| #!/usr/bin/env bash | |
| set -Eeuo pipefail | |
| trap cleanup SIGINT SIGTERM ERR EXIT | |
| script_dir=$(cd "$(dirname "${BASH_SOURCE[0]}")" &>/dev/null && pwd -P) | |
| usage() { | |
| cat <<EOF | |
| Usage: $(basename "${BASH_SOURCE[0]}") [-h] [-v] [-f] -p param_value arg1 [arg2...] |
| <!doctype html> | |
| <html> | |
| <head> | |
| <style> | |
| html, body { | |
| font-family: -apple-system, BlinkMacSystemFont, 'Helvetica Neue', Roboto, 'Segoe UI', sans-serif; | |
| } | |
| .color-grid { | |
| display: grid; |
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.
| #!/usr/bin/env bash | |
| apt-get -y update | |
| apt-get -y install build-essential zlib1g-dev libssl-dev libxml2-dev libxslt-dev libreadline6-dev libyaml-dev | |
| # apt-get -y install libmysqlclient-dev # uncomment for mysql support | |
| cd /tmp | |
| wget http://ftp.ruby-lang.org/pub/ruby/1.9/ruby-1.9.3-p286.tar.gz | |
| tar -xvzf ruby-1.9.3-p286.tar.gz | |
| cd ruby-1.9.3-p286/ | |
| ./configure --prefix=/usr/local | |
| make |
| 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 |
