NUMA, affinity and OS tuning

NUMA tuning and affinity (RHEL)
NUMA and optimization (Elasticsearch, Riak)

IRC cheat sheet

Register IRC nick

/msg NickServ REGISTER password youremail@example.com

Identify to primary IRC account:

/msg NickServ IDENTIFY account password

Get nick info

/msg NickServ INFO account

Reset password

/msg NickServ SET PASSWORD mynewpassword

Reset command hash

To flush the hash table used by the shell to remember the full path names of executable files:

hash -r

git recipes

Git: prune local branches without remotes

git branch -vv | grep ': gone]' | awk '{print $1}' | xargs git branch -D 

Cache git credentials (Linux)

While it is possible to store git credentials locally via .netrc, that requires storing them in plain text. Even with 400 permissions, it is an unnecessary risk. I have read references about using GPG for encryption within this file, which increases security, but introduces a new dependency. When changing hosts frequently, local dependencies become highly impractical. Instead, to cache the credentials in memory with an expiration timeout, one hour, for example:

git config --global credential.helper 'cache --timeout=3600'