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Article Written By:
Johann Dowa

Excellent Video Presentation For Understanding GCD


Grand Central Dispatch is a topic that I’ve mentioned a few times in the past and referencing an excellent GCD basics tutorial and this example on creating asynchronous UITableViewCell’s.

Earlier I came across an excellent video presentation that should be of great help for anyone that is still trying to understand GCD, and what they can do with it.  This is especially relevant with the iPhone 4S coming out tomorrow as it is the first iPhone with a dual-core cpu.

The presentation is from Deusty designs and covers:

– Why did Apple create Grand Central Dispatch?
– The effect of multi-core CPUs on software developers.
– Why did the Desktop industry transition to multi-core CPUs?
– Will the mobile industry follow suite?
– The effect of over-flowing the pipeline. (threads vs available cores)
– The OS imposed difficulty in properly filling the pipeline.
– Real-world benchmarks of GCD vs traditional thread pools.
– How is GCD different from traditional multi-threading solutions?
– What GCD does NOT help you with.
– Threads vs GCD queues.
– What is a block exactly?
– How does memory-management work with blocks? (primitives & objects)
– Using the basic GCD APIs.
– Using GCD to help create thread-safe classes.
– Other advanced GCD topics

You can find the presentation on the Deusty blog here. The presentation is extremely well done, straight to the point yet thorough (about 45 minutes total – great treadmill material).  If you’re new to using GCD I highly recommend it.


On another note thanks to those who have submitted tutorials they found around the net for the iOS 5 SDK tutorial and guide page.  I will check them out, and add them in the next update.  Please keep submitting.  Thanks!



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