tclementdev

libdispatch efficiency tips

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

ShakataGaNai

#!/usr/local/bin/python3.6
import dns.resolver
import re

def main():
    v4 = []
    v6 = []
    v4, v6 = que('_cloud-netblocks.googleusercontent.com')
    for o4 in v4:
        print(o4)

meagtan

# Finding roots of polynomials in p-adic integers using Hensel's lemma

from padic import *
from poly import *

def roots(p, poly):
    'Yield all roots of polynomial in the given p-adic integers.'
    for root in xrange(p):
        try:
            yield PAdicPoly(p, poly, root)

sindresorhus

NSVisualEffectMaterial constants, and the undocumented materials they coorespond to in various modes:
+----------------------+-------+----------+------+---------+
|      MATERIAL #      | LIGHT | LIGHT EM | DARK | DARK EM |
+----------------------+-------+----------+------+---------+
|                      |       |          |      |         |
| 0 - Appearance Based | 3     | 3        | 5    | 5       |
|                      |       |          |      |         |
| 1 - Light            | 3     | 3        | 3    | 3       |
|                      |       |          |      |         |
| 2 - Dark             | 4     | 4        | 4    | 4       |

purp

Debugging Travis CI locally using Docker

This assumes you've got docker-machine installed, running, and can do docker run

1. Get a debug instance running

    docker run --name travis-debug -dit quay.io/travisci/travis-ruby /sbin/init
    docker exec -it travis-debug bash -l

idleberg

This list has been updated for Big Sur (and later). Since I don't use these versions, this guide might still need further improvements. For older macOS versions, please see this older revision.

Open in Sublime Text

• Open Automator
• Quick Action
• Set “Service receives selected” to files or folders in any application
• Add a Run Shell Script action
• Set the script action to /Applications/Sublime\ Text.app/Contents/SharedSupport/bin/subl -n "$@"
• Set “Pass input” to as arguments

Catfish-Man

// Compile with clang -framework Foundation sethack.m

#import <Foundation/Foundation.h>
#import <objc/runtime.h>

/*
 CFHashBytes from http://www.opensource.apple.com/source/CF/CF-1153.18/CFUtilities.c
 */
#define ELF_STEP(B) T1 = (H << 4) + B; T2 = T1 & 0xF0000000; if (T2) T1 ^= (T2 >> 24); T1 &= (~T2); H = T1;

lexrus

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rabovik

/**
 * Several macros simplifying use of weak references to self inside blocks
 * which goal is to reduce risk of retain cycles.
 *
 * Example:
 * @code
 
 @interface Example : NSObject{
    int _i;
 }

erikh

#!/usr/bin/env sh

##
# This is script with usefull tips taken from:
#   https://github.com/mathiasbynens/dotfiles/blob/master/.osx
#
# install it:
#   curl -sL https://raw.github.com/gist/2108403/hack.sh | sh
#