A few notes for passing the AWS Architect Associate certification - March 2018
General purpose SSD have a maximum of 10.000 IOPS.
It is possible to detach non-root volume from running EC2 instance.
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 |
# Join multiple lines without new line | |
value: > | |
part 1 | |
part 2 | |
# Join with newline | |
value2: | | |
line 1 | |
line 2 |
# ZSH / BASH users | |
# Add this to your .env, .bashrc, .zshrc, or whatever file you're using for environment | |
man() { | |
env \ | |
LESS_TERMCAP_mb=$(printf "\e[1;31m") \ | |
LESS_TERMCAP_md=$(printf "\e[1;31m") \ | |
LESS_TERMCAP_me=$(printf "\e[0m") \ | |
LESS_TERMCAP_se=$(printf "\e[0m") \ | |
LESS_TERMCAP_so=$(printf "\e[1;44;33m") \ |
#!/bin/bash | |
# remove all blank lines in go 'imports' statements, | |
# then sort with goimports | |
if [ $# != 1 ] ; then | |
echo "usage: $0 <filename>" | |
exit 1 | |
fi | |