBInstanceClassMemory/12582880}, method=pending-reboot" \

kkc

前端工程師面試問題集

@版本 2.0.0

譯注：此翻譯版，主要給不能流利的讀英文的人看，相關專有名詞還是保留原文。翻譯不好地方請協助pull request.

此repository包含了一些前端開發的面試問題，來審查一個有潛力的面試者。這並不是建議你對同一個面試者問上所有的問 (那會花費好幾小時)。從列表中挑幾個題目，應該就夠幫助你審查面試者是否擁有你需要的技能。

Rebecca Murphey 的 Baseline For Front-End Developers 也是一篇很棒且值得讀的文章在你開始面試之前。

kkc

// Based on Glacier's example: http://docs.aws.amazon.com/AWSJavaScriptSDK/guide/examples.html#Amazon_Glacier__Multi-part_Upload
var fs = require('fs');
var AWS = require('aws-sdk');
AWS.config.loadFromPath('./aws-config.json');
var s3 = new AWS.S3();

// File
var fileName = '5.pdf';
var filePath = './' + fileName;
var fileKey = fileName;