BlackHC

Latency Comparison Numbers (~2023)
----------------------------------
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 Snappy            3,000   ns        3 µs
Read 1 MB sequentially from memory      20,000   ns       20 µs          ~50GB/sec DDR5
Read 1 MB sequentially from NVMe       100,000   ns      100 µs          ~10GB/sec NVMe, 5x memory

fuxingloh

Minimal effort image storage, transformation and delivery.

IaaS

AWS: Serverless Image Handler

• Storage: You upload to S3
• Delivery + Transformation: CloudFront -> API Gateway -> Lambda (Node, Sharp/Thumbor) -> S3
• CloudFormation: 1 click and fill up some fields.
• Only predefined S3 Bucket, no dynamic bucket routing.
• Transformation is encoded into Base64 that can be generated by anyone. You can add Signed URL but it's quite troublesome.

fuxingloh

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
    let text = collections[indexPath.row].name
    let width = UILabel.textWidth(font: titleFont, text: text)
    return CGSize(width: width + left + right, height: height)
}

nicolasdao

Exhaustive list of SPDX (Software Package Data Exchange) licenses: https://spdx.org/licenses/

Table of Contents

• TL;DR - The BSD 3 Clause License Should Do
• In a Nutshell
• 3 Main Types of Open Source Licenses
  • 1. MIT
  • 2. Apache
  • 3. GPL
• The BSD License Case

calebamiles

Node.js Foundation

• Healthy Open Source
  • explicit goal to be a lightweight process
  • concrete ability to scale to hundreds of contributors
  • good fundamental goals
    • transparency
    • participation
    • efficacy
  • ecosystem projects encouraged but not required to adopt foundation governance templates
• creation of projects under TSC explicity delegates authority from TSC to project TC

fuxingloh

const express = require('express')
const SamlStrategy = require('passport-saml').Strategy
const passport = require('passport')

const cookieSession = require('cookie-session')
const cookieParser = require('cookie-parser')

// Create express instance
const app = express()

jboner

References from my talk 'Without Resilience, Nothing Else Matters'

• Drift into Failure
• How Complex Systems Fail
• Antifragile: Things That Gain from Disorder
• Leverage Points: Places to Intervene in a System
• Going Solid: A Model of System Dynamics and Consequences for Patient Safety
• Resilience in Complex Adaptive Systems: Operating at the Edge of Failure
• Puppies! Now that I’ve got your attention, Complexity Theory
• [Towards Resilient Architectures: Biology

fuxingloh

func countLabelLines(label: UILabel) -> Int {
    // Call self.layoutIfNeeded() if your view uses auto layout
    let myText = label.text! as NSString

    let rect = CGSize(width: label.bounds.width, height: CGFloat.greatestFiniteMagnitude)
    let labelSize = myText.boundingRect(with: rect, options: .usesLineFragmentOrigin, attributes: [NSAttributedStringKey.font: label.font], context: nil)

    return Int(ceil(CGFloat(labelSize.height) / label.font.lineHeight))
}

anvaka

npm rank

This gist is updated daily via cron job and lists stats for npm packages:

1. Top 1,000 most depended-upon packages
2. Top 1,000 packages with largest number of dependencies
3. Top 1,000 packages with highest PageRank score

jboner

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