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 |
Ops. https://gitlab.com': terminal prompts disabled
Ops. Username for 'https://codeberg.org':
Ops. etc
If you see this message, there is a short solution how to fix it here. In my case it appeared and it did not want to get fixed by many ways that are offered on the internet.
Some of the pieces of advice that did not work:
- Set
git config --global --add credential.helper manager
'use strict'; | |
module.exports = function CustomError(message, extra) { | |
Error.captureStackTrace(this, this.constructor); | |
this.name = this.constructor.name; | |
this.message = message; | |
this.extra = extra; | |
}; | |
require('util').inherits(module.exports, Error); |
Disclaimer: This piece is written anonymously. The names of a few particular companies are mentioned, but as common examples only.
This is a short write-up on things that I wish I'd known and considered before joining a private company (aka startup, aka unicorn in some cases). I'm not trying to make the case that you should never join a private company, but the power imbalance between founder and employee is extreme, and that potential candidates would
This article has been given a more permanent home on my blog. Also, since it was first written, the development of the Promises/A+ specification has made the original emphasis on Promises/A seem somewhat outdated.
Promises are a software abstraction that makes working with asynchronous operations much more pleasant. In the most basic definition, your code will move from continuation-passing style:
getTweetsFor("domenic", function (err, results) {
// the rest of your code goes here.
/** | |
* Simple authentication and authorization example with passport, node_acl, | |
* MongoDB and expressjs | |
* | |
* The example shown here uses local userdata and sessions to remember a | |
* logged in user. Roles are persistent all the way and applied to user | |
* after logging in. | |
* | |
* Usage: | |
* 1. Start this as server |
import static org.hamcrest.MatcherAssert.assertThat; | |
import static org.hamcrest.Matchers.equalTo; | |
import java.io.File; | |
import java.io.IOException; | |
import java.io.OutputStream; | |
import java.nio.charset.StandardCharsets; | |
import java.util.Arrays; |
mvn help:evaluate -Dexpression=project.version | grep -e '^[^\[]' |