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jboner / latency.txt

Last active July 29, 2025 17:15

Latency Numbers Every Programmer Should Know

	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

fred / active_admin.rb

Created May 2, 2012 08:10

extend active admin to prettier boolean values

	# It extends activeadmin to show pretty boolean values
	#
	# config/initializers/active_admin.rb

	module ActiveAdmin
	module Views
	class TableFor
	def bool_column(attribute)
	column(attribute){ \|model\| model[attribute] ? '✔'.html_safe : '✗'.html_safe }
	end

antirez / gist:917229

Created April 13, 2011 09:01