⚠️ Note 2023-01-21
Some things have changed since I originally wrote this in 2016. I have updated a few minor details, and the advice is still broadly the same, but there are some new Cloudflare features you can (and should) take advantage of. In particular, pay attention to Trevor Stevens' comment here from 22 January 2022, and Matt Stenson's useful caching advice. In addition, Backblaze, with whom Cloudflare are a Bandwidth Alliance partner, have published their own guide detailing how to use Cloudflare's Web Workers to cache content from B2 private buckets. That is worth reading,
/// MIT License | |
/// | |
/// Copyright (c) 2021 Lukas Kubanek, Structured Path GmbH | |
/// | |
/// 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: |
ruby '2.7.1' | |
gem 'rails', github: 'rails/rails' | |
gem 'tzinfo-data', '>= 1.2016.7' # Don't rely on OSX/Linux timezone data | |
# Action Text | |
gem 'actiontext', github: 'basecamp/actiontext', ref: 'okra' | |
gem 'okra', github: 'basecamp/okra' | |
# Drivers |
The libdispatch is one of the most misused API due to the way it was presented to us when it was introduced and for many years after that, and due to the confusing documentation and API. This page is a compilation of important things to know if you're going to use this library. Many references are available at the end of this document pointing to comments from Apple's very own libdispatch maintainer (Pierre Habouzit).
My take-aways are:
-
You should create very few, long-lived, well-defined queues. These queues should be seen as execution contexts in your program (gui, background work, ...) that benefit from executing in parallel. An important thing to note is that if these queues are all active at once, you will get as many threads running. In most apps, you probably do not need to create more than 3 or 4 queues.
-
Go serial first, and as you find performance bottle necks, measure why, and if concurrency helps, apply with care, always validating under system pressure. Reuse
// | |
// Created by はるふ on 2017/12/11. | |
// Copyright © 2017年 ha1f. All rights reserved. | |
// | |
import Foundation | |
import CoreImage | |
import AVFoundation | |
extension CIFilter { |
Author: Chris Lattner
/// Observes a run loop to detect any stalling or blocking that occurs. | |
/// | |
/// This class is thread-safe. | |
@interface GHRunLoopWatchdog : NSObject | |
/// Initializes the receiver to watch the specified run loop, using a default | |
/// stalling threshold. | |
- (id)initWithRunLoop:(CFRunLoopRef)runLoop; | |
/// Initializes the receiver to detect when the specified run loop blocks for |
Magic words:
psql -U postgres
Some interesting flags (to see all, use -h
or --help
depending on your psql version):
-E
: will describe the underlaying queries of the\
commands (cool for learning!)-l
: psql will list all databases and then exit (useful if the user you connect with doesn't has a default database, like at AWS RDS)
UITableView convenience classes for resizing header and footer with autolayout. |