| 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 |
Fixing up and squashing commits with rebase is great fun and handy to keep the logs clean from lots of little commits like typos, but only before a push (unless you're sure nobody else has pulled since then).
When you rebase, it re-writes all SHA values after the removed commit(s). This can be troublesome when you may have already pushed to a remote. This has serious implications for breaking the repository for collaborators.
This simple script will take a picture of a whiteboard and use parts of the ImageMagick library with sane defaults to clean it up tremendously.
The script is here:
#!/bin/bash
convert "$1" -morphology Convolve DoG:15,100,0 -negate -normalize -blur 0x1 -channel RBG -level 60%,91%,0.1 "$2"
I heard from GitHub Two-Factor Authentication](https://github.com/blog/1614-two-factor-authentication) nearly a couple of days ago when I was reading my RSS feed. I enabled it and couldn' push to any of my repositories anymore. Learn in this blog post how to fix it.
"Is a process involving two stages to verify the identity of an entity trying to access services in a computer or in a network". Github solves this authentication with sending an SMS to a device which wants to push to their platform.
| function drips(){ | |
| docker ps -q | xargs -n 1 docker inspect --format '{{ .NetworkSettings.IPAddress }} {{ .Name }}' | sed 's/ \// /' | |
| } |
| NOTE: This document is OLD - and most of the tips here are probably outdated, since newer versions of Javascript have been | |
| released over the years - with newer optimizations and more emphasis on optimizing newly supported syntax. | |
| // Array literal (= []) is faster than Array constructor (new Array()) | |
| // http://jsperf.com/new-array-vs-literal/15 | |
| var array = []; | |
| // Object literal (={}) is faster than Object constructor (new Object()) | |
| // http://jsperf.com/new-array-vs-literal/26 |
MIT License
Copyright (c) 2018 Josh Bode
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
| rabbitmqctl add_user test test | |
| rabbitmqctl set_user_tags test administrator | |
| rabbitmqctl set_permissions -p / test ".*" ".*" ".*" |
| dash_id=xxxx | |
| api_key=xxx | |
| app_key=xxx | |
| # 1. export | |
| curl -X GET "https://app.datadoghq.com/api/v1/dash/${dash_id}?api_key=${api_key}&application_key=${app_key}" > dash.json | |
| # 2. edit dash.json | |
| move "graphs", "title", "description" up one level in the json hierarchy, from being beneath "dash" to being at the same level |