Sergey Semyonov Slike9

Programming Achievements: How to Level Up as a Developer

This gist is part of a blog post. Check it out at:

Models	Examples
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If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

Just quick notes and code that you can play with in REPL.

	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

	http {
	proxy_cache_path /var/cache/nginx levels=1:2 keys_zone=one:8m max_size=3000m inactive=600m;
	proxy_temp_path /var/tmp;
	include mime.types;
	default_type application/octet-stream;
	sendfile on;
	keepalive_timeout 65;

	gzip on;
	gzip_comp_level 6;

	RSpec.configure do \|config\|
	config.around do \|example\|
	# For examples using capybara-webkit for example.
	# Remove this if you don't use it or anything similar
	if example.metadata[:js]
	example.run

	ActiveRecord::Base.connection.execute("TRUNCATE #{ActiveRecord::Base.connection.tables.join(',')} RESTART IDENTITY")
	else
	ActiveRecord::Base.transaction do

	--colour
	-I app