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Jens Alfke
snej
Mobile Architect at Couchbase.
Ex-Apple (iChat, Safari RSS, Java, etc.)
I like P2P, social software, cryptography, audio, languages, cool UIs, & capybaras.
This script is for shipping OS X apps outside the Mac App Store. It will run you through a comprehensive quality-control checklist, supports alpha, beta and production channels, builds the product (or re-ships a previous build to a different channel), codesigns all components with Developer ID per Apple TN2206, builds the Help Book from Markdown…
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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