start new:
tmux
start new with session name:
tmux new -s myname
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 |
# Key considerations for algorithm "RSA" ≥ 2048-bit
openssl genrsa -out server.key 2048
# Key considerations for algorithm "ECDSA" ≥ secp384r1
# List ECDSA the supported curves (openssl ecparam -list_curves)
#!/bin/bash | |
# store the current dir | |
CUR_DIR=$(pwd) | |
# Let the person running the script know what's going on. | |
echo "\n\033[1mPulling in latest changes for all repositories...\033[0m\n" | |
# Find all git repositories and update it to the master latest revision | |
for i in $(find . -name ".git" | cut -c 3-); do |
Every so often I have to restore my gpg keys and I'm never sure how best to do it. So, I've spent some time playing around with the various ways to export/import (backup/restore) keys.
cp ~/.gnupg/pubring.gpg /path/to/backups/
cp ~/.gnupg/secring.gpg /path/to/backups/
cp ~/.gnupg/trustdb.gpg /path/to/backups/
Thanks to this article by Christoph Berg
Directories and files
~/
... or Why Pipelining Is Not That Easy
Golang Concurrency Patterns for brave and smart.
By @kachayev
# Initialize the scroll | |
page = es.search( | |
index = 'yourIndex', | |
doc_type = 'yourType', | |
scroll = '2m', | |
search_type = 'scan', | |
size = 1000, | |
body = { | |
# Your query's body | |
}) |
There are three easy to make mistakes in go. I present them here in the way they are often found in the wild, not in the way that is easiest to understand.
All three of these mistakes have been made in Kubernetes code, getting past code review at least once each that I know of.
What do these lines do? Make predictions and then scroll down.
func print(pi *int) { fmt.Println(*pi) }