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@jboner
jboner / latency.txt
Last active April 8, 2026 23:56
Latency Numbers Every Programmer Should Know
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
@qwzybug
qwzybug / build_settings.yml
Created September 8, 2011 19:35
Ruby script to build, tag, archive, and distribute an app and its dSYM file, in one fell swoop.
TF_API_TOKEN: <your TestFlight API token>
TF_TEAM_TOKEN: <your TestFlight team token>
TF_DISTRIBUTION: <name of distribution list to notify>
HOCKEY_APP_ID: <your HockeyApp public App ID>
HOCKEY_APP_TOKEN: <your HockeyApp API token>
DEVELOPER_PREFIX: <path to your developer directory, e.g., /Developer-4.2>
ARCHIVE_DIRECTORY: <path for saving archived builds>
@incanus
incanus / Xcode4TestFlightintegration.sh
Created September 1, 2011 19:12
Xcode 4 scheme Archive step Post-script for automatic TestFlight build uploading. See the blog post here: http://developmentseed.org/blog/2011/sep/02/automating-development-uploads-testflight-xcode
#!/bin/bash
#
# (Above line comes out when placing in Xcode scheme)
#
API_TOKEN=<TestFlight API token here>
TEAM_TOKEN=<TestFlight team token here>
SIGNING_IDENTITY="iPhone Distribution: Development Seed"
PROVISIONING_PROFILE="${HOME}/Library/MobileDevice/Provisioning Profiles/MapBox Ad Hoc.mobileprovision"
#LOG="/tmp/testflight.log"
@incanus
incanus / GitTagBundleVersion.sh
Created December 22, 2010 02:23
This is an Xcode build script that will automatically change your app's Info.plist CFBundleVersion string to match the latest git tag for the working copy. If you have commits beyond the last tagged one, it will append a 'd' to the number.
#/bin/sh
INFO=$( echo $PWD )/MyApp-Info
TAG=$( git describe --tags `git rev-list --tags --max-count=1` )
COMMIT=
GITPATH=/usr/bin:/usr/local/bin:/usr/local/git/bin
PATH=$PATH:$GITPATH; export PATH
if [ -z $( which git ) ]; then
echo "Unable to find git binary in \$GITPATH"
@atr000
atr000 / displayBrightness.c
Created December 12, 2010 09:57
iokit / applicationservices cli to change the display brightness
/*
display-brightness.c
gcc -o display-brightness display-brightness.c \
-framework IOKit -framework ApplicationServices
*/
#include <stdio.h>
#include <IOKit/graphics/IOGraphicsLib.h>
#include <ApplicationServices/ApplicationServices.h>
@bsneed
bsneed / NSObject-extension.m
Created August 3, 2010 23:15
performSelector reimplementation with variable number of params/types and return type.
/*
You can use this to call deprecated methods without warnings (supporting old sdk's for example)
or, you can use it in place of performSelector: where you need non-object params, or multiple
params.
ie: ...
int result = 0;
int index = 12;
NSArray *array = myArray;