Hao ilovejs

The problem (AKA don't waste money)

One of my clients is a big company that has a very variable but predictable database usage pattern. In the weekdays morning they come up with a huge amount of INSERTs and UPDATEs while for the rest of the day, form noon on, the usage is fairly limited to a decent amount of SELECTs with very low writing activity. The smallest class type that can handle the morning's volume is db.r3.large but having such an instance running all day long and in the weekends is just a big waste of ~~resources~~ money (or a big favour we do to Amazon, from their point of view).

The solution

So I was wondering if there's some autoscaling mechanism for Aurora writers (there is, but only for replicas),

I recently happened upon a very interesting implementation of popen() (different API, same idea) called popen-noshell using clone(2), and so I opened an issue requesting use of vfork(2) or posix_spawn() for portability. It turns out that on Linux there's an important advantage to using clone(2). I think I should capture the things I wrote there in a better place. A gist, a blog, whatever.

This is not a paper. I assume reader familiarity with fork() in particular and Unix in general, though, of course, I link to relevant wiki pages, so if the unfamiliar reader is willing to go down the rabbit hole, they should be able to come ou

References:

https://github.com/tesseract-ocr/tesseract/wiki/Compiling

http://stackoverflow.com/questions/33588262/tesseract-ocr-on-aws-lambda-via-virtualenv

https://github.com/sirfz/tesserocr

Instructions for running Tesseract OCR on AWS Lambda with Python

Performance comparison of different data pipelines in .NET

Full source code can be found here

Changelog

2016-12-20
New performance test - Paul Westcott (@manofstick) made me aware that SeqComposer has a more performant API. SeqComposer2 uses this API.
2016-12-23

	{- \| An EDSL for defining and printing JSON values
	-}

	import Data.List (intercalate)

	----------------
	-- JSON Model --
	----------------

	-- \| The JSONValue data type represents a JSON Value

	'use strict';
	const Elasticsearch = require('aws-es');
	const fetch = require('node-fetch');

	const ES_SERVICE_ENDPOINT = process.env.ES_SERVICE_ENDPOINT;
	const ES_INDEX_NAME = process.env.ES_DOMAIN_NAME;

	const accessKey = process.env.ACCESS_KEY;
	const secretKey = process.env.SECRET_ACCESS_KEY;

	iOS 10.2 Simulator: https://devimages-cdn.apple.com/downloads/xcode/simulators/com.apple.pkg.iPhoneSimulatorSDK10_2-10.2.1.1484185528.dmg
	iOS 10.1 Simulator: https://devimages-cdn.apple.com/downloads/xcode/simulators/com.apple.pkg.iPhoneSimulatorSDK10_1-10.1.1.1476902849.dmg
	iOS 10.0 Simulator: https://devimages-cdn.apple.com/downloads/xcode/simulators/com.apple.pkg.iPhoneSimulatorSDK10_0-10.0.1.1474488730.dmg
	iOS 9.3 Simulator: https://devimages.apple.com.edgekey.net/downloads/xcode/simulators/com.apple.pkg.iPhoneSimulatorSDK9_3-9.3.1.1460411551.dmg
	iOS 9.2 Simulator: https://devimages.apple.com.edgekey.net/downloads/xcode/simulators/com.apple.pkg.iPhoneSimulatorSDK9_2-9.2.1.1451951473.dmg
	iOS 9.1 Simulator: https://devimages.apple.com.edgekey.net/downloads/xcode/simulators/com.apple.pkg.iPhoneSimulatorSDK9_1-9.1.1.1446593668.dmg
	iOS 9.0 Simulator: https://devimages.apple.com.edgekey.net/downloads/xcode/simulators/com.apple.pkg.iPhoneSimulatorSDK9_0-9.0.1.1443554484.dmg
	iOS 8.4 Simulator: https://devimages.a

	# after appcleaner does his magic, do this

	sudo rm -rf "/Library/Application Support/Paragon Software/"
	sudo rm /Library/LaunchDaemons/com.paragon-software.installer.plist
	sudo rm /Library/LaunchDaemons/com.paragon-software.ntfs.loader.plist
	sudo rm /Library/LaunchDaemons/com.paragon-software.ntfsd.plist
	sudo rm /Library/LaunchAgents/com.paragon-software.ntfs.notification-agent.plist
	sudo rm -rf /Library/Filesystems/ufsd_NTFS.fs/
	sudo rm -rf /Library/PrivilegedHelperTools/com.paragon-software.installer
	sudo rm -rf /Library/Extensions/ufsd_NTFS.kext/

	var sumoURL = process.env.SUMO_ENDPOINT,
	zoneID = process.env.CLOUDFLARE_ZONE_ID,
	cloudflareAuthEmail = process.env.CLOUDFLARE_AUTH_EMAIL,
	cloudflareAuthKey = process.env.CLOUDFLARE_AUTH_KEY,
	sourceCategoryOverride = process.env.SOURCE_CATEGORY_OVERRIDE \|\| 'none',
	sourceHostOverride = process.env.SOURCE_HOST_OVERRIDE \|\| 'api.cloudflare.com',
	sourceNameOverride = process.env.SOURCE_NAME_OVERRIDE \|\| zoneID;

	var https = require('https');
	var zlib = require('zlib');

	@echo off
	echo Stdout
	echo Stderr 1>&2