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@ndarville
ndarville / business-models.md
Last active June 13, 2025 01:26
Business models based on the compiled list at http://news.ycombinator.com/item?id=4924647. I find the link very hard to browse, so I made a simple version in Markdown instead.

Business Models

Advertising

Models Examples
Display ads Yahoo!
Search ads Google
@psychocandy
psychocandy / URI-monkey-patch.rb
Created July 17, 2012 16:11
Fix ArgumentError invalid %-encoding for malformed URLs
# The following should prevent an ArgumentError "invalid %-encoding (...%)" exception from being raised for malformed URLs.
# To use this code simply drop this in your rails app initializers.
# See: https://github.com/rack/rack/issues/337
# Taken from: http://stackoverflow.com/a/11162317/1075006
module URI
major, minor, patch = RUBY_VERSION.split('.').map { |v| v.to_i }
@jboner
jboner / latency.txt
Last active July 30, 2025 21:45
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
@jexchan
jexchan / multiple_ssh_setting.md
Created April 10, 2012 15:00
Multiple SSH keys for different github accounts

Multiple SSH Keys settings for different github account

create different public key

create different ssh key according the article Mac Set-Up Git

$ ssh-keygen -t rsa -C "[email protected]"