FWIW: I (@rondy) am not the creator of the content shared here, which is an excerpt from Edmond Lau's book. I simply copied and pasted it from another location and saved it as a personal note, before it gained popularity on news.ycombinator.com. Unfortunately, I cannot recall the exact origin of the original source, nor was I able to find the author's name, so I am can't provide the appropriate credits.
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| brew install rbenv | |
| brew install ruby-build | |
| brew install rbenv-vars | |
| brew install readline | |
| brew install ctags | |
| echo 'eval "$(rbenv init - --no-rehash)"' >> ~/.bash_profile | |
| exec $SHELL -i # reload the shell | |
| CONFIGURE_OPTS="--disable-install-doc --with-readline-dir=$(brew --prefix readline)" rbenv install 1.9.3-p194 | |
| rbenv global 1.9.3-p194 | |
| gem install bundler rbenv-rehash git-up hitch gem-browse gem-ctags cheat awesome_print pry |
| 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 |
| require 'RMagick' | |
| TOP_N = 10 # Number of swatches | |
| # Create a 1-row image that has a column for every color in the quantized | |
| # image. The columns are sorted decreasing frequency of appearance in the | |
| # quantized image. | |
| def sort_by_decreasing_frequency(img) | |
| hist = img.color_histogram | |
| # sort by decreasing frequency |